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Mukesh L. Chauhan* and Jignesh M. Patel


A Novel homologous series of mesogens have been synthesized and studied with a views to understand and establish the relations between molecular structure and liquid crystal properties of a Compounds. Totally eleven members of series synthesized. Mesogenic behaviors commences from C6 member of a series and continued up to C16 member. The rest of the members C1 to C5 are nonmesogenic. Mesogenic homologues (C6 to C16) are enantiotropically nematogenic. Textures of nematic phase are threaded or schlieren. Transition temperatures were determined by an optical polarizing microscopy equipped with a heating stage. Analytical and structural data confirms the molecular structures of homologues. Thermal stability for nematic is 195ºC. Mesomorphic phase length range from 9.0ºC to 33.0ºC. Cr-I/N and N-I transition curves of a phase diagram behave in normal manner from C1 to C16 members. Mesogenic properties of present novel ester series are compared with the structurally similar series. Odd-even effect is missing for the N-I transition curve. Thus present series is partly nematogenic without exhibition of smectic property whose transition temperatures vary between 180ºC and 205ºC.

Keywords: Liquid Crystal, Smectic, Nematic, Mesogen, Mesomorphism.

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