Details of the Researcher

PHOTO

Wataru Kosaka
Section
Institute for Materials Research
Job title
Associate Professor
Degree

  • 博士（工学）（東京大学）

  • 修士（工学）（東京大学）

e-Rad No.
70620201
Researcher ID
P-6119-2014

Research History 4

  • 2022/06 - Present
    Tohoku University　Institute for Materials Research　Associate professor

  • 2013/08 - 2022/05
    Tohoku University　Institute for Materials Research

  • 2011/05 - 2013/07
    Kanazawa University　Institute of Science and Engineering Faculty of Chemistry

  • 2009/04 - 2011/04
    国立研究開発法人科学技術振興機構 戦略的創造研究推進事業 ERATO 北川統合細孔プロジェクト　多能性細孔グループ　研究員

Education 3

  • The University of Tokyo　The Graduate School of Engineering　Department of Applied Chemistry

    2006/04 - 2009/03

  • The University of Tokyo　The Graduate School of Engineering　Department of Applied Chemistry

    2004/04 - 2006/03

  • The University of Tokyo　The Faculty of Engineering　Department of Applied Chemistry

    - 2004/03

Committee Memberships 8

  • 錯体化学会　討論会・国際会議運営委員会

    2024/11 - Present

  • The 1st Asian Conference on Molecular Magnetism 実行委員

    2020/03 - 2021/03

  • 錯体化学若手の会　北海道・東北支部世話人

    2013/08 - 2020/03

  • 独立行政法人理化学研究所　客員研究員

    2013/08 - 2019/03

  • 43rd International Conference on Coordination Chemistry 実行委員

    2018/08 - 2018/08

  • 錯体化学会第68回討論会 実行委員

    2018/07 - 2018/07

  • 第11回分子科学討論会 実行委員

    2017/09 - 2017/09

  • 錯体化学若手の会　北陸支部世話人

    2011/05 - 2013/07

Show all ︎Show first 5

Professional Memberships 3

  • Japan Society for Molecular Science

    2017/04 - Present

  • Japan Society of Coordination Chemistry

    2009/04 - Present

  • The Chemical Society of Japan

    2004/03 - Present

Research Interests 1

  • 化学

Research Areas 2

  • Nanotechnology/Materials / Functional solid-state chemistry /

  • Nanotechnology/Materials / Inorganic and coordination chemistry /

Awards 2

  1. 第97春季年会 優秀講演賞（学術）

    2017/03/30　日本化学会　1G5-53 Gas-responsive Porous Magnet of a Layered Assembly of Paddlewheel-type Diruthenium Unit and TCNQ

  2. 第27回トーキン科学技術振興財団「トーキン財団奨励賞」

    2017/02/08　トーキン科学技術振興財団　ガス吸着と同期した電気物性制御が可能な配位高分子材料の開発

Papers 98

  1. Dynamic spin reordering in a hybrid layered ferrimagnet with intercalated biferrocenium radicals Peer-reviewed

    Qingxin Liu, Wataru Kosaka, Hitoshi Miyasaka

    Chemical Science　15　(46)　19411-19419　2024/10/30

    Publisher: Royal Society of Chemistry (RSC)

    DOI： 10.1039/d4sc04722b 　

    ISSN： 2041-6520

    eISSN： 2041-6539

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    A hybrid layered magnet with a free-spin-sandwiched structure was synthesized using biferrocenium cation [bifc]+ as the free-spin component, revealing the characteristic magnetic transition nature of the spin-sandwiched magnetic layer.

  2. CO2-actuated spin transition tuning in an interdigitated Hofmann-type coordination polymer Peer-reviewed

    Abhik Paul, Wataru Kosaka, Bhart Kumar, Dibya Jyoti Mondal, Hitoshi Miyasaka, Sanjit Konar

    Chemical Science　15　(38)　15610-15616　2024/08/30

    Publisher: Royal Society of Chemistry (RSC)

    DOI： 10.1039/d4sc04266b 　

    ISSN： 2041-6520

    eISSN： 2041-6539

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    The first example of CO2-adsorption actuated spin transition tuning in a 2D Hofmann-type framework is demonstrated, where effective spin-state stabilisation is disseminated as the CO2 occupation rate in the framework based on gating temperature.

  3. CO2-Sensitive Porous Magnet: Antiferromagnet Creation from a Paramagnetic Charge-Transfer Layered Metal–Organic Framework Peer-reviewed

    Jun Zhang, Wataru Kosaka, Qingxin Liu, Naoka Amamizu, Yasutaka Kitagawa, Hitoshi Miyasaka

    Journal of the American Chemical Society　145　(48)　26179-26189　2023/11/21

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/jacs.3c08583 　

    ISSN： 0002-7863

    eISSN： 1520-5126

  4. Densely Packed CO2 Aids Charge, Spin, and Lattice Ordering Partially Fluctuated in a Porous Metal‐Organic Framework Magnet Peer-reviewed

    Wataru Kosaka, Yoshie Hiwatashi, Naoka Amamizu, Yasutaka Kitagawa, Jun Zhang, Hitoshi Miyasaka

    Angewandte Chemie International Edition　62　(48)　e202312205　2023/10/15

    Publisher: Wiley

    DOI： 10.1002/anie.202312205 　

    ISSN： 1433-7851

    eISSN： 1521-3773

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    Partial charge fluctuations in the charge‐ordered state of a material, often triggered by structural disorders and/or defects, can significantly alter its physical characteristics, such as magnetic long‐range ordering. However, it is difficult to post‐chemically fix such accidental partial fluctuations to reconstruct a uniform charge‐ordered state. Herein, we report CO2‐aided charge ordering demonstrated in a CO2‐post‐captured layered magnet, [{Ru2(o‐ClPhCO2)4}2{TCNQ(OMe)2}]·CO2 (1⊃CO2; o‐ClPhCO2− = ortho‐chlorobenzoate; TNCQ(OMe)2 = 2,5‐dimethoxy‐7,7,8,8‐tetracyanoquinodimethane). Pristine porous layered magnet 1 had a partially charge‐fluctuated ordered state, which provided ferrimagnetic ordering at TC = 65 K. Upon loading CO2, 1 adsorbed one mole of CO2, forming 1⊃CO2, and raising TC to 100 K. This was because of the vanishing charge fluctuations without significantly changing the framework structure. This research illustrates the post‐accessible host‐guest chemistry delicately combined with charge, spin, and lattice ordering in a spongy magnet. Furthermore, it highlights how this innovative approach opens up new possibilities for technology and nanoscale magnetism manipulation.

  5. Appearance of a Photoinduced Hidden State in the Electron Donor–Acceptor Type Metal–Organic Framework (NPr4)2[Fe2(Cl2An)3] Peer-reviewed

    Samiran Banu, Mone Kato, Kou Takubo, Yoichi Okimoto, Shinya Koshihara, Kaoru Iwano, Wataru Kosaka, Hitoshi Miyasaka, Tadahiko Ishikawa

    Advanced Optical Materials　202301554　1-9　2023/09/13

    Publisher: Wiley

    DOI： 10.1002/adom.202301554 　

    ISSN： 2195-1071

    eISSN： 2195-1071

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    Abstract Electron donor–acceptor (DA)‐type metal–organic frameworks (MOFs) with valence instability are promising molecular materials for the design of photo‐responsive and electronic/magnetic functional materials. Here, ultrafast photoinduced dynamics in a DA‐type layered MOF that exhibits a charge‐transfer (CT)‐type phase transition are reported: (NPr4)2[Fe2(Cl2An)3], where NPr4+ = tetra‐n‐propylammonium and Cl2An2− = 2,5‐dichloro‐3,6‐dihydroxo‐1,4‐benzoquinonate. At room temperature (300 K: RT), ultrafast photoinduced CT between the Fe and Cl2An ions induces a sensitive change in the state associated with the valence instability from a single‐chain, electron‐correlated state to a new photoinduced, structurally modulated state. In the photoinduced state, two absorption bands are observed, one on the higher‐energy side of the CT band and the other in the mid‐IR range. This strongly implies that the local inversion center on the Cl2An ion that exists in the initial state disappears instantly upon photoexcitation, causing an ultrafast change in the lattice structure due to the softening of rigid bonds. This has never been realized in thermal excitation. These findings demonstrate that a new electronic state with a unique lattice structure—i.e., a photoinduced hidden state—appears in this MOF system at ultra‐high speed (within 110 fs) upon photoexcitation at RT.

  6. Guest-Induced Pore Breathing Controls Spin State in a Cyanido‑Bridged Framework Peer-reviewed

    Michał Magott, Klaudia Płonka, Barbara Sieklucka, Katarzyna Dziedzic-Kocurek, Wataru Kosaka, Hitoshi Miyasaka, Dawid Pinkowicz

    Chemical Science　14　(36)　9651-9663　2023/08/16

    Publisher: Royal Society of Chemistry (RSC)

    DOI： 10.1039/d3sc03255h 　

    ISSN： 2041-6520

    eISSN： 2041-6539

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    Iron(II) spin cross-over (SCO) compounds combine a thermally driven transition from the diamagnetic low spin (LS) state to the paramagnetic high-spin (HS) state with a distinct change in the crystal...

  7. Inter-layer magnetic tuning by gas adsorption in π-stacked pillared-layer framework magnets Peer-reviewed

    Wataru Kosaka, Honoka Nemoto, Kohei Nagano, Shogo Kawaguchi, Kunihisa Sugimoto, Hitoshi Miyasaka

    Chemical Science　14　(4)　791-800　2022/12/24

    Publisher: Royal Society of Chemistry (RSC)

    DOI： 10.1039/d2sc06337a 　

    ISSN： 2041-6520

    eISSN： 2041-6539

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    The magnetic phase change triggered by structural modifications involving gas adsorption was realized for the first time in a layered metal–organic framework, where the inter-layer magnetic interaction was related to the inter-layer distance.

