PORPHYRIN-QUINONE ELECTRON-TRANSFER REVISITED - THE ROLE OF EXCITED-STATE DEGENERACY IN ULTRAFAST CHARGE-TRANSFER REACTIONS

被引：61

作者：

WYNNE, K ^{[1
]}

LECOURS, SM ^{[1
]}

GALLI, C ^{[1
]}

THERIEN, MJ ^{[1
]}

HOCHSTRASSER, RM ^{[1
]}

机构：

[1] UNIV PENN,DEPT CHEM,PHILADELPHIA,PA 19104

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 1995年 / 117卷 / 13期

关键词：

D O I：

10.1021/ja00118a011

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Ultrafast time-resolved anisotropy experiments in which electronically excited [5-(1',4'-benzoquinonyl)-10,1 5,20-triphenylporphinato]magnesium (MgPQ) was probed with polarization both parallel and perpendicular to the pump pulse have been carried out in a variety of solvents. These results show that the photoinduced electron transfer process involving the locally-excited MgP*Q state is solvent independent, while the thermal charge recombination reaction is solvent dependent. Moreover, these studies indicate that the photoinduced charge separation reaction may be rate-limited by electronic population equilibration between near degenerate porphyrin Q(x) and Q(y) levels.

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页码：3749 / 3753

页数：5

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