Abstract
A high-resolution ac calorimetric study has been carried out on two homologous polar liquid crystals with aromatic cores containing three phenyl groups and a flexible chiral linking group. The expected smectic polymorphism occurs, and there are several prominent thermal features in the nematic range between smectic-${A}_{d}$ and smectic-$\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{C}$ phases. It is suggested on the basis of characteristic thermal signatures, helical pitch variations, and optical textures that a twist-grain-boundary phase and chiral line liquids ${(N}_{L}^{*})$ exist as well as twisted nematic liquid crystals ${(N}^{*})$ with other kinds of short-range order.
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