Re-entrant and induced mesophases: Mixed systems showing re-entrant TGBAand re-entrant cholesteric phases

We have investigated the behaviour of chiral carbohydrate-based trioxadecalines with a cyano group in mixed systems. The mixture of a trioxadecaline having a Ch phase and a trioxadecaline having a Ch, SA and a S∗Cphase sequence induces a re-entrant TGBA and Ch phase. Below the stabilized S∗C phase, a re-entrant Ch phase is observed. In the mixture of the cholesteric trioxadecaline with CCH7, itself only showing a nematic phase, a TGBA phase and a broad range SA phase are induced from two non-smectic compounds. Both mixtures show a blue phase with a pitch ranging from the UV to red depending on the molar fraction.