Abstract
Genuine incommensurate smectic A phases were recently discovered, among the rich polymorphism of a new dimesogemc liquid crystal compound (KIS). In the present paper, we examine the role played by molecular parameters in the existence of such incommensurate state. In a series of several homologues of KIS, we find that two smectic modulations exist in agreement with the phenomenological model of frustrated smectics. The condensation of one or the other of these modulations and their coexistence appear to be closely related to the length of the flexible spacer linking the two mesogemc moieties. We observe that only for intermediate spacer length, the elasticity of the system allows the occurrence of incommensurate SA phases.
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