  8. A Host–Guest Electron Transfer Mechanism for Magnetic and Electronic Modifications in a Redox‐Active Metal–Organic Framework Peer-reviewed

    Jun Zhang, Wataru Kosaka, Yasutaka Kitagawa, Hitoshi Miyasaka

    Angewandte Chemie International Edition　61　(18)　e202115976　2022/04/25

    DOI： 10.1002/anie.202115976 　

    ISSN： 1433-7851

    eISSN： 1521-3773

  9. Magnet Creation by Guest Insertion into a Paramagnetic Charge-Flexible Layered Metal–Organic Framework Peer-reviewed

    Jun Zhang, Wataru Kosaka, Hiroyasu Sato, Hitoshi Miyasaka

    Journal of the American Chemical Society　143　(18)　7021-7031　2021/05/12

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/jacs.1c01537 　

    ISSN： 0002-7863

    eISSN： 1520-5126

  10. A metal-organic framework that exhibits CO2-induced transitions between paramagnetism and ferrimagnetism Peer-reviewed

    Jun Zhang, Wataru Kosaka, Yasutaka Kitagawa, Hitoshi Miyasaka

    NATURE CHEMISTRY　13　(2)　191-199　2020/11

    DOI： 10.1038/s41557-020-00577-y 　

    ISSN： 1755-4330

    eISSN： 1755-4349

  11. CO2-induced spin state switching at room temperature in a monomeric cobalt(II) complex with the porous nature Peer-reviewed

    Manabu Nakaya, Wataru Kosaka, Hitoshi Miyasaka, Yuki Komatsumaru, Shogo Kawaguchi, Kunihisa Sugimoto, Yingjie Zhang, Masaaki Nakamura, Leonard F. Lindoy, Shinya Hayami

    Angewandte Chemie International Edition　59　(26)　10658-10665　2020/03/18

    DOI： 10.1002/anie.202003811 　

    ISSN： 1433-7851

  12. Chameleonic layered metal–organic frameworks with variable charge-ordered states triggered by temperature and guest molecules Peer-reviewed

    Jian Chen, Yoshihiro Sekine, Atsushi Okazawa, Hiroyasu Sato, Wataru Kosaka, Hitoshi Miyasaka

    Chemical Science　11　(14)　3610-3618　2020/03/04

    DOI： 10.1039/d0sc00684j 　

    ISSN： 2041-6539

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    <p>A two-dimensional honeycomb layer composed of tetraoxolene-bridged iron subunits whose charge-ordered states are multiply variable <italic>via</italic> thermal treatments and solvation/desolvation is present.</p>

  13. Host-Guest Hydrogen Bonding Varies the Charge-State Behavior of Magnetic Sponges Peer-reviewed

    Zhang Jun, Kosaka Wataru, Kitagawa Yasutaka, Miyasaka Hitoshi

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION　58　(22)　7351-7356　2019/05/27

    DOI： 10.1002/anie.201902301 　

    ISSN： 1433-7851

    eISSN： 1521-3773

  14. Magnetic Sponge Behavior via Electronic State Modulations Peer-reviewed

    Jun Zhang, Wataru Kosaka, Kunihisa Sugimoto, Hitoshi Miyasaka

    Journal of the American Chemical Society　140　5644-5652　2018/04/25

    DOI： 10.1021/jacs.8b02428 　

    ISSN： 1520-5126

  15. Gas-responsive porous magnet distinguishes the electron spin of molecular oxygen Peer-reviewed

    Wataru Kosaka, Zhaoyuan Liu, Jun Zhang, Yohei Sato, Akihiro Hori, Ryotaro Matsuda, Susumu Kitagawa, Hitoshi Miyasaka

    Nat. Commun.　9　5420(1~)-5420(～9)　2018

    DOI： 10.1038/s41467-018-07889-1 　

    ISSN： 2041-1723

  16. Magnetic Sponge with Neutral-Ionic Phase Transitions Peer-reviewed

    Kosaka, Wataru, Takahashi, Yusuke, Nishio, Masaki, Narushima, Keisuke, Fukunaga, Hiroki, Miyasaka, Hitoshi

    Advanced Science　5　(2)　1700526 (1-10)　2018

    DOI： 10.1002/advs.201700526 　

  17. In Situ Reversible Ionic Control for Nonvolatile Magnetic Phases in a Donor/Acceptor Metal-Organic Framework Peer-reviewed

    Taniguchi, Kouji, Narushima, Keisuke, Sagayama, Hajime, Kosaka, Wataru, Shito, Nanami, Miyasaka, Hitoshi

    Advanced Functional Materials　27　(5)　1604990 (1-10)　2017

    DOI： 10.1002/adfm.201604990 　

    ISSN： 1616-301X

    eISSN： 1616-3028

  18. Construction of an Artificial Ferrimagnetic Lattice by Lithium Ion Insertion into a Neutral Donor/Acceptor Metal-Organic Framework Peer-reviewed

    Taniguchi, Kouji, Narushima, Keisuke, Mahin, Julien, Kosaka, Wataru, Miyasaka, Hitoshi

    Angewandte Chemie-International Edition　55　(17)　5238-5242　2016

    DOI： 10.1002/anie.201601672 　

  19. Gate-Opening Gas Adsorption and Host-Guest Interacting Gas Trapping Behavior of Porous Coordination Polymers under Applied AC Electric Fields Peer-reviewed

    Kosaka, Wataru, Yamagishi, Kayo, Zhang, Jun, Miyasaka, Hitoshi

    Journal of the American Chemical Society　136　(35)　12304-12313　2014

    DOI： 10.1021/ja504992g 　

    ISSN： 0002-7863

  20. Self-Accelerating CO Sorption in a Soft Nanoporous Crystal Peer-reviewed

    Sato, Hiroshi, Kosaka, Wataru, Matsuda, Ryotaro, Hori, Akihiro, Hijikata, Yuh, Belosludov, Rodion V., Sakaki, Shigeyoshi, Takata, Masaki, Kitagawa, Susumu

    Science　343　(6167)　167-170　2014

    DOI： 10.1126/science.1246423 　

  21. Shape-Memory Nanopores Induced in Coordination Frameworks by Crystal Downsizing Peer-reviewed

    Sakata, Yoko, Furukawa, Shuhei, Kondo, Mio, Hirai, Kenji, Horike, Nao, Takashima, Yohei, Uehara, Hiromitsu, Louvain, Nicolas, Meilikhov, Mikhail, Tsuruoka, Takaaki, Isoda, Seiji, Kosaka, Wataru, Sakata, Osami, Kitagawa, Susumu

    Science　339　(6116)　193-196　2013

    DOI： 10.1126/science.1231451 　

  22. Carrier Concentration Dependent Conduction in Insulator-Doped Donor/Acceptor Chain Compounds Peer-reviewed

    Nishio, Masaki, Hoshino, Norihisa, Kosaka, Wataru, Akutagawa, Tomoyuki, Miyasaka, Hitoshi

    Journal of the American Chemical Society　135　(47)　17715-17718　2013

    DOI： 10.1021/ja409785a 　

  23. Selective NO Trapping in the Pores of Chain-Type Complex Assemblies Based on Electronically Activated Paddlewheel-Type [Ru-2(II,II)]/[Rh-2(II,II)] Dimers Peer-reviewed

    Kosaka, Wataru, Yamagishi, Kayo, Hori, Akihiro, Sato, Hiroshi, Matsuda, Ryotaro, Kitagawa, Susumu, Takata, Masaki, Miyasaka, Hitoshi

    Journal of the American Chemical Society　135　(49)　18469-18480　2013

    DOI： 10.1021/ja4076056 　

  24. Synthesis of trans-heteroleptic carboxylate-bridged paddlewheel-type diruthenium(II,II) complexes with poly aromatic hydrocarbon carboxylate Peer-reviewed

    Wataru Kosaka, Taku Kitayama, Tomoka Shimada, Yoshihiro Sekine, Hitoshi Miyasaka

    Chemistry Letters　54　(4)　2025/03/25

    Publisher: Oxford University Press (OUP)

    DOI： 10.1093/chemle/upaf065 　

    ISSN： 0366-7022

    eISSN： 1348-0715

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    Abstract Four trans-heteroleptic paddlewheel-type diruthenium(II,II) compounds [Ru2(RCO2)2(2,6-(CF3)2ArCO2)2(THF)2] were synthesized using 4 types of polycyclic aromatic hydrocarbon (PAH) carboxylate RCO2− together with 2,6-bis(trifluoromethyl)benzoate (2,6-(CF3)2ArCO2−) and tetrahydrofuran (THF) as axial capping ligands. The redox potential (E1/2) for [Ru2II,II]/[Ru2II,III]+ was observed in the range of 48 to 116 mV, and the HOMO energy level calculated based on the atomic coordinates of the solid-state structure was found in the narrow range of −4.31 to −4.42 eV, which was hardly affected by the PAHs introduced.

  25. Introduction of substituents for tuning the redox properties of benzoate-bridged paddlewheel diruthenium(<scp>ii</scp>,<scp>ii</scp>) complexes: what does the OH group bring? Peer-reviewed

    Wataru Kosaka, Yudai Watanabe, Taku Kitayama, Chisa Itoh, Hitoshi Miyasaka

    Dalton Transactions　54　(5)　1838-1849　2024/12/12

    Publisher: Royal Society of Chemistry (RSC)

    DOI： 10.1039/d4dt03020f 　

    ISSN： 1477-9226

    eISSN： 1477-9234

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    A series of homoleptic/heteroleptic paddlewheel diruthenium(ii,ii) complexes with hydroxybenzoate containing additional substituents such as halogens were synthesized. The substituent effects obeyed the extended Hammett's law on a unified scale.

  26. Difference in spin structure of magnetic metal-organic frameworks between cluster model and periodic system Peer-reviewed

    Naoka Amamizu, Kohei Tada, Ryohei Kishi, Wataru Kosaka, Hitoshi Miyasaka, Yasutaka Kitagawa

    Chemistry Letters　53　(12)　upae230　2024/11/29

    Publisher: Oxford University Press (OUP)

    DOI： 10.1093/chemle/upae230 　

    ISSN： 0366-7022

    eISSN： 1348-0715

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    Abstract We compare the calculated spin structures of magnetic metal-organic frameworks consisting of paddlewheel-type diruthenium complexes and tetracyano-p-quinodimethane derivatives using density functional theory calculations with Gaussian basis sets and DFT + U/plane-wave calculations under periodic conditions. The calculated results indicate that the asymmetricity of the spin density inside the [Ru2] unit disappears in the periodic systems. In addition, based on the partial spin density analysis, the electron conductivity would be switchable by changing the spin states of the metal-organic frameworks.

  27. Ultrafast Luminescence Detection with Selective Adsorption of Carbon Disulfide in a Gold(I) Metal−Organic Framework Peer-reviewed

    Haruka Yoshino, Masaki Saigo, Takumi Ehara, Kiyoshi Miyata, Ken Onda, Jenny Pirillo, Yuh Hijikata, Shinya Takaishi, Wataru Kosaka, Keni-ichi Otake, Susumu Kitagawa, Hitoshi Miyasaka

    Angewandte Chemie International Edition　2024/11/26

    Publisher: Wiley

    DOI： 10.1002/anie.202413830 　

    ISSN： 1433-7851

    eISSN： 1521-3773

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    Although a widely used and important industrial chemical, carbon disulfide (CS2) also poses a number of hazards due to its volatility and toxicity. As such, the development of multifunctional materials for the selective capture and easy recognition of CS2 is one of the crucial issues. Herein, we demonstrate completely selective CS2 adsorption among trials involving H2O, alcohols, volatile organic compounds (including thiol derivatives), N2, H2, O2, CH4, CO, NO, and CO2. We also showcase its fine detection using remarkable luminescent response in an Au(I)‐based metal−organic framework (MOF) of {ZnII(pz)[AuI(CN)2]2} (pz = pyrazine; 1) with a two‐fold interpenetration network. Ex situ single crystal X‐ray diffraction for 1 and CS2 accommodated 1 suggested that the Au···Au atoms are not only luminescent centers but also act as interaction sites for CS2 modulating the Au···Au contacts. These experiments revealed the specificity of CS2 and how changes in the CS2‐induced structure. Based on the obtained structural formation, 1 exhibited a sensitive detecting ability for CS2 with an ultrafast response time of less than 10 s. Ex situ time‐resolved photoluminescence analyses developed in this work implied that CS2 varied the energetic relaxation at the excited states related to the luminescent efficiency of the resultant MOF system.

