Solvent Polarity Dependence of Photoinduced Charge Separation and Recombination Processes of Ferrocene−C60 Dyads

Autor:	Osamu Ito,† and, Yoshinori Yamamoto, Mamoru Fujitsuka, Ryo Hamasaki, Norie Tsuboya, Masateru Ito, Shinji Onodera
Rok vydání:	2003
Předmět:	Delocalized electron chemistry.chemical_compound Benzonitrile Fullerene Photoinduced charge separation Radical ion Ferrocene Chemistry Flash photolysis Physical and Theoretical Chemistry Photochemistry HOMO/LUMO
Zdroj:	The Journal of Physical Chemistry A. 107:1452-1458
ISSN:	1520-5215 1089-5639
Popis:	Photoinduced charge-separation and charge-recombination processes of the three ferrocene−C60 dyads have been investigated by using laser flash photolysis methods. From molecular orbital calculations, the HOMO states are delocalized over the ferrocene and linking phenyl-ethenyl group connecting ferrocene and C60, while the LUMO states are on C60. From short fluorescence lifetimes (≤ 120 ps) of the fullerene moieties of the dyads, charge separations were suggested. Charge-separated states in the dyads were observed upon femtosecond laser irradiation. The rate constants for the charge separation were on the order of 1010 s-1, and the quantum yields were close to unity in various solvents, such as benzonitrile, anisole, and toluene. It was confirmed that the absorption bands of the radical cation moiety shifted to longer wavelength side in polar solvents, probably due to structural change in the charge-separated states. The lifetimes of the charge-separated states of the dyads with longer linkage became longe...
Databáze:	OpenAIRE
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