著者

Naotaka SAGA Yoshifumi KIMURA Masahide TERAZIMA Noboru HIROTA

出版者

The Japan Society for Analytical Chemistry

雑誌

Analytical Sciences/Supplements

巻号頁・発行日

pp.s234-s236, 2002 (Released:2007-03-13)

著者

Hirofumi Nakamura Masahide Terazima Noboru Hirota Satoshi Nakajima Atsuhiro Osuka

出版者

(社)日本化学会

雑誌

Bulletin of the Chemical Society of Japan (ISSN:00092673)

巻号頁・発行日

vol.68, no.8, pp.2193-2202, 1995 (Released:2006-07-09)

参考文献数

37

被引用文献数

11

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Charge separated ion-pair (IP) states formed from three distance-fixed photosynthetic triads were studied by the time-resolved EPR method. Upon photoexcitation of the triads in THF at 77 K, small and narrow signals were observed at the central parts of broad EPR spectra due to the excited triplet states of the chromophores. These signals were assigned to secondary, fully charge separated IP states by the simulation based on the spin-correlated radical pair mechanism. Time dependence of the TREPR signals indicates that charge separation occurs in the singlet manifold as in the case of the photoexcited state dynamics at room temperature. Estimated electron exchange interactions, J, are in the order of 10−2—10−3 mT, which is in line with the observed long lifetimes of the IP states.