Photosensitized Z-E isomerization of cinnamate by covalently linked 2-(3′,4′-dimethoxybenzoyl)benzyl moiety via triplet-triplet energy transfer

被引：10

作者：

Wang, Hong-Bo ^{[1
]}

Zhai, Bao-Chang ^{[1
]}

Tang, Wen-Ilan ^{[1
]}

Yu, Jing-Yu ^{[1
]}

Song, Qin-Hua ^{[1
]}

机构：

[1] Univ Sci & Technol China, Dept Chem, Hefei 230026, Anhui, Peoples R China

来源：

CHEMICAL PHYSICS | 2007年 / 333卷 / 2-3期

基金：

中国国家自然科学基金;

关键词：

Z-E photoisomerization; photosensitization; intramolecular energy transfer; cinnamate; benzophenone;

D O I：

10.1016/j.chemphys.2007.02.003

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：

(Z)- and (E)-2-(3',4'-Dimethoxybenzoyl)benzyl cinnamate (3Z and 3E) and (E)-N-(2-(3',4'-dimethoxybenzoyl)benzoxycarbonymethyl) cinnamide (4E) have been prepared. The photosensitized isomerization of cinnamates via intramolecular triplet-triplet (T-T) energy transfer from the triplet 2-dimethoxybenzophenone (DMBP) moiety was observed. The phosphorescence of the DMBP moiety is quenched by the attached cinnamate, indicating efficient T-T energy transfer from triplet DMBP to the cinnamate. On the basis of the intramolecular phosphorescence quenching and the intermolecular quenching experiments, it can conclude that T T energy transfer to the E isomer is more efficient than to the Z isomer, and faster than the overall decay rate of the sensitizer triplets, and the non-isomerization radiationless decays of triplet 2, or triplet cinnamate moiety in 3 and 4 are faster than the isomerization. The latter be an important reason for low quantum yields of isomerization. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：229 / 235

页数：7