Abstract
A novel approach to designing liquid crystal dimers with high chirality is described. The synthesis, and liquid crystal properties of several new optically active unsymmetrical fluorescent dimers belonging to four homologous series are presented. These new oligomesogens possess pro-mesogenic cholesterol as a chiral moiety covalently linked to a fluorescent bent aromatic (chalcone) core through a trimethylene (4-oxybutanoyl)/tetramethylene (5-oxypentanoyl)/pentamethylene (6-oxyhexanoyl)/heptamethylene (8-oxyoctanoyl) central spacer giving rise to four series of chiral dimers. In each series, the chalcone entity is substituted with ethoxy, n-butyloxy to n-dodecyloxy tails, with the aim of learning the relation between the molecular structure and thermotropic behavior. The molecular structures have been characterized by routine characterization techniques. These compounds are fluorescent, as evidenced by recording the emission spectra for two different excitation maxima for some representative compounds. The...
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