  28. Reticular Imine‐linked Coordination Polymers Based on Paddlewheel Diruthenium/Dirhodium Nodes: Synthesis and Metal‐site Dependent Photocatalytic Reduction of CO2 Peer-reviewed

    Chisa Itoh, Masaki Kitada, Mio Kondo, Shigeyuki Masaoka, Haruka Yoshino, Wataru Kosaka, Yusuke Ootani, Junko Matsuda, Momoji Kubo, Toyohiko J. Konno, Hitoshi Miyasaka

    ChemSusChem　e202400885　1-7　2024/06/18

    Publisher: Wiley

    DOI： 10.1002/cssc.202400885 　

    ISSN： 1864-5631

    eISSN： 1864-564X

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    The paddlewheel‐type dimetal core ([M2]) is a ubiquitous motif in the nodes in coordination polymers (CPs) and metal–organic frameworks (MOFs). However, their preparation has relied on ligand‐substitution‐labile metal ions owing to challenges associated with crystallization. Consequently, examples featuring ligand‐substitution‐inert metal ions, such as Ru or Rh, are scarce. This study presents the synthesis of novel reticular imine‐linked CPs incorporating the paddlewheel‐type diruthenium(II, II) ([Ru2II,II]; 1‐Ru) or dirhodium(II, II) ([Rh2II,II]; 1‐Rh) subunits. The synthetic approach involved a Schiff base dehydration condensation reaction between p‐formylbenzoate‐bridged [Ru2II,II] or [Rh2II,II] precursors (i.e., CHO–Ru and CHO–Rh, respectively) and 2,5‐dimethyl‐1,4‐phenylenediamine in a 1:2 ratio. The catalytic activities of 1‐Ru and 1‐Rh for the photochemical reduction of CO2 in a heterogeneous system depended on the metal site. The 1‐Rusystem exhibited exceptional selectivity, generating 3.0 ´ 104 mmol g‐1 of CO after 24 h of irradiation, whereas the 1‐Rhsystem generated a lower amount of CO (3.2 ´ 103 mmol g‐1). The catalytic activity of 1‐Ru ranked with that of all relevant catalytic systems. This study paves the way for the exploration of [Ru2II,II]‐ or [Rh2II,II]‐based polymers with open metal site‐dependent functional properties.

  29. Impact of Layer Stacking Manner on the Lithium-Ion-Battery Performance in Electrically Neutral Tetraoxolene-Bridged Iron(II) Hexagonal Layer Metal–Organic Frameworks Peer-reviewed

    Wataru Kosaka, Naoki Eguchi, Taku Kitayama, Ryoma Sato, Ryosuke Nakao, Yoshihiro Sekine, Shinya Hayami, Kouji Taniguchi, Hitoshi Miyasaka

    Chemistry of Materials　36　(8)　3563-3573　2024/04/09

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acs.chemmater.3c02671 　

    ISSN： 0897-4756

    eISSN： 1520-5002

  30. Unlocking single molecule magnetism: a supramolecular strategy for isolating neutral MnIII salen-type dimer in crystalline environments Peer-reviewed

    Yuri Kyoya, Kiyonori Takahashi, Wataru Kosaka, Rui-Kang Huang, Xue Chen, Jia-bing Wu, Hitoshi Miyasaka, Takayoshi Nakamura

    Dalton Transactions　53　(17)　7517-7521　2024/04/02

    Publisher: Royal Society of Chemistry (RSC)

    DOI： 10.1039/d4dt00323c 　

    ISSN： 1477-9226

    eISSN： 1477-9234

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    In [Mn(5-MeOsalen)(Cl)]2(dibenzo[24]crown-8), dibenzo[24]-crown-8 formed a supramolecule via multi-point interactions with the [Mn(5-MeOsalen)(Cl)] dimer. The dimer was magnetically isolated with ST = 4 and weak interdimer magnetic interactions. The crystal exhibited...

  31. Post-synthetic molecular modifications based on Schiff base condensations for designing functional paddlewheel diruthenium(II, II) complexes Peer-reviewed

    Chisa Itoh, Haruka Yoshino, Taku Kitayama, Wataru Kosaka, Hitoshi Miyasaka

    Dalton Transactions　53　(2)　444-448　2023/12/04

    Publisher: Royal Society of Chemistry (RSC)

    DOI： 10.1039/d3dt03535b 　

    ISSN： 1477-9226

    eISSN： 1477-9234

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    A new synthetic route for constructing functional paddlewheel diruthenium(II,II) complexes ([Ru2II,II]) was developed by utilizing Schiff base condensation reactions of formyl-substituted benzoate-bridged [Ru2II,II] complexes with various aromatic monoamines under mild...

  32. Unprecedented highly efficient photoluminescence in a phosphorescent Ag(<scp>i</scp>) coordination polymer Peer-reviewed

    Haruka Yoshino, Masaki Saigo, Kiyoshi Miyata, Ken Onda, Jenny Pirillo, Yuh Hijikata, Wataru Kosaka, Hitoshi Miyasaka

    Chemical Communications　59　(31)　4616-4619　2023/03/06

    Publisher: Royal Society of Chemistry (RSC)

    DOI： 10.1039/d3cc00179b 　

    ISSN： 1359-7345

    eISSN： 1364-548X

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    A novel Ag-based coordination polymer with a bright phosphorescence originating from metal–metal to ligand charge transfer was synthesized. The Ag⋯Ag-related emission path and structural rigidity resulted in outstanding luminescence efficiency.

  33. The Introduction of a Base Component to Porous Organic Salts and Their CO2 Storage Capability Peer-reviewed

    Takahiro Ami, Kouki Oka, Keiho Tuchiya, Wataru Kosaka, Hitoshi Miyasaka, Norimitsu Tohnai

    CrystEngComm　25　(15)　1238-1246　2023/03/03

    Publisher: Royal Society of Chemistry (RSC)

    DOI： 10.1039/d3ce00086a 　

    eISSN： 1466-8033

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    Porous organic salts (POSs) are constructed by charge-assisted hydrogen bonding between amino and sulfonic groups, and can design a variety of porous structures based on the molecular design. In particular,...

  34. Charge Manipulation in a Series of π-Stacked Pillared-Layer Frameworks by Tuning Electron Donation Ability of Building Blocks Peer-reviewed

    Wataru Kosaka, Taku Kitayama, Chisa Itoh, Hiroki Fukunaga, Hitoshi Miyasaka

    Crystal Growth &amp; Design　23　(2)　1238-1246　2023/01/18

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acs.cgd.2c01372 　

    ISSN： 1528-7483

    eISSN： 1528-7505

  35. Considerations on Gated CO2 Adsorption Behavior in One-Dimensional Porous Coordination Polymers Based on Paddlewheel-Type Dimetal Complexes: What Determines Gate-Opening Temperatures? Peer-reviewed

    Wataru Kosaka, Jun Zhang, Yudai Watanabe, Hitoshi Miyasaka

    Inorganic Chemistry　61　(32)　12698-12707　2022/08/15

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acs.inorgchem.2c01734 　

    ISSN： 0020-1669

    eISSN： 1520-510X

  36. High Stabilization of Low Valency in a Homoleptic ortho-Hydroxybenzoate-bridged Paddlewheel Diruthenium(II,II) Complex Peer-reviewed

    Wataru Kosaka, Yudai Watanabe, Chisa Itoh, Hitoshi Miyasaka

    Chemistry Letters　51　(7)　731-734　2022/07/05

    Publisher: The Chemical Society of Japan

    DOI： 10.1246/cl.220195 　

    ISSN： 0366-7022

    eISSN： 1348-0715

  37. Syntheses, Structures, and Properties of Coordination Polymers with 2,5-Dihydroxy-1,4-Benzoquinone and 4,4′-Bipyridyl Synthesized by In Situ Hydrolysis Method Peer-reviewed

    Daiki Yamazui, Kaiji Uchida, Shohei Koyama, Bin Wu, Hiroaki Iguchi, Wataru Kosaka, Hitoshi Miyasaka, Shinya Takaishi

    ACS Omega　7　(22)　18259-18266　2022/06/07

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acsomega.1c07077 　

    ISSN： 2470-1343

    eISSN： 2470-1343

  38. Role of intramolecular hydrogen bonding in the redox chemistry of hydroxybenzoate-bridged paddlewheel diruthenium(ii,ii) complexes Peer-reviewed

    Wataru Kosaka, Yudai Watanabe, Kinanti Hantiyana Aliyah, Hitoshi Miyasaka

    Dalton Transactions　51　(1)　85-94　2022/01

    Publisher: Royal Society of Chemistry (RSC)

    DOI： 10.1039/d1dt03791a 　

    ISSN： 1477-9226

    eISSN： 1477-9234

    More details Close

    Redox studies for <italic>trans</italic>-heteroleptic paddlewheel diruthenium(<sc>ii</sc>,<sc>ii</sc>) complexes with various hydroxy-substituted benzoate revealed that the <italic>o</italic>-positioned OH group derives an effective electron-withdrawing effect, owing to intramolecular hydrogen bonding.

