The molecular structure and reorientation of parafluorobenzaldehyde dissolved in a smectic mesophase studied using N.M.R. spectroscopy

Abstract

Analysis of the proton, fluorine and deuterium N.M.R. spectra of parafluorobenzaldehyde, and the -CDO derivative, dissolved in the smectic A phase of the mesogen, 4,4′-bis-n-heptylazoxybenzene, yields dipolar and quadrupolar splittings which have been used to determine the relative positions of the interacting nuclei, and the ordering matrix. It is found that the ordering matrix changes on each internal rotation, thus molecular reorientation and internal rotation are not independent.