INVESTIGATION OF SPIN-CORRELATED ION-PAIRS IN DISTANCE-FIXED TRIADS BY TIME-RESOLVED ELECTRON-PARAMAGNETIC-RESONANCE

被引：9

作者：

NAKAMURA, H ^{[1
]}

TERAZIMA, M ^{[1
]}

HIROTA, N ^{[1
]}

NAKAJIMA, S ^{[1
]}

OSUKA, A ^{[1
]}

机构：

[1] KYOTO UNIV, FAC SCI, DEPT CHEM, KYOTO, JAPAN

来源：

BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN | 1995年 / 68卷 / 08期

关键词：

D O I：

10.1246/bcsj.68.2193

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

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页码：2193 / 2202

页数：10

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