MULTIPLE DECAY PATHWAYS AND ELECTRON-TRANSFER IN EXCITED ION-PAIRED ZINC COPPER PORPHYRINS - LASER PHOTOLYSIS AND TIME-RESOLVED EPR SPECTROSCOPY

被引:33
作者
HUGERAT, M
LEVANON, H
OJADI, E
BICZOK, L
LINSCHITZ, H
机构
[1] HEBREW UNIV JERUSALEM,FARKAS RES CTR PHOTOINDUCED PROC,IL-91904 JERUSALEM,ISRAEL
[2] SE MASSACHUSETTS UNIV,DEPT CHEM,N DARTMOUTH,MA 02747
[3] BRANDEIS UNIV,DEPT CHEM,WALTHAM,MA 02254
关键词
D O I
10.1016/0009-2614(91)90370-O
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
Oppositely charged zinc and copper porphyrins form ion-paired dimers which show biphasic decay of flash transients in fluid solution. In a glass at low temperature, two photoexcited components are also seen by time-resolved EPR. On the basis of lifetime, absorption spectrum, oxygen sensitivity and EPR spectrum, the long-lived transient is assigned to the zinc porphyrin triplet. The short-lived species is attributed to an ion radical-pair formed by electron transfer from an excited singlet precursor.
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页码:400 / 406
页数:7
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