2001 Fiscal Year Final Research Report Summary
Physical Chemistry of lonic Liquids
| Project/Area Number |
12440159
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Physical chemistry
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| Research Institution | The University of Tokyo |
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Principal Investigator |
HAMAGUCHI Hiro-o The University of Tokyo, School of Science, Professor, 大学院・理学系研究科, 教授 (00092297)
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| Co-Investigator(Kenkyū-buntansha) |
SATO Shin The University of Tokyo, School of Science, Assistant, 大学院・理学系研究科, 助手 (60313201)
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| Project Period (FY) |
2000 – 2001
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| Keywords | ionic Liquid / solvent / structure / photoisomerization / trans-stilbene |
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| Research Abstract |
Three different ionic-liquids have been synthesized; [bmim]PF_6, [bmim]BF_4, and [bmim](CF_3SO_2)_2N, where [bimim] stands for the butyhiiethylimidazolium ion. The structure of those ionic liquids has been studied by infrared and Raman spectroscopy; It has been elucidated that the [bmim] cation m [bmim]PF_6 and [bmim]BF_4 takes the same structure including the conformation of the pentyl group. The PF_6 anion in [bmim]PF_6 has been found to retain its octahedral symmetry, but its, site in [bmim]PF_6 is somewhat lower than O_h. The photophysics and photochemistry in ionic liquids have been studied by time-resolved fluorescence spectroscopy. It has been found that trans to cis isomerization of stilbene proceeds in [bmim]PF_6 even if its viscosity is about two orders of magnitude larger than that of ordinary organic solvents. This result indicates that viscosity is not a good measure of the property of an ionic liquid as a solvent.
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