Abstract
Chiral, smectogenic pendant groups have been covalently attached to cyclic oligosiloxanes by hydrosilylation. Differential scanning calorimetry, optical polarising microscopy, and X-ray diffraction measurements reveal liquid crystalline properties for all synthesized monomers and oligomers. The monomers, which differ by the nature of the rigid mesogenic core or end groups, showed enantiotropic smectic A phases. Almost all of cyclic oligosiloxanes present enantiotropic chiral smectic C phases. The mesomorphic range of these oligomers is greatly enhanced relative to the type of monomers and the ring size as well.
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