Dynamic interaction of TCNQ- with β-cyclodextrin: A two-dimensional NMR exchange study

Cynthia J Hartzell, Scot R. Mente, Nathan L. Eastman, Jackie L. Beckett

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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 languageEnglish (US)
Pages (from-to)4887-4890
Number of pages4
JournalJournal of Physical Chemistry
Issue number19
StatePublished - 1993


ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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