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
与分子间三重态能量转移 (
TT) 过程相关的自由能和熵变化是通过使用激光闪光光解技术直接测量平衡常数来确定的。在
TT 反应中,
10,10-二甲基蒽酮和
9,9-二甲基芴被合成并分别用作刚性供体和受体,与非刚性供体
4-甲基二苯甲酮和非刚性受体
4-甲基联苯相比。非刚性供体和非刚性受体在从扭曲组态到平面三重态的过程中都会失去熵。
4-甲基二苯甲酮和
4-甲基联苯的ΔS值分别为0.5-1.0和2.5-3.0吉布斯/摩尔。39 个参考文献,3 个图,1 个标签。