We present differential scanning calorimetry, optical and X-ray diffraction measurements for a new dimesogenic liquid crystal compound (KI5). The rich polymorphism of this compound includes new smectic phases and rare phase transitions. In particular the first observation in a pure compound of two incommensurate SA phases as well as cholesteric and helical smectic phases (TGB and SC* phases) are reported. We discuss this observation in terms of the dual peculiar structural character of the molecule : a polyphilic and dimesogenic system including the concept of the central flexible spacer.
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Hardouin et al. (1994) studied this question.