  39. Tunable Synchronicity of Molecular Valence Tautomerism with Macroscopic Solid‐Liquid Transition by Molecular Lattice Engineering Peer-reviewed

    Mayumi Chida, Satoru Takahashi, Ryunosuke Konishi, Takeshi Matsumoto, Akinobu Nakada, Masanori Wakizaka, Wataru Kosaka, Hitoshi Miyasaka, Ho‐Chol Chang

    Chemistry – A European Journal　27　(66)　16354-16366　2021/10/19

    Publisher: Wiley

    DOI： 10.1002/chem.202103090 　

    ISSN： 0947-6539

    eISSN： 1521-3765

  40. Ionicity Diagrams for Electron-Donor and -Acceptor Metal–Organic Frameworks: DA Chains and D2A Layers Obtained from Paddlewheel-Type Diruthenium(II,II) Complexes and Polycyano-Organic Acceptors Peer-reviewed

    Yoshihiro Sekine, Masaki Nishio, Tomoka Shimada, Wataru Kosaka, Hitoshi Miyasaka

    Inorganic Chemistry　60　(5)　3046-3056　2021/03/01

    DOI： 10.1021/acs.inorgchem.0c03335 　

    ISSN： 0020-1669

    eISSN： 1520-510X

  41. Guest-selective and reversible magnetic phase switching in a pseudo-pillared-layer porous magnet Peer-reviewed

    Haruka Yoshino, Narumi Tomokage, Akio Mishima, Benjamin Le Ouay, Ryo Ohtani, Wataru Kosaka, Hitoshi Miyasaka, Masaaki Ohba

    Chemical Communications　57　(42)　5211-5214　2021

    DOI： 10.1039/d1cc01526e 　

    ISSN： 1359-7345

    eISSN： 1364-548X

  42. Coordination distortion induced water adsorption in hydrophobic flexible metal–organic frameworks Peer-reviewed

    Yoshinobu Kamakura, Arata Hikawa, Hirofumi Yoshikawa, Wataru Kosaka, Hitoshi Miyasaka, Daisuke Tanaka

    Chemical Communications　56　(64)　9106-9109　2020/07/16

    DOI： 10.1039/d0cc03772a 　

    ISSN： 1359-7345

    eISSN： 1364-548X

  43. Magnetic Correlation Engineering in Spin‐Sandwiched Layered Magnetic Frameworks Peer-reviewed

    Hiroki Fukunaga, Wataru Kosaka, Honoka Nemoto, Kouji Taniguchi, Shogo Kawaguchi, Kunihisa Sugimoto, Hitoshi Miyasaka

    Chemistry – A European Journal　26　(70)　16755-16766　2020/07/10

    Publisher: Wiley

    DOI： 10.1002/chem.202002588 　

    ISSN： 0947-6539

    eISSN： 1521-3765

  44. Molecular motion in the nanospace of MOFs upon gas adsorption investigated by in situ Raman spectroscopy Peer-reviewed

    Shinpei Kusaka, Yasuaki Nakajima, Akihiro Hori, Akira Yonezu, Kienta Kikushima, Wataru Kosaka, Yunsheng Ma, Ryotaro Matsuda

    Faraday Discussions　225　70-83　2020

    DOI： 10.1039/d0fd00002g 　

    ISSN： 1364-5498

    More details Close

    <p>Molecular motions taking place in the nanospace of metal–organic frameworks (MOFs) are an interesting research subject, although not yet fully investigated. In this work, we utilized in situ Raman spectroscopy...</p>

  45. Control of Gas Sorption Gate-opening in Solid Solutions of One-dimensional Coordination Polymers Peer-reviewed

    Jun Zhang, Wataru Kosaka, Hitoshi Miyasaka

    Chemistry Letters　48　(11)　1308-1311　2019/11/05

    DOI： 10.1246/cl.190557 　

    ISSN： 1348-0715

  46. Water-vapor Sensitive Spin-state Switching in an Iron(III) Complex with Nucleobase Pendants Making Flexible Hydrogen-bonded Networks Peer-reviewed

    Kagesawa Koichi, Ichikawa Yuki, Iguchi Hiroaki, Breedlove Brian K, Li Zhaoyang, Yamashita Masahiro, Okazawa Atsushi, Kosaka Wataru, Miyasaka Hitoshi

    CHEMISTRY LETTERS　48　(10)　1221-1224　2019/10

    DOI： 10.1246/cl.190532 　

    ISSN： 0366-7022

    eISSN： 1348-0715

  47. In Situ Tracking of Dynamic NO Capture through a Crystal-to-Crystal Transformation from a Gate-Open-Type Chain Porous Coordination Polymer to a NO-Adducted Discrete Isomer Peer-reviewed

    Jun Zhang, Wataru Kosaka, Susumu Kitagawa, Masaki Takata, Hitoshi Miyasaka

    Chemistry - A European Journal　25　(12)　3020-3031　2019/02/26

    DOI： 10.1002/chem.201805833 　

    ISSN： 0947-6539

  48. Strong electronic influence of equatorial ligands on frontier orbitals in paddlewheel dichromium(ii,ii) complexes Peer-reviewed

    Po-Jung Huang, Yoshiki Natori, Yasutaka Kitagawa, Yoshihiro Sekine, Wataru Kosaka, Hitoshi Miyasaka

    Dalton Transactions　48　908-914　2019

    DOI： 10.1039/c8dt04347g 　

    ISSN： 1477-9234

    More details Close

    <p>The HOMO/LUMO energy levels of paddlewheel [Cr2(RCO2)4(THF)2] complexes are effectively tuned by the substitution of the equatorial RCO2− ligands.</p>

  49. One-Dimensional Chains of Paddlewheel-Type Dichromium(II,II) Tetraacetate Complexes: Study of Electronic Structure Influenced by σ- and π-Donation of Axial Linkers Peer-reviewed

    Po-Jung Huang, Yoshiki Natori, Yasutaka Kitagawa, Yoshihiro Sekine, Wataru Kosaka, Hitoshi Miyasaka

    Inorganic Chemistry　57　5371-5379　2018/05/07

    DOI： 10.1021/acs.inorgchem.8b00352 　

    ISSN： 1520-510X

  50. Hammett-law Correlation in the Electron-donation Ability oftrans-Heteroleptic Benzoate-bridged Paddlewheel-type Diruthenium(II,II) Complexes Peer-reviewed

    Yoshihiro Sekine, Kinanti H. Aliyah, Tomoka Shimada, Jun Zhang, Wataru Kosaka, Hitoshi Miyasaka

    Chemistry Letters　47　693-696　2018/05/05

    DOI： 10.1246/cl.180155 　

    ISSN： 1348-0715

  51. Layered ferrimagnets constructed from charge-transferred paddlewheel [Ru2] units and TCNQ derivatives: the importance of interlayer translational distance in determining magnetic ground state Peer-reviewed

    Wataru Kosaka, Zhaoyuan Liu, Hitoshi Miyasaka

    Dalton Transactions　47　11760-11768　2018

    DOI： 10.1039/c8dt01566j 　

    ISSN： 1477-9234

    More details Close

    <p>In D2A-type layered magnets composed of paddlewheel-type diruthenium(<sc>ii</sc>,<sc>ii</sc>) complexes and TCNQ derivatives, is it a ferrimagnet or an antiferromagnet?</p>

  52. Magnetic Switching by the In Situ Electrochemical Control of Quasi-Spin-Peierls Singlet States in a Three-Dimensional Spin Lattice Incorporating TTF-TCNQ Salts Peer-reviewed

    Fukunaga, Hiroki, Tonouchi, Masanori, Taniguchi, Kouji, Kosaka, Wataru, Kimura, Shojiro, Miyasaka, Hitoshi

    Chemistry-a European Journal　24　(17)　4294-4303　2018

    DOI： 10.1002/chem.201704815 　

  53. Metamagnetism with T-N=97 K in a layered assembly of paddlewheel [Ru-2] units and TCNQ: an empirical rule for interlayer distances determining the magnetic ground state Peer-reviewed

    Kosaka, Wataru, Itoh, Masahisa, Miyasaka, Hitoshi

    Materials Chemistry Frontiers　2　(3)　497-504　2018

    DOI： 10.1039/c7qm00534b 　

  54. Three dimensional porous Hofmann clathrate [(MPtII)-Pt-II(CN)(4)](infinity) (M = Co, Ni) synthesized by using postsynthetic reductive elimination Peer-reviewed

    Okamura, Takuro, Wu, Bin, Iguchi, Hiroaki, Breedlove, Brian K., Yamashita, Masahiro, Kosaka, Wataru, Miyasaka, Hitoshi, Takaishi, Shinya

    Chemical Communications　53　(48)　6512-6515　2017

    DOI： 10.1039/c7cc01766a 　

    ISSN： 1359-7345

    eISSN： 1364-548X

  55. Syntheses, structures and magnetic properties of tetranuclear cubane-type and heptanuclear wheel-type nickel(II) complexes with 3-methoxysalicylic acid derivatives Peer-reviewed

    Kobayashi, Fumiya, Ohtani, Ryo, Teraoka, Saki, Kosaka, Wataru, Miyasaka, Hitoshi, Zhang, Yingjie, Lindoy, Leonard F., Hayami, Shinya, Nakamura, Masaaki

    Dalton Transactions　46　(26)　8555-8561　2017

    DOI： 10.1039/c7dt01757j 　

    ISSN： 1477-9226

    eISSN： 1477-9234

  56. Gate-open-type Sorption in a Zigzag Paddlewheel Ru Dimer Chain Compound with a Phenylenediamine Linker Instructed by a Preliminary Structural Change of Desolvation Peer-reviewed

    Dou, Changxiao, Kosaka, Wataru, Miyasaka, Hitoshi

    Chemistry Letters　46　(9)　1288-1291　2017

    DOI： 10.1246/cl.170509 　

    ISSN： 0366-7022

    eISSN： 1348-0715

  57. Magneto-ionic phase control in a quasi-layered donor/acceptor metal-organic framework by means of a Li-ion battery system Peer-reviewed

    Taniguchi, Kouji, Narushima, Keisuke, Yamagishi, Kayo, Shito, Nanami, Kosaka, Wataru, Miyasaka, Hitoshi

    Japanese Journal of Applied Physics　56　(6)　060307 (1-4)　2017

    DOI： 10.7567/JJAP.56.060307 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  58. Built-in TTF-TCNQ charge-transfer salts in pi-stacked pillared layer frameworks Peer-reviewed

    Sekine, Yoshihiro, Tonouchi, Masanori, Yokoyama, Taiga, Kosaka, Wataru, Miyasaka, Hitoshi

    Crystengcomm　19　(17)　2300-2304　2017

    DOI： 10.1039/c7ce00492c 　

    ISSN： 1466-8033

  59. Regulation of NO Uptake in Flexible Ru Dimer Chain Compounds with Highly Electron Donating Dopants Peer-reviewed

    Zhang, Jun, Kosaka, Wataru, Fukunaga, Hiroki, Kitagawa, Susumu, Takata, Masaki, Miyasaka, Hitoshi

    Inorganic Chemistry　55　(22)　12085-12092　2016

    DOI： 10.1021/acs.inorgchem.6b02349 　

  60. trans-Heteroleptic carboxylate-bridged paddlewheel diruthenium(II, II) complexes with 2,6-bis(trifluoromethyl)benzoate ligands Peer-reviewed

    Sekine, Yoshihiro, Kosaka, Wataru, Kano, Hirohisa, Dou, Changxiao, Yokoyama, Taiga, Miyasaka, Hitoshi

    Dalton Transactions　45　(17)　7427-7434　2016

    DOI： 10.1039/c6dt00569a 　

  61. Fully Electron-Transferred Donor/Acceptor Layered Frameworks with TCNQ(2-) Peer-reviewed

    Kosaka, Wataru, Morita, Takaumi, Yokoyama, Taiga, Zhang, Jun, Miyasaka, Hitoshi

    Inorganic Chemistry　54　(4)　1518-1527　2015

    DOI： 10.1021/ic502513p 　

  62. The effect of chlorine and fluorine substitutions on tuning the ionization potential of benzoate-bridged paddlewheel diruthenium(II, II) complexes Peer-reviewed

