A STUDY OF THE INCLUSION COMPLEXES OF BETA-CYCLODEXTRIN WITH 3 ELECTRONIC STATES OF 4-(N,N-DIMETHYLAMINO)BENZONITRILE

被引：18
|
作者：
ELBARAKA, M [1 ]
GARCIA, R [1 ]
QUINONES, E [1 ]
机构：
[1] UNIV PUERTO RICO,DEPT CHEM,BOX 23346,UPR STN,RIO PIEDRAS,PR 00931
来源：
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | 1994年 / 79卷 / 03期
基金：
美国国家科学基金会; 美国国家卫生研究院;
关键词：
D O I：
10.1016/1010-6030(93)03765-9
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：
A marked difference among the inclusion formation constants of beta-cyclodextrin (beta-CD) and three electronic states of 4-(N,N-dimethylamino)benzonitrile (DMABN), namely the ground state S0, the Franck-Condon excited state B* and the charge transfer state A*, is found. The complexation reaction involving the B* state is exothermic, while the complexation of the A* state is entropy driven, indicating different mechanisms. Evidence is presented to suggest that B* and A* occupy different microenvironments within the CD. A 1:1 stoichiometry is confirmed for the three reactions. Values of DELTAH-0 and DELTAS0 are derived from the temperature dependence of the equilibrium constants.
引用
收藏
页码：181 / 187
页数：7
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