2013 Fiscal Year Final Research Report
Development of pH-Sensitive Spin-Crossover Complex Film and Direct Observation of Proton Flow
| Project/Area Number |
24655115
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Functional materials chemistry
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
OKAZAWA Atsushi 東京大学, 大学院総合文化研究科, 助教 (30568275)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Keywords | スピンクロスオーバー錯体膜 / pH応答性 / イオン交換膜 / ハロクロミズム / EXAFS / XANES / プロトン流の可視化 |
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| Research Abstract |
The spin state of a pH-sensitive spin-crossover iron(II) complex in highly proton-conductive Nafion membrane, [FeII(diAMsar)]@Nafion (diAMsar = 1,8-diaminosarcophagine), was spatiotemporally manipulated by electric field-induced proton concentration gradient derived from applied voltage. [Fe(II)(diAMsar)] has the high-spin (HS) state of Fe(II) in acidic condition, whereas it has the low-spin (LS) state in basic condition due to the protonation/deprotonation of the terminal amino groups of diAMsar being associated with color change. Applied voltage reversibly induced the time-variable color change of [Fe(II)(diAMsar)]@Nafion, corresponding to the dynamical spin-crossover behavior of [Fe(II)(diAMsar)]. In this way, we visualized the proton flow in Nafion membrane by using the pH-sensitive spin-crossover complex as a color indicator for the first time.
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[Journal Article] A Tricky Water Molecule Coordinated to a Verdazyl Radical-Iron(II) Complex : a Multitechnique Approach2014
Author(s)
H. Kamebuchi, M. Okubo, A. Okazawa, M. Enomoto, J. Harada, K. Ogawa, G. Maruta, S. Takeda, N. Kojima, C. Train, M. Verdaguer
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Journal Title
Phys. Chem. Chem. Phys.
Volume: 16
Pages: 9086 - 9095
DOI
Peer Reviewed
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[Journal Article] Reversible Solid State Redox of an Octacyanometallate-bridged Coordination Polymer by Electrochemical Ion Insertion/extraction2013
Author(s)
M. Okubo, K. Kagesawa, Y. Mizuno, D. Asakura, E. Hosono, T. Kudo, H. Zhou, K. Fujii, H. Uekusa, S. Nishimura, A. Yamada, A. Okazawa, N. Kojima
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Journal Title
Inorg. Chem.
Volume: 52
Pages: 3772- 3779
DOI
Peer Reviewed
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[Journal Article] Anionic Iron Complexes with a Bond between an Ate-Type Pentacoordinated Germanium and an Iron Atom2012
Author(s)
N. Kano, N. Yoshinari, Y. Shibata, M.Miyachi, T.Kawashima, M. Enomoto,, A. Okazawa, N. Kojima, J.D.Guo, S. Nagase
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Journal Title
Organometallics
Volume: 31
Pages: 8059-8062
DOI
Peer Reviewed
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