Abstract
Abstract The nuclear magnetic resonance line width, second moment and the relaxation times T1 and T1p have been measured for protons in a pentachlorobenzenethiol (PCIBT) crystal, from 120 K to the melting point. The results have been interpreted in terms of the various molecular motions occurring in this compound. We observed successively as the temperature increases: the fast jump of the proton around the C-S bond. even at low temperature. The associated activation enthalpy is 7.95 ± 0.2KJ mole−1 and correlation time at 125K is about ∼ 2.8 10−1s. Then appears the in plane molecular reorientation around the pseudo hexad axis, with activation enthalpy equal to 48.5 ± 2 KJ mole−1. and correlation time of 1.610−7s. Then appears the in plane molecular reorientation around the pseudo hexad axis, with activation enthalpy equal to 48.5 ± 2KJ mole−1 and correlation time of 1.610−7s at ambient temperature. These last results are in good agreement with those obtained by Brot by dielectric methods. Before the transi...
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