2005 Fiscal Year Final Research Report Summary

EFFECTS OF SOLVENT VISCOSITY ON PHOTOINDUCED ELECTRON TRANSFER REACTIONS

Research Project

Project/Area Number	16550020
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	Physical chemistry
Research Institution	KITASATO UNIVERSITY
Principal Investigator	KIKUCHI Koichi KITASATO UNIVERSITY, PHYSICS, PROFESSOR, 理学部, 教授 (10004433)
Co-Investigator(Kenkyū-buntansha)	INADA Taeko KITASATO UNIVERSITY, PHYSICS, LECTURER, 理学部, 講師 (60286375)
Project Period (FY)	2004 – 2005
Keywords	INTERMOLECULAR ELECTRON TRANSFER / FLUORESCENCE QUENCHING / EXCITED STATE / VISCOSITY EFFECT / ETHYLENE GLYCOL / METAL ION
Research Abstract	The electron-transfer (ET) fluorescence quenching of aromatic molecule and the back ET within the geminate radical ion pairs were studied in a viscous solvent (ethylene glycol) using aromatic molecules and trivalent lanthanide ions as quenchers. The present results were compared with the previous results obtained in a non-viscous solvent (acetonitrile) to make clear the effects of solvent viscosity on the ET fluorescence quenching and back ET. It was found that the rate of ET depends on the solvent viscosity only through the diffusion coefficients of electron donor and acceptor, and hence, the free energy dependence of fluorescence quenching mechanism is not affected by the solvent viscosity.

(2 results)