Abstract
The 1H N.M.R. spectrum with carbon-13 satellites of monoiodobenzene dissolved in a nematic liquid crystal was recorded and analysed. The r α-structure was obtained by using the force field of monobromobenzene in the calculation of the harmonic vibrational corrections to the dipole-dipole coupling constants. The H-C and C-C bond lengths and the CCC and CCH bond angles are reported. The nature of the orienting forces was studied by calculating the theoretical relationships between the two independent ordering matrix elements for monoidobenzene using simple models based on dispersion and repulsion forces. The results strongly suggest that dispersion forces are decisive in thermotropic ZLI 1132 and ZLI 1167 liquid crystals and significant also in some lyotropic liquid crystals.
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