Molecular Crystals and Liquid Crystals p. 21 - 30 (2016)
Update date:2022-08-25
Topics:
Travadi
Vadodaria
Ladva
Doshi
A novel homologous series of liquid crystal (LC) derivatives of general structure: RO·C6H4·COO·C6H3·OCH3(ortho)CH = CH·COO·(n)C5H11 was synthesized and studied with a view to understanding the effect of molecular structure on liquid crystal behavior with reference to lateral-OCH3 and terminal end group. Homologous series consists of 12 derivatives (C1-C16), the first five (C1-C5), and the last (C16) members are not liquid crystals and the rest of the homologs (C6-C14) are enantiotropically smectogenic without exhibition of the nematic phase. The textures of the smectic phases are focal conic fan shaped or batonets of smectic-A or smectic-C. Average thermal stability for smectic is 81.8°C and mesophase length ranges from 9°C to 31°C. Transition curves of a phase diagram (Sm-I and Cr-Sm/I) behave in a normal manner. The Sm-I transition curve exhibits an odd-even effect. Analytical and spectral data support the molecular structures. The series is smectogenic of a middle ordered melting type. LC properties of the present series are compared with structurally similar known homologous series. Transition temperatures were determined by an optical polarizing microscope equipped with a heating stage.
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Doi:10.1021/acs.macromol.6b00629
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