2004 Fiscal Year Final Research Report Summary
Creation of Multifunctional Photochromic Metal Complexes
| Project/Area Number |
14204066
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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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 | The University of Tokyo |
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Principal Investigator |
NISHIHARA Hiroshi The University of Tokyo, School of Science, Department of Chemistry, Professor, 大学院・理学系研究科, 教授 (70156090)
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| Co-Investigator(Kenkyū-buntansha) |
MURATA Masaki The University of Tokyo, School of Science, Department of Chemistry, Assistant Professor, 大学院・理学系研究科, 助手 (70345263)
YONEZAWA Tetsu The University of Tokyo, School of Science, Department of Chemistry, Associate Professor, 大学院・理学系研究科, 助教授 (90284538)
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| Project Period (FY) |
2002 – 2004
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| Keywords | photochromizm / Multiple functions / transition metal complexes / bipyridine / ditiolato complex / photoelectronic conversion / optical sense / protonation |
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| Research Abstract |
This project aims at the creation of new photochromic metal complexes, the investigation of their unique multiple functionalities, and the fabrication of novel types of molecular switches and memories by organizing them at the electrode surfaces. Summary of the results obtained is as follows, 1)Azobenzene-bound tris(bipyridine)cobalt complexes and ferrocenylazobenzenes underwent novel reversible trans-cis isomerization of azobenzene moieties using the combination of photoirradiation with a single light source and redox reaction of a metal complex moiety. 2)Photoluminescence properties of azobenzene-bound terpyridine platinum complexes were turned on and off by the reversible trans-cis isomerization of the azobenzene moiety. 3)A mixture of an azobenzene-attached bipyridine ligand, dmpAB, unsubstituted bipyridine, and Cu ions underwent reversible ligand exchange reactions by redox reaction of Cu(II)/Cu(I), and consequently, trans-cis isomerization of azobenzene moieties using the combina
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tion of photoirradiation with a single light source was achieved. 4)Azo-conjugated dithiolato and catecolato complexes underwent proton-catalized cis-to-trans isomerization. 5)SAMs of azobenzene-bound metal terpyridine complexes and ferrocenylazobenzene derivatives were prepared and their photochemical reactions investigated. 6)A new "molecular photo-electro transducer", working in a cyclic manner totally powered with light irradiation, has been constructed. The UV/blue controlled repetitive motion of azobenzene moieties in 6,6'-bis(4"-tolylazo)-4,4'-bis(4-tert-butylphenyl)-2,2'-bipyridine causes reciprocal Cu(I) translocation between two coordination environments, resulting in pumping of the redox potential of Cu(I). Therefore, UV/blue light information can be successfully transformed into an electrode potential change and positive/negative current response, which is closely related to natural visual transduction both functionally and mechanically. 7)A new platinum complex with both an azo-bound dithiolato ligand and an azobenzene-bound bipyridine ligand exhibits testability reversibly controllable using different energy lights. Less
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