PHOTOINDUCED ELECTRON-TRANSFER REACTIONS OF PORPHYRIN HETEROAGGREGATES - ENERGY-GAP DEPENDENCE OF AN INTRADIMER CHARGE RECOMBINATION PROCESS

被引：100

作者：

SEGAWA, H

TAKEHARA, C

HONDA, K

SHIMIDZU, T

ASAHI, T

MATAGA, N

机构：

[1] KYOTO UNIV, GRAD SCH ENGN, DIV MOLEC ENGN, KYOTO 606, JAPAN

[2] OSAKA UNIV, FAC ENGN SCI, DEPT CHEM, TOYONAKA, OSAKA 560, JAPAN

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1992年 / 96卷 / 02期

关键词：

D O I：

10.1021/j100181a001

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A direct measurements of the kinetics of intradimer photoinduced electron-transfer reactions of a porphyrin heteroaggregate composed of a water-soluble gold porphyrin and a water-soluble zinc porphyrin has been made by picosecond time-resolved absorption studies in aqueous solution. By the photoexcitation of the heterodimer, the contact radical ion pair (CIP) of the heterodimer is formed through an extremely fast process within a few picoseconds. The CIP does not dissociate readily to solvated radicals but tends to decay through a nonradiative charge recombination process. The rate constant of the charge recombination of the CIP decreases as the exothermicity of the electron transfer increases.

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页码：503 / 506

页数：4

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