Electron paramagnetic resonance observation of dc electric field effects in nematic liquid crystals

The trigonal symmetry of organic triradicals makes them important candidates for spin probes of liquid crystals. Here we develop a lineshape model for such spin probes, within the limit of fast motion, and show how the E.S.R. spectra depend on the orientation of the director with respect to the magnetic field. The theory is employed to study the lineshapes of trisverdazyl radicals in 4,4'-dimethoxyazoxybenzene, aligned by a high frequency electric field. An analysis of the angular-dependent linewidths provides reliable values for the order parameter /34. They are in good agreement with statistical theories of nematic liquid crystals.

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Orientational order of triradical spin probes in nematic liquid crystals

Kothe

Berthold

Ohmes

1980

Molecular Physics

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Flow Patterns in Bulk Samples of a Nematic Liquid Crystal Due to Electric Fields

Sinclair

Caar

1976

Molecular Crystals and Liquid Crystals

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Electron paramagnetic resonance observation of dc electric field effects in nematic liquid crystals

Cited by 2 publications

References 15 publications

Orientational order of triradical spin probes in nematic liquid crystals

Orientational order of triradical spin probes in nematic liquid crystals

Flow Patterns in Bulk Samples of a Nematic Liquid Crystal Due to Electric Fields

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