L. Garel et al., PIPERIDINE AMINOXYL RADICALS AS EPR PROBES FOR EXPLORING THE CAVITY OF A WATER-SOLUBLE CRYPTOPHANE, Chemical communications, (6), 1996, pp. 719-720
Piperidine aminoxyl radicals are reversibly bound in the cavity of a w
ater-soluble cryptophane with an affinity of the order of 10(3) dm(3)
mol(-1); the complexation equilibrium is slow on the EPR timescale and
the magnitude of the nitrogen hyperfine splittings of the bound subst
rates indicates that the cavity of this cryptophane has a polarity com
parable to that of halogenated solvents.