Crystal Structure of a Mesogenic Twin

Abstract The compound under study is a double mesogen in which two rigid p-terphenyl-based units are laterally connected by a carbonate linker. The cystal structure has been determined and reported. Here some crystallogra-phic calculations have been done to correlate the structure – property relationship of the compound. The six rings are found to be in different conformations. No two rings are coplanar. The four decycloxy side chains are maximally extended. Molecules of the compound are packed along the crystallographic a-axis. The molecular arrangement is a precursor of smectic phase. Texture study has been performed and supercooling region was found. The layer spacing and intermolecular distance during the entire mesomorphic range have been studied from X-ray diffraction technique.