Probing director fluctuations in nematic solutions by N.M.R. The breakdown of the simple RD + DF model for tolan in nematic Phase V

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Abstract
Frequency dependent relaxation measurements have been carried out on the para deuterons of tolan-d 10 (diphenylethyne), dissolved in Merck Phase V. The results are compared with those of three smaller probe molecules, studied previously. The simple RD + DF model which works well for the smaller probes, cannot give a satisfactory explanation for the relaxation behaviour, in particular the strong relaxation dispersion, of the para deuterons of tolan. The simple RD + DF model does not account properly for the effects of director fluctuations if the degree of orientation of the probe molecule studied is too high; this appears to be the case for tolan.