Abstract
Optical spectroscopy shows that in aqueous solution the tetracyanoquinodimethane anion radical (TCNQ - ) exist in equilibrium with its π-π dimer (Boyd and Phillips). A study of the effect of various cyclodextrins on this equilibrium shows strilingly different results depending on cavity size and on alkyl derivatization. The equilibrium is unaffected by the presence of α-cyclodextrin. In contrast, γ-cyclodextrin complexes and stabilizes the π-π dimer
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