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International Letters of Chemistry, Physics and Astronomy
Volume 50

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Mesomorphism Dependence on Molecular Flexibility at Constant Rigidity

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A Novel homologous series of high transition temperature RO-C6H4-CH=CH-COO-C6H4-N=CH-CH=CH-C6H5 has been synthesis and studied with a view to understand establish and evaluate the relation between liquid crystal properties and the molecular structure of a substance. A series consists of thirteen homologues. All the homologues are mesogenic. Smectic mesophase commences from C12 to C18 homologues. Nematic mesophase appears from C1 to C18 homologues. The textures of a nematic phases are of threaded or schlieren and that of the smectic phase are focal conic fan shaped of smectic-A or C type. Transition temperatures and textures were determined by an optical polarizing microscopy equipped with a heating stage. The analytical and spectral data confirms the molecular structures of homologues. Thermal stability for smectic and nematic are 118.5 0C and 224.77 °C, whose total mesophase length ranger from 73.0 °C to 111 °C. The liquid crystal properties from homologue to homologue varies in the same series. Some liquid crystal properties of present series are compared with the structurally similar known homologous series. Present novel homologous series is partly smectogenic and fully nematogenic and of higher ordered melting type and high thermal stability


International Letters of Chemistry, Physics and Astronomy (Volume 50)
D.T. Pidwani et al., "Mesomorphism Dependence on Molecular Flexibility at Constant Rigidity", International Letters of Chemistry, Physics and Astronomy, Vol. 50, pp. 1-8, 2015
Online since:
May 2015