Piperidine aminoxyl radicals are reversibly bound in the cavity of a water-soluble cryptophane with an affinity of the order of 103 dm3 mol–1; the complexation equilibrium is slow on the EPR timescale and the magnitude of the nitrogen hyperfine splittings of the bound substrates indicates that the cavity of this cryptophane has a polarity comparable to that of halogenated solvents.
L. Garel, H. Vezin, J. Dutasta and A. Collet, Chem. Commun., 1996, 719 DOI: 10.1039/CC9960000719
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