Crystalline arrangement of some disc like compounds

Three triphenylene esters, disc-like molecules, belonging to a series of compounds, some of which show a new mesomorphic and thermotropic phase have been studied by X-ray diffraction. The crystal structure of one of these esters has been established. Molecules are associated in pairs with their triphenylene cores parallel and 3.43 Å. These dimers give columns arranged in hexagonal lattice.