    Kosaka, Wataru, Itoh, Masahisa, Miyasaka, Hitoshi

    Dalton Transactions　44　(17)　8156-8168　2015

    DOI： 10.1039/c5dt00505a 　

  63. A charge-disproportionate ordered state with delta=0.75 in a chemically sensitive donor/acceptor D(2)(delta+)A(2 delta-) layered framework Peer-reviewed

    Fukunaga, Hiroki, Yoshino, Takafumi, Sagayama, Hajime, Yamaura, Jun-ichi, Arima, Taka-hisa, Kosaka, Wataru, Miyasaka, Hitoshi

    Chemical Communications　51　(37)　7795-7798　2015

    DOI： 10.1039/c5cc01633a 　

  64. Electron-Transferred Donor/Acceptor Ferrimag net with T-C=91 K in a Layered Assembly of Paddlewheel [Ru-2] Units and TCNQ Peer-reviewed

    Kosaka, Wataru, Fukunaga, Hirold, Miyasaka, Hitoshi

    Inorganic Chemistry　54　(20)　10001-10006　2015

    DOI： 10.1021/acs.inorgchem.5b01776 　

  65. Microporous structures having phenylene fin: Significance of substituent groups for rotational linkers in coordination polymers Peer-reviewed

    Matsuda, Ryotaro, Kosaka, Wataru, Kitaura, Ryo, Kubota, Yoshiki, Takata, Masaki, Kitagawa, Susumu

    Microporous and Mesoporous Materials　189　2014

    DOI： 10.1016/j.micromeso.2013.10.029 　

  66. Highly proton conductive nanoporous coordination polymers with sulfonic acid groups on the pore surface Peer-reviewed

    Ramaswamy, Padmini, Matsuda, Ryotaro, Kosaka, Wataru, Akiyama, George, Jeon, Hyung Joon, Kitagawa, Susumu

    Chemical Communications　50　(9)　1144-1146　2014

    DOI： 10.1039/c3cc47980c 　

  67. Doping Effect in Three-dimensional Donor-Acceptor Magnet: Percolated Magnetic Pathways Dominated by Local Electron Transfers Peer-reviewed

    Fukunaga, Hiroki, Kosaka, Wataru, Miyasaka, Hitoshi

    Chemistry Letters　43　(4)　541-543　2014

    DOI： 10.1246/cl.131119 　

    ISSN： 0366-7022

    eISSN： 1348-0715

  68. Coordination Programming in the Design of Porous Coordination Polymers: Tuning of the Electronic Activity of Frameworks for Selective Nitrogen Monoxide Trapping Peer-reviewed

    Kosaka, Wataru, Yamagishi, Kayo, Matsuda, Ryotaro, Kitagawa, Susumu, Takata, Masaki, Miyasaka, Hitoshi

    Chemistry Letters　43　(6)　890-892　2014

    DOI： 10.1246/cl.140190 　

    ISSN： 0366-7022

    eISSN： 1348-0715

  69. CO2 superabsorption in a paddlewheel-type Ru dimer chain compound: gate-open performance dependent on inter-chain interactions Peer-reviewed

    Kosaka, Wataru, Yamagishi, Kayo, Yoshida, Hiroki, Matsuda, Ryotaro, Kitagawa, Susumu, Takata, Masaki, Miyasaka, Hitoshi

    Chemical Communications　49　(16)　1594-1596　2013

    DOI： 10.1039/c2cc36153a 　

  70. Polyoxometalate-based frameworks with a linker of paddlewheel diruthenium(II, III) complexes Peer-reviewed

    Hashikawa, Akihiro, Sawada, Yuki, Yamamoto, Yuma, Nishio, Masaki, Kosaka, Wataru, Hayashi, Yoshihito, Miyasaka, Hitoshi

    Crystengcomm　15　(24)　4852-4859　2013

    DOI： 10.1039/c3ce40426a 　

  71. Donor/acceptor neutral aggregation of a paddlewheel-type [Ru-2(II,II)] complex and TCNQ Peer-reviewed

    Kosaka, Wataru, Ishii, Yudai, Miyasaka, Hitoshi

    Polyhedron　52　(52)　1213　2013

    DOI： 10.1016/j.poly.2012.06.040 　

  72. Axial-Site Modifications of Paddlewheel Diruthenium(II, II) Complexes Supported by Hydrogen Bonding Peer-reviewed

    Kosaka, Wataru, Yamamoto, Naoto, Miyasaka, Hitoshi

    Inorganic Chemistry　52　(17)　9908-9914　2013

    DOI： 10.1021/ic401030r 　

  73. Inclusion and dielectric properties of a vinylidene fluoride oligomer in coordination nanochannels Peer-reviewed

    Yanai, Nobuhiro, Uemura, Takashi, Kosaka, Wataru, Matsuda, Ryotaro, Kodani, Tetsuhiro, Koh, Meiten, Kanemura, Takashi, Kitagawa, Susumu

    Dalton Transactions　41　(14)　4195-4198　2012

    DOI： 10.1039/c2dt11891b 　

  74. An ionicity diagram for the family of [{Ru-2(CF3CO2)(4)}(2)(TCNQR(x))] (TCNQR(x) = R-substituted 7,7,8,8-tetracyano-p-quinodimethane) Peer-reviewed

    Nakabayashi, Keita, Nishio, Masaki, Kubo, Keiko, Kosaka, Wataru, Miyasaka, Hitoshi

    Dalton Transactions　41　(20)　6072-6074　2012

    DOI： 10.1039/c2dt30365e 　

  75. Honeycomb frameworks with a very large mesh of 39 x 29 angstrom diameters stabilized by pi-stacked coronene molecules Peer-reviewed

    Nozaki, Tomonori, Kosaka, Wataru, Miyasaka, Hitoshi

    Crystengcomm　14　(17)　5398-5401　2012

    DOI： 10.1039/c2ce25806d 　

  76. Inorganic Frameworks Made by Combining Paddle-wheel Diruthenium(II, III) Complexes and Polyoxometalate Clusters Peer-reviewed

    Sawada, Yuki, Yamamoto, Yuma, Nishio, Masaki, Kosaka, Wataru, Hayashi, Yoshihito, Miyasaka, Hitoshi

    Chemistry Letters　41　(3)　212-214　2012

    DOI： 10.1246/cl.2012.212 　

  77. Coulombic Aggregations of Mn-III salen-Type Complexes and Keggin-Type Polyoxometalates: Isolation of Mn-2 Single-Molecule Magnets Peer-reviewed

    Sawada, Yuki, Kosaka, Wataru, Hayashi, Yoshihito, Miyasaka, Hitoshi

    Inorganic Chemistry　51　(8)　4824-4824　2012

    DOI： 10.1021/ic300215q 　

  78. Humidity-Sensitive Magnet Composed of a Cyano-Bridged Co-II-Nb-IV Dimetallic Assembly Peer-reviewed

    Imoto, Kenta, Takahashi, Daisuke, Tsunobuchi, Yoshihide, Kosaka, Wataru, Arai, Michio, Tokoro, Hiroko, Ohkoshi, Shin-ichi

    European Journal of Inorganic Chemistry　(26)　4079-4082　2010

    DOI： 10.1002/ejic.201000720 　

  79. Charge transfer processes in cyano-bridged transition metals Peer-reviewed

    Hayato Kamioka, Yutaka Moritomo, Wataru Kosaka, Shin-Ichi Ohkoshi

    PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 6, NO 1　6　(1)　116-+　2009

    DOI： 10.1002/pssc.200879843 　

    ISSN： 1862-6351

  80. Vanadium Octacyanoniobate-Based Magnet with a Curie Temperature of 138 K Peer-reviewed

    Kosaka, Wataru, Imoto, Kenta, Tsunobuchi, Yoshihide, Ohkoshi, Shin-ichi

    Inorganic Chemistry　48　(11)　4604-4606　2009

    DOI： 10.1021/ic9001576 　

  81. Magnetization-induced second harmonic generation in a three-dimensional manganese octacyanoniobate-based pyroelectric ferrimagnet Peer-reviewed

    Tsunobuchi, Yoshihide, Kosaka, Wataru, Nuida, Tomohiro, Ohkoshi, Shin-ichi

    Crystengcomm　11　(10)　2051-2053　2009

    DOI： 10.1039/b906778g 　

  82. Three-dimensional Nickel(II) Heptacyanomolybdate(III)-based Magnet Peer-reviewed

    Tomono, Keisuke, Tsunobuchi, Yoshihide, Nakabayashi, Koji, Kosaka, Wataru, Matsuda, Tomoyuki, Ohkoshi, Shin-ichi

    Chemistry Letters　38　(8)　810-811　2009

    DOI： 10.1246/cl.2009.810 　

  83. Extremely Gradual Spin-Crossover Phenomenon in a Cyano-Bridged Fe-Mo Bimetallic Assembly Peer-reviewed

    Kosaka, Wataru, Tokoro, Hiroko, Matsuda, Tomoyuki, Hashimoto, Kazuhito, Ohkoshi, Shin-ichi

    Journal of Physical Chemistry C　113　(35)　15751-15755　2009

    DOI： 10.1021/jp902735v 　

  84. Tetrapotassium heptacyanidomolybdate(III) dihydrate Peer-reviewed

    Nakabayashi, Koji, Tomono, Keisuke, Tsunobuchi, Yoshihide, Kosaka, Wataru, Ohkoshi, Shin-ichi

    Acta Crystallographica Section E-Structure Reports Online　65　(11)　I79-U201　2009

    DOI： 10.1107/S1600536809039336 　

  85. Dynamics of charge-transfer pairs in the cyano-bridged Co(2+)-Fe(3+) transition-metal compound Peer-reviewed

    Kamioka, H., Moritomo, Y., Kosaka, W., Ohkoshi, S.

