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Influence of chiral additives onto molecular parameters of binary mixtures of cholesteric liquid crystals

We present a study of the influence of new chiral additives 2 and 3 on phase transition and molecular parameters of binary mixtures of cholesteryl enantate and cholesteryl laurate. The addition of these compounds to the binary mixture of the cholesteryl enantate and cholesteryl laurate results in shift of the cholesteric smectic phase transition towards the direction of lower temperatures, about 10 - 12 degree(s)C. Using X-ray diffraction on the crystalline powder of unoriented samples we have determined the molecular parameters: the thickness of smectic and cholesteric layers (d) and the value of molecular parameter average distance between the long axes of neighboring molecules (D). The calculation of the value of molecular parameters d and D, indicates decrease of the thickness and packing density of the molecules of smectic layers, in Mix 1 and Mix 2, compared to 50 - 50% mixture.