A series of novel heterocyclic esters has been prepared based on selenophene, thiophene and furan units; for comparison the parent, phenyl analogue was also prepared. All the materials except the least linear furan analogue are mesogenic and exhibit the SA, SC*, SC*ferri and SC*anti liquid crystalline phases. In addition, the selenophene material exhibits a higher ordered antiferroelectric phase which has been designated the antiferroelectric smectic I (SI*anti) phase and below this the SI* phase was generated. The synthesis, mesomorphic behaviour and physical properties of the materials are reported.
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Seed et al. (1997) studied this question.
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