Binary Systems of Mesogens and Non-mesogens exhibiting Mesomorphism

Applied Chemistry Department, faculty of Technology & Engineering, M. S. University of Baroda, Baroda-390 001 Manuscript received 29 December 1992, accepted 9 March 1993 Liquid crystal formation in eight binary systems are reported in which one or both the components are non-mesogens. The binary systems of non-mesogens, comprising of components with terminal nitro or chloro substituent, exhibit induced smectic or nematic mesophases; induction of mesophase is higher in magnitude for a nitro group as compared to a chloro group. Shorter alkyl/alkoxy chains are not conducive to the mixed mesomorphism, probably due to lack of marked depression in melting points. The systems incorporating a monotropic mesogen and a non-mesogen, exhibit mesomorphic properties comparable with the binary systems of non-mesogens of the present work. Some of the binary compositions exhibit smectic phase at ambient temperature on cooling. The latent transition temperatures for non-mesogens are obtained and the phase diagrams are discussed in detail