DYNAMIC INTERACTION OF TCNQ- WITH BETA-CYCLODEXTRIN - A 2-DIMENSIONAL NMR EXCHANGE STUDY

被引：8

作者：

HARTZELL, CJ

MENTE, SR

EASTMAN, NL

BECKETT, JL

机构：

[1] Department of Chemistry, Northern Arizona University, Flagstaff

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1993年 / 97卷 / 19期

关键词：

D O I：

10.1021/j100121a004

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：

Complexation of reduced tetracyanoquinodimethane (TCNQ-) with beta-cyclodextrin results in the formation of a sigma-bonded dimer, (betaCD-TCNQ)2(2-)(J.L.Beckett et al.,1992). H-1 and C-13 NMR show peaks for beta-cyclodextrin both free and in (betaCD-TCNQ)2(2-). By use of 2D H-1 exchange spectroscopy, it is shown that beta-cyclodextrin is undergoing slow exchange at rates from 0.9 s-1 at 30-degrees-C to 5.6 s-1 at 42-degrees-C. The temperature dependence of the rate constant yields an activation energy of 128 kJ/mol.

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页码：4887 / 4890

页数：4

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