    Physical Review B　77　(18)　180301　2008

    DOI： 10.1103/PhysRevB.77.180301 　

  86. Observation of an iron(II) spin-crossover in an iron octacyanoniobate-based magnet Peer-reviewed

    Arai, Michio, Kosaka, Wataru, Matsuda, Tomoyttki, Ohkoshi, Shin-ichi

    Angewandte Chemie-International Edition　47　(36)　6885-6887　2008

    DOI： 10.1002/anie.200802266 　

  87. Three-dimensional manganese octacyanoniobate-based pyroelectric ferrimagnet Peer-reviewed

    Kosaka, Wataru, Hashimoto, Kazuhito, Ohkoshi, Shin-ichi

    Bulletin of the Chemical Society of Japan　81　(8)　992-994　2008

    DOI： 10.1246/bcsj.81.992 　

  88. Charge-transfer dynamics in cyano-bridged M-A-Fe system (M-A = Mn, Fe, and Co) Peer-reviewed

    Kamioka, Hayato, Moritomo, Yutaka, Kosaka, Wataru, Ohkshi, Shinichi

    Journal of the Physical Society of Japan　77　(9)　093710　2008

    DOI： 10.1143/JPSJ.77.093710 　

  89. Poly[[diaquahexa-mu-cyanido-dicyanidodil-pyrimidine-dimanganese(II) molybdate(IV)]trihydrate] Peer-reviewed

    Kosaka, Wataru, Hashimoto, Kazuhito, Ohkoshi, Shin-Ichi

    Acta Crystallographica Section E-Structure Reports Online　63　(5)　M1220-M1222　2007

    DOI： 10.1107/S1600536807012263 　

  90. Crystal structure, magnetic properties, and second harmonic generation of a three-dimensional pyroelectric cyano-bridged Mn-Mo complex Peer-reviewed

    Kosaka, Wataru, Nuida, Tomohiro, Hashimoto, Kazuhito, Ohkoshi, Shin-ichi

    Bulletin of the Chemical Society of Japan　80　(5)　960-962　2007

    DOI： 10.1246/bcsj.80.960 　

  91. Piezomagnetic behavior of the spin crossover Prussian blue analogue CsFe[Cr(CN)(6)] Peer-reviewed

    Papanikolaou, Dionisis, Kosaka, Wataru, Margadonna, Serena, Kagi, Hiroyuki, Ohkoshi, Shin-ichi, Prassides, Kosmas

    Journal of Physical Chemistry C　111　(22)　8086-8091　2007

    DOI： 10.1021/jp068885+ 　

  92. Substitution effects of barium and calcium on magnetic properties of A(x)Sr(1-x)(Fe(0.5)Ru(0.5))O(3) double perovskites (x=0.05, A=Ba,Ca) Peer-reviewed

    Nomura, K., Zboril, R., Tucek, J., Kosaka, W., Ohkoshi, S., Felner, I.

    Journal of Applied Physics　102　(1)　013907　2007

    DOI： 10.1063/1.2751101 　

  93. Cyano-bridged gadolinium-tungstate bimetallic one-dimensional chains with a dimethylacetamide ligand Peer-reviewed

    Kosaka, Wataru, Hashimoto, Kazuhito, Ohkoshi, Shin-ichi

    Bulletin of the Chemical Society of Japan　80　(12)　2350-2356　2007

    DOI： 10.1246/bcsj.80.2350 　

  94. X-ray illumination induced Fe(II) spin crossover in the Prussian blue analogue cesium iron hexacyanochromate Peer-reviewed

    Papanikolaou, D, Margadonna, S, Kosaka, W, Ohkoshi, S, Brunelli, M, Prassides, K

    Journal of the American Chemical Society　128　(25)　8358-8363　2006

    DOI： 10.1021/ja061650r 　

  95. Synthesis and superparamagnetic property of a Co-Cr Prussian blue analogue nanoparticles inside Nafion membrane Peer-reviewed

    Kosaka, Wataru, Tozawa, Masanori, Hashimoto, Kazuhito, Ohkoshi, Shin-ichi

    Inorganic Chemistry Communications　9　(9)　920-922　2006

    DOI： 10.1016/j.inoche.2006.05.032 　

  96. Observation of an Fe(II) spin-crossover in a cesium iron hexacyanochromate Peer-reviewed

    Kosaka, W, Nomura, K, Hashimoto, K, Ohkoshi, SI

    Journal of the American Chemical Society　127　(24)　8590-8591　2005

    DOI： 10.1021/ja050118l 　

  97. Synthesis of ferromagnetic CsCuCr Prussian blue analogue with a tetragonal structure Peer-reviewed

    Kosaka, W, Ishihara, T, Yashiro, H, Taniguchi, Y, Hashimoto, K, Ohkoshi, S

    Chemistry Letters　34　(9)　1278-1279　2005

    DOI： 10.1246/cl.2005.1278 　

  98. Colored magnetic films composed of cyano-bridged metal assemblies and magneto-optical functionalities

    Nuida, T, Hozumi, T, Kosaka, W, Sakurai, S, Ikeda, S, Matsuda, T, Tokoro, H, Hashimoto, K, Ohkoshi, S

    Polyhedron　24　(16-17)　2901-2905　2005

    DOI： 10.1016/j.poly.2005.08.023 　

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Misc. 5

  1. Functional Control of MOF by External Stimulus

    Wataru Kosaka

    76　(9)　656-656　2023/09

  2. Isolation and magnetism of Mn-salen dimers with Dibenzo[24]crown-8

    京谷悠里, 高橋仁徳, 高橋仁徳, 高坂亘, HUANG Rui-Kang, HUANG Rui-Kang, XUE Chen, XUE Chen, WU Jiabing, WU Jiabing, 宮坂等, 中村貴義, 中村貴義

    錯体化学会討論会講演要旨集　73rd　2023

  3. 21aYD-4 Observation of the transient absorption spectra in M-Fe cyanides (M=Mn, Fe, Co)

    Kamioka H., Nakada F., Moritomo Y., Kosaka W., Ohkoshi S.

    Meeting abstracts of the Physical Society of Japan　63　(2)　636-636　2008/08/25

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  4. 23pYH-12 Observation of the initial charge transfer processes in Co-Fe cyanide complexes through femtosecond transient absorption spectroscopy

    Kamioka H., Nakada F., Moritomo Y., Kosaka W., Ohkoshi S.

    Meeting abstracts of the Physical Society of Japan　63　(1)　704-704　2008/02/29

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  5. 27aXQ-9 Observation of Fe spin crossover in CsFeCr Prussian blue

    Ohkoshi S., Kosaka W., Hashimoto K.

    Meeting abstracts of the Physical Society of Japan　60　(1)　724-724　2005/03/04

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

Books and Other Publications 3

  1. PCP/MOFおよび各種多孔質材料の作り方、使い方、評価解析

    技術情報協会

    技術情報協会　2019/10

    ISBN: 9784861047695

  2. Molecular magnetic materials : concepts and applications

    Sieklucka, Barbara, Pinkowicz, Dawid

    Wiley-VCH　2017/01/17

    ISBN: 3527339531

  3. ナノ空間材料ハンドブック : ナノ多孔性材料、ナノ層状物質等が切り開く新たな応用展開

    徐, 強, 有賀, 克彦

    NTS　2016/02

    ISBN: 9784860434335

Presentations 61

  1. Control of the Long-Range Magnetic Ordering via Gas Adsorption in a pi-stacked Pillared Layer Framework Invited

    Wataru Kosaka, Honoka Nemoto, Hitoshi Miyasaka

    The 8th Asian Conference on Coordination Chemistry　2022/08/09

  2. Control of the Long-Range Magnetic Ordering via Gas Adsorption in a Layered Metal-Organic Framework Composed of Paddlewheel-type Diruthenium Unit and TCNQ

    Wataru Kosaka, Jun Zhang, Hitoshi Miyasaka

    Pacifichem 2021　2021/12/19

  3. Control of the Long-Range Magnetic Ordering via Gas Adsorption in a pi-stacked Pillared Layer Framework

    Wataru Kosaka, Honoka Nemoto, Hitoshi Miyasaka

    The 1st Asian Conference on Molecular Magnetism On line　2021/03/08

  4. 酸素分子の電子スピンを見分ける多孔性配位高分子磁石 Invited

    高坂 亘

    日本結晶学会令和元年(2019年）度年会　2019/11/20

  5. Gas-responsive Porous Magnet of a Layered Assembly of Paddlewheel-type Diruthenium Unit and TCNQ International-presentation Invited

    Wataru Kosaka, Zhaoyuan Liu, Jun Zhang, Hitoshi Miyasaka

    43rd International Conference on Coordination Chemistry (ICCC2018)　2018/07/30

  6. 水車型Ru二核金属錯体とTCNQ誘導体からなる多孔性層状磁石の磁気ガス応答性

    高坂 亘, 刘 朝远, 張 俊, 宮坂 等

    第11回分子科学討論会(東北大学）　2017/09/15

  7. Gas-responsive Porous Magnet of a Layered Assembly of Paddlewheel-type Diruthenium Unit and TCNQ

    KOSAKA, Wataru, LIU, Zhaoyuan, ZHANG, Jun, MIYASAKA, Hitoshi

    日本化学会 第97春季年会（2017）　2017/03/16

  8. Selective guest adsorption and electric/magnetic functionality on redox-active coordination frameworks composed of paddlewheel-type Ruthenium dimer International-presentation Invited

    Wataru Kosaka

    1st Japan-Australia Joint Symposium on Coordination Chemistry (Joint sympsium with Post-ICMM symposium: State of the Art in Bistable Magnetic Molecules)（Fukuoka Univ.)　2016/09/08

  9. CO2-actuated Control of Fe(II) Spin Crossover in a Hofmann-type Metal-Organic Framework

    Wataru Kosaka, Abhik Paul, Bhart Kumar, Dibya Jyoti Mondal, Hitoshi Miyasaka, Sanjit Konar

    2025/03/29

  10. ガス応答性多孔性磁石

    高坂 亘

    分子スピン若手研究会（仮称）準備会　2024/12/05

  11. Hydrocarbon-Adsorption-Induced Spin-State Switching in a Monomeric Cobalt(II) Complex with the Porous Nature

    Wataru Kosaka, Manabu Nakaya, Shinya Hayami, Hitoshi Miyasaka

    2024/09/18

  12. Magnetic phases associated with structural disorders controlled by gas-adsorption in a layered [Ru2]-TCNQ framework

    Wataru Kosaka, Yoshie Hiwatashi, Hitoshi Miyasaka

    3rd Asian Conference on Molecular Magnetism (ACMM III)　2024/09/04

  13. Gated-CO2 Adsorption in 1D Porous Coordination Polymers of Phenazine-Linked Paddlewheel Diruthenium Complexes

    Wataru Kosaka, Hitoshi Miyasaka

    Pre-Asian Conference on Molecular Magnetism　2024/08/30

  14. 物質吸着による相転移制御に基づく機能性分子材料の創製

    高坂亘

    第146回金属材料研究所講演会　2024/05/28

  15. CO2-Sensitive Porous Magnet: Antiferromagnet Creation from a Paramagnetic Charge-Transfer Layered Coordination Framework

    Wataru KOSAKA, Jun ZHANG, Qingxin LIU, Naoka AMAMIZU, Yasutaka KITAGAWA, Hitoshi MIYASAKA

    The 104th CSJ Annual Meeting　2024/03/21

  16. Magnetic phases associated with structural disorders controlled by gas-adsorption in a layered [Ru2]-TCNQ framework

    Wataru Kosaka, Yoshie Hiwatashi, Hitoshi Miyasaka

    Phase Transition and Dynamical Properties of Spin Transition Materials 2023 (PDSTM2023)　2023/11/29

