STUDIES OF SOME HETEROCYCLIC MESOGENS.

Article abstract of DOI:10.1080/15421407408082809

New mesogens have been prepared and studied by differential thermal analysis and optical microscopy to elucidate the effects on mesomorphic properties of replacing a benzene ring by different heterocyclic rings. To supplement earlier work and to complement the above studies of changing the terminal groups of molecules, compounds with pyridyl rings in non-terminal positions have also been studied. The overall results relating to the mesophases formed and the trends in the crystal-mesophase or -amorphous liquid and mesophase-mesophase or -amorphous liquid transition temperatures are discussed in terms of changes in axial molecular polarizability produced by the hetero-atom either directly or indirectly.