Abstract
AbstractA number of sodium salt complexes of p‐tert‐butylcalix[4]arene tetraethyl ester (1) were isolated both with and without upper‐rim encapsulated acetonitrile or methanol. Upon dissolution in CDCl3, 1 remained largely complexed to the sodium cation but ca. 90 % of the upper‐rim bound solvent was released, reflecting the relative values of the binding constants for complexation of the two guest species. Selective decomplexation of lower‐rim bound sodium cations could be successfully achieved using low‐pressure light sources, triggering the immediate expulsion of the upper‐rim bound solvent. The extent of decomplexation at both rims is controlled both by the oxidation of the counter‐anionic species at the lower rim and by the fate of the photoproducts generated. The calixarene host molecule, 1, remains intact during the decomplexation process. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)
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