| Project/Area Number |
17550057
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Inorganic chemistry
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| Research Institution | Kyoto University |
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Principal Investigator |
KAWAMURA Takashi Kyoto University, Graduate School of Engineering, Parttime Researcher, 工学研究科, 非常勤研究員 (40026125)
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| Project Period (FY) |
2005 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 2006: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2005: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | Supramolecular Chemistry / Mixed valent complex / Porous coordination polymer / Conducting complex / Adsorption / Rhodium / Ruthenium / Metal-metal bond / 混合原子価錯体 / ヨウ化物イオン / 構造化学 / 機能化学 / 吸脱着 / 混合酸化状態 / 多核錯体 |
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| Research Abstract |
Conductive porous coordination polymer is an interesting material because its conductivity may shift depending on adsorbate molecules. This is an electrical transformation of molecular recognition. An important key for conductive material is presence of redox sites in mixed oxidation state. We adopted a paddlewheel type dirhodium complex as the redox active site. Its neutral and monocationic complexes are reacted with sodium iodide to give a diamondoid network material in a mixed oxidation state and it was a semiconductor with σ = 3.8 x 10^<-4> S cm^<-1> and Arrhenius activation energy of 160 meV. Electronic spectra of this and related complexes suggested that the conductance is well modeled by a small polaron mechanism with a quite small transfer interaction (β = 33 meV). When pressure increases to 2 GPa, the conductivity increased monotonically to a three times larger value than observed at the atmospheric pressure without any indication of phase-transition. Upon dehydration of the current semiconductor, the conductivity decreased orders of magnitudes. The dehydrated semiconductor adsorbs some small molecules such as CO_2, C_2H_2, CH_3OH, and CH_3CN. When the dehydrated semiconductor adsorbed CH_3OH or CH_3CN, its conductivity increased. The geometrical structure of the current complex is not very strong to execute detailed study on the adsorbate dependence of its conductivity. We also synthesized a series halide-bridged terakis(acetamidato)diruthenium chain complexes. Characteristics of these complexes are large zero-field splitting constant and small exchange interactions between neighboring diruthenium sites
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