Order Parameters and Carbon Shielding Tensors of some Anthracene Derivatives from 13C NMR Experiments, J. Phys. Chem., 100, 17157-17167 (1996)


The orientational order parameters and approximate 13C shielding tensors of anthracene and of six of its 9,10-derivatives: 9,10-dihydro- anthracene, 9,10-dimethyl-anthracene, 9,10-dibromo-anthracene, anthraquinone, 9,10-diphenyl-anthracene and 9,10-bis(phenylethynyl)-anthracene dissolved in the nematic liquid crystal ZLI-1167 have been determined using a recently proposed 13C NMR method.

The biaxial order parameters obtained are compared with some current theoretical models of ordering, as we see here for anthracene.

We find that none of these mean field approaches is completely satisfactory, in the sense that none can rationalize the complete set of ordering matrices for the various solutes.