Issue 11, 1988

Deuterium quadrupole-echo studies of molecular motion in a biphenyl–β-cyclodextrin clathrate

Abstract

Deuterium quadrupole spin-echo spectra have been obtained at 12 temperatures between 103 and 303 K for deuterated derivatives of biphenyl in polycrystalline β-cyclodextrin clathrates. Reorientation of biphenyl in the clathrate channel may be modelled by constructing a grid of positions for the p,p′-axis and using a multisite simulation program to calculate spectra for different patterns of site-to-site hopping. It is found that above 240 K the biphenyl p,p′-axis librates in a cone of half angle ca. 27 °, with an Arrhenius activation energy 58 ± 4 kJ mol–1. Between 163 K and the lowest measured temperature the p,p′-axis librates over a more restricted range of angles, with a much lower activation energy, 4 kJ mol–1. The simple models developed here do not suffice to account quantitatively for the transition from this motion to the thermally activated motion observed at higher temperatures.

Article information

Article type
Paper

J. Chem. Soc., Faraday Trans. 1, 1988,84, 3761-3776

Deuterium quadrupole-echo studies of molecular motion in a biphenyl–β-cyclodextrin clathrate

A. D. Ronemus, R. R. Vold and R. L. Vold, J. Chem. Soc., Faraday Trans. 1, 1988, 84, 3761 DOI: 10.1039/F19888403761

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