Deuteron and proton NMR study of D2, p-dichlorobenzene and 1,3,5-trichlorobenzene in bimesogenic liquid crystals with two nematic phases

Abstract The solutes dideuterium, 1,3,5-trichlorobenzene and p -dichlorobenzene (pdcb) are co-dissolved in a 61/39 wt% mixture of CBC9CB/5CB, a bimesogenic liquid crystal with two nematic phases. NMR spectra are collected for each solute. The local electric field gradient ( F ZZ ) is obtained from the dideuterium spectrum. A double Maier-Saupe potential (MSMS) is used to rationalize the order parameters of pdcb. The liquid-crystal fields G 1 and G 2 are taken to be due to size and shape interactions and interactions between the solute molecular quadrupole and the mean F ZZ of the medium. The F ZZ ’s obtained from D 2 and G 2 (from pdcb) are compared and discussed.