Antiferroelectric liquid crystals based on the salicylaldimine in connection with linear alkynyl chain

A novel homologous series of chiral salicylaldimine-based liquid crystals in connection with linear alkynyl chain, C m YCBOC8* ( m =610), have been synthesised and their mesomorphic phases have been studied. All of the materials possessed antiferroelectric smectic C (SmCA*) phase, which was confirmed by the observations of microscopic texture, switching current behaviour and dielectric permittivity.