FREE-ENERGY AND ENTROPY CHANGES IN VERTICAL AND NONVERTICAL TRIPLET ENERGY-TRANSFER PROCESSES BETWEEN RIGID AND NONRIGID MOLECULES - A LASER PHOTOLYSIS STUDY

被引：11

作者：

ZHANG, D ^{[1
]}

CLOSS, GL ^{[1
]}

CHUNG, DD ^{[1
]}

NORRIS, JR ^{[1
]}

机构：

[1] ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 1993年 / 115卷 / 09期

关键词：

D O I：

10.1021/ja00062a036

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The free energy and entropy changes associated with intermolecular triplet energy transfer (TT) processes were determined by direct measurement of the equilibrium constant using a laser flash photolysis technique. 10,10-Dimethylanthrone and 9,9-dimethylfluorene were synthesized and used as a 'rigid' donor and acceptor, respectively, in comparison with 4-methylbenzophenone, a ''nonrigid'' donor, and 4-methylbiphenyl, a ''nonrigid'' acceptor, in the TT reactions. Both the nonrigid donor and the nonrigid acceptor lose entropy while going from the twisted ground state to the planar triplet state. The DELTAS values for 4-methylbenzophenone and 4-methylbiphenyl are 0.5-1.0 and 2.5-3.0 gibbs/mol, respectively.

引用

页码：3670 / 3673

页数：4

共 45 条

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