Abstract
Primary, secondary and tertiary alcohols and their deutero- and thio-analogues generally exhibited dielectric relaxations at low temperatures when diluted in hydrocarbon media. Some of the relaxations are attributable to independent internal rotations of unassociated molecules. These include a strong relaxation of tricyclohexyl carbinol in the MHz range at liquid helium temperature which appeared to be associated with a tunnel splitting of the order of 0.5 cm −1, and the relaxation of a series of thiols in the range 8–80 kHz at 4.2 K. We compare the low temperature dielectric response of a matrix-isolated molecule composed of an asymmetric top on a C 3v frame with the analogous C 2v problem and suggest there is no qualitative observable difference. The alcohol and thiol data are compared with analogous phenol data reported recently.
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