L. Garel et al., COMPLEXATION OF METHANE AND CHLOROFLUOROCARBONS BY CRYPTOPHANE-A IN ORGANIC SOLUTION, Angewandte Chemie, International Edition in English, 32(8), 1993, pp. 1169-1171
Equivalent to a supercritical fluid is a description of the- state of
the methane molecule in the interior of the host cavity of a cryptopha
ne molecule. The CH4-cryptophane complex (shown on the right) is amazi
ngly stable even at room temperature (K(a) = 130 M-1), and its half-li
fe is 6 mus. The findings of this study shed light on the bonding betw
een neutral guest and neutral host molecules.