Abstract
Transition properties of a homologous series of novel S-shaped oligomers on varying the spacer length, core structure and linking group were investigated. All the S-shaped oligomers showed a nematic (N) phase on cooling. Formation of the N phase is interpreted in terms of the length to diameter (L/D) ratio, indicating that intramolecular core-core interaction plays an important role in stabilizing N phases. A non-symmetric S-shaped oligomer possessing cyanobiphenyl and phenylpyrimidine moieties exhibited enantiotropic N and smectic A (SmA) phases. The high stability of the SmA phase results from intermolecular interactions between the unlike mesogenic moieties. We discuss physical properties of the S shaped system that has structure within structure.
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