  17. Creation of Gas-Responsive Porous Magnet

    Wataru Kosaka, Hitoshi Miyasaka

    Summit of Materials Science 2023 and GIMRT User Meeting 2023　2023/11/20

  18. Acetylene Adsorption-Induced Magnetic Modulation in a Layered Ferrimagnet Composed of Paddlewheel-Type [Ru2] unit and TCNQ

    Wataru Kosaka, Hitoshi Miyasaka

    2023/09/21

  19. Creation of Porous Magnet Realizing Concerted Responses between Gas Adsorption and Magnetic Phase Transition Invited

    Wataru Kosaka

    GP-Chem Kickoff Symposium　2023/09/06

  20. Consideration on Gated CO2 Adsorption Behavior in One-Dimensional Porous Coordination Polymers of Phenazine-Linked Paddlewheel diruthenium complex

    Wataru Kosaka, Jun Zhang, Hitoshi Miyasaka

    2023/03/24

  21. A Host-Guest Electron Transfer Mechanism for Magnetic and Electronic Modifications in a Redox-Active Metal-Organic Framework

    Wataru Kosaka, Jun Zhang, Yasutaka, Kitagawa, Hitoshi Miyasaka

    2022/09/27

  22. ヒドロキシ基置換安息香酸架橋水車型ルテニウム二核金属錯体の合成および酸化還元特性における分子内水素結合の影響

    高坂亘, 渡辺 祐大, 宮坂等

    第102回日本化学会春季年会　2022/03/25

  23. Creation of Porous Magnet Realizing Concerted Responses between Gas Adsorption and Magnetic Phase Transition Invited

    Wataru Kosaka

    The 4th workshop of the Reaction Inforgraphy (R-ing) Unit　2021/11/04

  24. Flexible tuning of the electronic state by chemical doping in a one-dimensional chain frameworks showing neutral-ionic phase transition

    Wataru Kosaka, Du Yinan, Hitoshi Miyasaka

    2020/03/25

  25. Construction of porous magnets realizing synergistic responses of gas adsorption and magnetic phase transition Invited

    Wataru Kosaka

    2nd Advanced Material Chemistry Workshop　2019/06/15

  26. Gas-Responsive Porous Magnet Distinguishes the Electron Spin of Molecular Oxygen

    Wataru Kosaka, Jun Zhang, Hitoshi Miyasaka

    Japan Adsorption 2019（International Conference Hall, Makuhari Messe, Chiba, Japan）　2019/05/22

  27. Control of long-range magnetic ordering via gas adsorption in a π-stacked pillared layer Framework

    KOSAKA, Wataru, NAGANO, Kohei, MIYASAKA, Hitoshi

    日本化学会 第99春季年会 （甲南大学 岡本キャンパス）　2019/03/16

  28. An Empirical Rule for Interlayer Distances Determining the Magnetic Ground State in a Layered Magnet of Paddlewheel-type Diruthenium Unit and TCNQ

    高坂 亘, 伊藤真久, 宮坂等

    日本化学会 第98春季年会(日本大学理工学部（船橋キャンパス））　2018/03/20

  29. Direct regulation of the magnetic ordering via oxygen adsorption in a layered mental-organic framework magnet International-presentation

    Wataru Kosaka, Zhaoyuan Liu, Jun Zhang, Hitoshi Miyasaka

    Kick-off Symposium for World Leading Research Centers -Materials Science and Spintronics- 2018（仙台国際センター）　2018/02/20

  30. 酸化還元活性を持つ配位結合骨格における 特異的ゲスト吸着と電気・磁気機能性

    KOSAKA Wataru

    錯体化学若手の会 東北支部第九回勉強会（山形大学小白川キャンパス）　2017/10/28

  31. Ru二核錯体とTCNQ誘導体の層状集積からなるガス応答性多孔性磁石

    高坂 亘, 刘 朝远, 張 俊, 宮坂 等

    第2回固体化学フォーラム研究会　2017/06/13

  32. in situ Magnetic and Dielectric Monitoring of Selective NO Adsorption from a Gate-Open-Type Chain Bundle to an No-Adducted Isomers International-presentation

    Wataru Kosaka, Jun Zhang, Yoshihiro Sekine, Kouji Taniguchi, Hitoshi Miyasaka

    The 15th International Conference on Molecule-Based Magnets(ICMM2016), Sendai International Center, Sendai, Japan　2016/09/04

  33. Electric responses on gas adsorption processes in a porous paddlewheel-type ruthenium dimer chain compounds International-presentation

    2015 International Chemical Congress of Pacific Basin Societies (Pacifichem)　2015/12/15

  34. Dielectric responses on gate-opening adsorption behavior in paddlewheel-type Ru dimer chains

    錯体化学会第65回討論会　2015/09/21

  35. Gate-Opening Gas Adsorption and Host-Guest Interacting Gas Trapping Behavior of Porous Coordination Polymers under Applied AC Electric Fields Solid-State Metal-Complex Chemistry

    第128回東北大学金属材料研究所所内講演会　2015/05/29

  36. Selective NO Adsorption in the Electronically Activated International-presentation Invited

    HeKKSaGOn University Consortium The 4th German-Japanese University Presidents' Conference " Building Venues for the creation of new knowledge and values"　2015/04/16

  37. Selective NO Adsorption in Electronically Activated Coordination Frameworks International-presentation

    (MOF2014) 4th International Conference on Metal-Organic Frameworks and Open Framework Compounds　2014/09/28

  38. 多孔性鎖状錯体における細孔形状・酸化還元活性の違いによるNO吸着特性制御

    錯体化学会第64回討論会　2014/09/18

  39. 気体吸蔵能を示すPaddlewheel型Ru(II, II)二核鎖状錯体における交流電場応答

    日本化学会第94春季年会　2014/03/27

  40. 電子的に活性な配位結合フレームワークを用いた特異的NO 吸着

    第126回東北大学金属材料研究所所内講演会（東北大学金研）　2013/11/28

  41. Paddlewheel型Ru(II,II)二核鎖状錯体における特異的NO吸着

    高坂亘, 山岸佳世, 林宜仁, 宮坂等

    第93回日本化学会春季年会　2013/03

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    立命館大学びわこ・くさつキャンパス

  42. Guest Molecule Responsive Dielectric Properties of Porous Coordination Polymers Having Organic Dipolar Rotors International-presentation

    Wataru Kosaka, Ryotaro Matsuda, Susumu Kitagawa

    MOF 2012, Edinburgh, UK　2012/09

  43. Dielectric Response of 3-D Metal-Organic Jungle Gym-like Open Frameworks International-presentation Invited

    Wataru Kosaka, Ryotaro Matsuda, Susumu Kitagawa

    60th Anniversary Conference on Coordination Chemistry in OSAKA, Osaka, Japan　2010/09

  44. Crystal Structure and Dielectric Property of Porous Coordination Polymers Having Rotational Organic Modules International-presentation

    Wataru Kosaka, Ryotaro Matsuda, Susumu Kitagawa

    MOF 2010, Marseille, France　2010/09

  45. 電気双極子ローターを導入した多孔性配位高分子の構造及び誘電特性

    高坂亘, 松田亮太郎, 北川進

    第90回日本化学会春季年会　2010/03

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    近畿大学本部キャンパス

  46. Co2[Nb(CN)8]強磁性体における湿度誘起磁化消失現象

    高坂亘, 新井道朗, 大越慎一

    第89回日本化学会春季年会　2009/03

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    日本大学理工学部船橋キャンパス

  47. Observation of an Iron(II) Spin-Crossover in an Iron Octacyanoniobate-based Magnet International-presentation

    11th International conference of molecule-based magnets 2008, Florence, Italy　2008/09

  48. Synthesis ofCyano-bridged Nanoparticles inside Nafion Membrane International-presentation

    Wataru Kosaka, Kazuhito Hashimoto, Shin-ichi Ohkoshi

    International Conference Recent Optical Materials, Tokyo, Japan　2008/04

  49. FeII-[MoIV(CN)8]-(3-pyridinemethanol)錯体におけるFe(II)スピン転移の観測

    高坂亘, 野村貴美, 橋本和仁, 大越慎一

    第88回日本化学会春季年会　2008/03

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    立教大学池袋キャンパス

  50. シアノ架橋型金属錯体におけるFe(II)スピンクロスオーバーの研究

    高坂亘, 橋本和仁, 大越慎一

    第9回メスバウアー分光研究会シンポジウム　2008/03

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    東京大学本郷キャンパス

  51. Synthesis of Pyroelectric MnII-[NbIV(CN)8] Ferrimagnet International-presentation

    Wataru Kosaka, Kazuhito Hashimoto, Shin-ichi Ohkoshi

    Phase transition and Dynamical properties of Spin Transition Materials 2008, Bordeaux, France　2008/01

  52. Mn-[Nb(CN)8]系強磁性体の合成と非線形光学効果

    高坂亘, 橋本和仁, 大越慎一

    第57回錯体化学討論会　2007/09

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    名古屋工業大学

  53. Mn-[Nb(CN)8]-(pyrazine)焦電性フェリ磁性体の合成と磁気特性

    高坂亘, 橋本和仁, 大越慎一

    第87回日本化学会春季年会　2007/03

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    関西大学千里山キャンパス

  54. Fe(II) Spin-Crossover and Ferromagnetic Phase Transition in a CsFe[Cr(CN)6] Prussian Blue Analogue International-presentation

    Wataru Kosaka, Kiyoshi Nomura, Kazuhito Hashimoto, Shin-ichi Ohkoshi

    Phase transition and Dynamical properties of Spin Transition Materials 2006, Tokyo, Japan　2006/11

  55. 非反転対称構造を持つオクタシアノ金属錯体の磁気特性と非線形光学効果

    高坂亘, 縫田知宏, 橋本和仁, 大越慎一

    第56回錯体化学討論会　2006/09

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    広島大学東千田キャンパス

  56. Octacyanometallate-based one- and three-dimensional complexes with a noncentrosymmetric structure International-presentation

    Wataru Kosaka, Tomohiro Nuida, Kazuhito Hashimoto, Shin-ichi Ohkoshi

    10th International conference of molecule-based magnets 2006, Victoria, Canada　2006/08

  57. Observation of a spin crossover transition on Fe(II) in a cesium iron hexacyanochromate International-presentation

    Wataru Kosaka, Kazuhito Hashimoto, Shin-ichi Ohkoshi

    Pacifichem 2005, Honolulu, USA　2005/12

  58. CsFeCrプルシアンブルー類似体におけるFe(II)スピンクロスオーバーの観測

    高坂亘, 野村貴美, 横山利彦, 橋本和仁, 大越慎一

    第55回錯体化学討論会　2005/09

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    朱鷺メッセ（新潟）

  59. CsFe[Cr(CN)6]強磁性体におけるスピンクロスオーバーの観測

    高坂亘, 橋本和仁, 大越慎一

    日本化学会第85春季年会　2005/03

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    神奈川大学横浜キャンパス

  60. Synthesis of cyanide-bridged superparamagnetic nanoparticles International-presentation

    Wataru Kosaka, Kazuhito Hashimoto, Shin-ichi Ohkoshi

    36th International Conference of Coordination Chemistry, Merida, Mexico　2004/07

  61. 超常磁性を示すシアノ架橋型金属錯体ナノ微粒子の合成

    高坂亘, 大越慎一, 橋本和仁

    日本化学会第84春季年会　2004/03

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    関西学院大学西宮上ヶ原キャンパス

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Research Projects 11

  1. na

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Nagoya University

    2022/04 - 2026/03

  2. Conversion of magnetic and electrical properties of coordination polymer magnets by a combined external field of light and guest adsorption

