Complexation of reduced tetracyanoquinodimethane (TCNQ-) with β-cyclodextrin results in the formation of a σ-bonded dimer, (βCD-TCNQ)22- (J. L. Beckett et al, 1992). 1H and 13C NMR show peaks for β-cyclodextrin both free and in (βCD-TCNQ)22-. By use of 2D 1H exchange spectroscopy, it is shown that β-cyclodextrin is undergoing slow exchange at rates from 0.9 s-1 at 30°C to 5.6 s-1 at 42°C. The temperature dependence of the rate constant yields an activation energy of 128 kJ/mol.
|Original language||English (US)|
|Number of pages||4|
|Journal||Journal of Physical Chemistry|
|State||Published - 1993|
ASJC Scopus subject areas
- Physical and Theoretical Chemistry