| Project/Area Number |
20750041
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Inorganic chemistry
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| Research Institution | University of Tsukuba |
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Principal Investigator |
NIHEI Masayuki University of Tsukuba, 大学院・数理物質科学研究科, 講師 (00359572)
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| Project Period (FY) |
2008 – 2009
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| Project Status |
Completed (Fiscal Year 2009)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2009: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2008: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | 電子移動 / 外場応答 / 多重安定性 / 物性変換 |
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| Research Abstract |
Mixed-valence heterometal complexes are good candidates for a system exhibiting entropy-driven electron transfer, because the electron transfer associates relatively large structural changes. In this study, tetranuclear molecular squares with various substituent groups, [Fe^<III>_2Co^<II>_2(CN)_6(L1)_2(L2)_4] (L1 and L2 are multi-dentate ligands), were prepared. The molecular squares exhibited spin transition between HS ([Fe^<III>_<LS>(S=1/2)Co^<II>_<HS>(S=3/2)]) and LS ([Fe^<II>_<LS> (S=0)Co^<III>_<LS>(S=0)]) states induced by thermal intramolecular electron transfer. The intramolecular electron transfer can be controlled by chemical modification, where electron donating groups on the ligands modified the redox potentials of metal ions, leading to fine tuning of spin transition temperatures. In addition, protonation to terminal nitrogen atoms of cyanide lead to a novel protonation-induced spin transition between LS and HS states.
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