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2021/04 - 2025/03

  3. キラリティー可変な多孔性配位高分子磁石の創製

    高坂 亘

    Offer Organization: 公益財団法人 野口研究所

    System: 2020年度（第12回）野口遵研究助成金

    Category: 2020年度（第12回）野口遵研究助成金

    2021/04 - 2022/03

  4. 多孔性配位高分子磁石によるガス応答性磁気光学材料の開拓

    高坂 亘

    Offer Organization: 公益財団法人 住友財団

    System: 基礎科学研究助成

    Category: 多孔性配位高分子磁石によるガス応答性磁気光学材料の開拓

    2020/11 - 2021/10

  5. Creation of Porous Magnet Realizing Concerted Responses between Gas Adsorption and Magnetic Phase Transition

    Kosaka Wataru

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    2018/04/01 - 2021/03/31

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    The primal objectives of this study, "creation of a series of compounds of porous coordination polymer magnets" and "reversible control of the long-range magnetic order by gas adsorption/desorption" have been achieved. Through this study, the magnetic response of layered porous magnet upon guest adsorption via various mechanisms were clarified. Especially, ON/OFF-switching of magnet using “electronic spin of oxygen” is one of the great achievements. In addition, the fact that carbon dioxide, one of the most common gases around us, can also be used for ON/OFF-switching of magnet is unexpected and surprising result. Useful techniques and knowledge in future research on phase transition phenomena, such as the method of single crystal structure analysis under controlled atmosphere and the cooperation with quantum chemistry calculation based on the obtained crystal structure etc., were established.

  6. 多重安定性を備えた配位高分子磁石の合成と化学ドープによる相制御

    高坂 亘

    Offer Organization: 公益財団法人 池谷科学技術振興財団

    System: 2020年度 単年度研究助成

    Category: 多重安定性を備えた配位高分子磁石の合成と化学ドープによる相制御

    2020/04 - 2021/03

  7. Design of porous conductive molecular magnets establishing synergistic reversibility between chemical stimuli and physical properties

    Miyasaka Hitoshi, Kosaka Wataru

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Tohoku University

    2016/04/01 - 2019/03/31

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    The research project aimed to design molecular lattice compounds that undergo drastic changes of their physical properties such as electronic conductivity and magnetism due to the influence of chemical stimuli. The chemical stimuli were assumed as insertion/extraction of guest molecules such as solvent molecules and ubiquitous gas molecules, for which porous conductive magnets with lattice frameworks were rationally established based on the previous studies. Focusing on lattices that undergo the dynamical change of charge ordered state derived by a small modulation of structures, charge-flexible lattices were, in particular, synthesized by tuning HOMO/LUMO energy levels of electron-donor/-acceptor building units. Consequently, some characteristic materials such as magnetic sponges undergoing electronic modulations or porous magnets distinguishing electron spins of oxygen molecules were established.

  8. Selective Guest Absorption and Electronic/Magnetic Functionality on Redox-active Coordination Frameworks

    KOSAKA Wataru

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

    Category: Grant-in-Aid for Young Scientists (B)

    Institution: Tohoku University

    2014/04/01 - 2017/03/31

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    For coordination frameworks, where paddlewheel type diruthenium(II,II) complex as an electron donor is bridged by organic linker, selective gas adsorption toward active gas, and gas-adsorption-induced electric/magnetic property modulation are expected due to electronic interaction between gas and framework. To demonstrate them, we designed and developed the measurement systems for structural, magnetic and electric properties of coordination frameworks under controlled atmosphere and temperature, which revealed that the gas-induced structural change and electronic interaction between gas and framework can be detected as electric/magnetic signal. Especially, significant enhancement of the electric conductivity under nitric oxide (NO) gas was demonstrated.

  9. Control of synergistically working multi-functions designed in conductive molecular magnets

    MIYASAKA Hitoshi, KOSAKA Wataru

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Tohoku University

    2012/04/01 - 2015/03/31

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    The aim of the research project is to establish multi-functional molecular materials using electron-donor/-acceptor-based conductive molecular magnets or highly redox-active molecular framework compounds, in which not only ‘physical responses’ such as magnetic ordering, electron transporting, and dielectric responses resulted from their frameworks, but also ‘chemical reactions’ involving chemical adsorption/desorption of gaseous molecules in nano-sized pores are synergistically functioned. We discovered tunable selective NO adsorption behavior in a series of electron-donor-type chain compounds based on paddlewheel-type diruthenium(II, II) complexes, and succeeded to capture modifications involving gas adsorptions as gate-opening gas adsorption transitions and chemical interactions caused by host-guest interactions as electric signals by applying ac electric fields in situ gas handling.

  10. Design and Synthesis of Ferroelectric Porous Coordination Polymer toward the Development of Functional Dielectric Adsorbent

    KOSAKA Wataru

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

    Category: Grant-in-Aid for Young Scientists (B)

    2012/04/01 - 2014/03/31

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    One of the striking features of porous coordination polymers is their flexibility inside pores. It is well known that organic molecule shows high mobility when no steric hindrance exists around them, and in PCP, enough space for organic ligand to mobile is available because of its porous nature. In this study, we tried to develop novel dielectric materials controlled by gas adsorption, in which molecular motion accompanied with gas adsorption can be detected as electric signals. It was revealed from the dielectric measurement for several frameworks that the compounds showing structural phase transition synchronized with gas adsorption, i.e., gate-opening, are promising material for dielectric materials controlled by gas adsorption.

  11. シアノ架橋型金属錯体を用いた分子磁性体の合成と,新規磁気・電気・光学機能性

    高坂 亘

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 特別研究員奨励費

    Category: 特別研究員奨励費

    Institution: 東京大学

    2007 - 2008

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    1.新規Fe(II)スピンクロスオーバー錯体,FeII2[MoIV(CN)8](3-pyridylmethanol)8・3H2Oを合成した.本錯体は立方晶系の高い対称性を持ち,FeとMoがシアノ基で架橋された三次元の結晶構造を持つ.本錯体は広い温度範囲に渡るながらかなFe(II)スピンクロスオーバーを示し,その温度変化はボルツマン分布に従う場合と比較してもなおなだらかであった.平均場近似による解析の結果,観測されたなだらかな転移は,ハイスピン(hs)Feサイトと,ロースピン(ls)鉄サイトが三次元に交互に配列(-hs-ls-hs-ls-)していることからの帰結であることが示唆された.このような交互配列を誘起する相互作用が本系で支配的だったのは,FeIIサイトが立方晶という高い対称性のもとで,シアノ錯体を介し共有結合で直接結びつけられており,転移サイト間に大きな相互作用が働くため,転移に伴う体積変化が誘起する弾性的相互作用が三次元方向に等方的に伝播するためだからだと考えられる.このような交互配列は本系において初めて示唆された現象であり,新しい形の転移現象として重要な知見を与えるものと考えられる.また本研究からの展開として,反磁性の[MoIV(CN)8]4-を常磁性構築素子である[NbIV(CN)8]4-に置換した系の合成にも成功しており,その結果,これまでに1例しか報告されていない,強磁性とFe(II)スピンクロスオーバーを共存させることにも成功している. 2.焦電性フェリ磁性体,[{MnII(pyrazine)(H2O)2}{MnII(H2O)2}{NbIV(CN)8}]・4H2Oを合成することに成功した.本錯体は48Kにおいてフェリ磁性相へと転移し,またa軸方向に磁化容易軸を持つ.また,結晶構造はb軸方向に自発電気分極(P)を持つ三次元構造を有しており,第二高調波(SHG)活性な化合物である.SHGの温度依存性について検討を行ったところ,90K以下の温度領域において,趙常磁性に起因するなだらかなSH強度の増加がみられ,磁気相転移温度(48K)付近からは自発磁化の発現に伴うSH強度の急激な増加が観測された.本系は大きな非線形磁気光学効果を示す材料であり,その他にも,磁気物性と誘電物性の交差相関を検討する上で,重要な化合物であると期待される. 3.我々はこれまでに,陽イオン交換膜Nafion中にシアノ架橋型金属錯体微粒子が分散した透明複合膜を報告しているが(W.Kosaka et al.Inorg.Chem.Commun.9,920(2006).),その高い透明性が各種分光測定,特に時間分解分光測定に有利である.シアノ架橋型金属錯体の中には,興味深い光誘起電荷移動現象などを示すものがいくつか知られているが,本研究で得られたナノ微粒子薄膜を利用した分光測定によって,その電荷移動プロセスについて,多くの有用な知見が得られている.

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Teaching Experience 5

  1. Inorganic Chemistry IA　Tohoku University

  2. Exercises in Inorganic and Analytical Chemistry B　Tohoku University

  3. Chemistry Experiments A　Tohoku University

  4. Material science experiment B　Kanazawa University

  5. Information Processing Practice　Kanazawa University

Social Activities 11

  1. 酸素に反応する磁石～吸脱着でオン・オフ制御～

    化学工業日報

    2019/01/30 - 2019/01/30

  2. 磁石になる電池開発

    2017/01/26 -

  3. 新庄中学校の宮坂研究室見学

    2016/11/01 -

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    新庄中学校の宮坂研究室見学

  4. インドネシア大学 副学長 所内・宮坂研究室見学 (同行 工学研究科副研究科長)

    2016/04/01 -

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    インドネシア大学 副学長 所内見学 (同行 工学研究科副研究科長)

  5. 宮城県 古川学園中学校 研究所見学

    2016/03/08 -

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    宮城県 古川学園中学校 研究所見学

  6. 青森県 八戸北高校の研究所見学

    2015/08/07 -

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    青森県 八戸北高校の研究所見学

  7. 3次元格子の分子磁石を設計 多機能性磁性体開発にも期待

    2015/01/09 -

  8. 有機分子で永久磁石 ～東北大、従来より強力

    2014/12/22 -

  9. ビルのような分子磁石の設計が有効か

    2014/12/17 -

  10. 「ピラードレイヤー構造」の分子磁性体/東北大・宮坂等教授らが開発に成功、困難な3D構造実現に新しいアプローチ

    2014/12/02 -

  11. Magnet Made of Paddle wheels and Pillars

    2014/12/01 -

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