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Molecular solutes in nematic liquid crystals: Orientational order and electric field gradients |
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| Authors: | G.N. Patey E.E. Burnell J.G. Snijders C.A. de Lange |
| Affiliation: | Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, B.C., Canada V6T 1Y6;Departments of Theoretical and Physical Chemistry, Free University, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands |
| Abstract: | The difference between liquid-crystal and gas-phase values for the nuclear quadrupole coupling constant in D2 and HD is used to obtain the mean electric field gradient in various liquid crystals. Order parameters for small molecules dissolved in liquid crystals are calculated assuming that the orientational order arises from the interaction of the molecular quadrupole moment with the average field gradient. The results obtained are in good agreement with experimental values for hydrogen and several other solutes. |
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