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International Letters of Chemistry, Physics and Astronomy
Volume 60
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Study of Mesomorphism in Isomeric and Nonisomeric Linear and Nonlinear Chalconyl Series

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Abstract:

A novel nonlinear chalconyl homologous series of ester: RO-C6H4-COO-C6H4 (m)-CO-CH:CH-C6H4-OC16H33(n) (para) have been synthesized and studied with a view to understand and establish the relation between thermotropic liquid Crystal (LC) properties and geometrically nonlinear shaped molecular structure. Homologous series consists of thirteen members ( C1 to C18) whose enantiotropic nematogenic mesomorphism commences from C6 homologue without exhibition of smectic property. C1 to C5 homologues are nonmesomorphic. Transition temperatures and textures of homologues were determined by an optical polarising microscopy equipped with a heating stage (POM). Transition curves of a phase diagrams (Cr-N/I and N-I) behaved in normal manner. N-I transition curve exhibited odd-even effect. Textures of a nematic phase are threaded or schlieren. Analytical and spectral data supported molecular structures of homologues. Thermal stability for nematic is 104.5°C whose degree of mesomorphism vary minimum of 13.0°C to maximum of 37.0°C. Group efficiency order for nematic is derived by comparing present novel series with structurally analogous other homologous series. Thus, homologous series of present investigation is nematogenic with absence of smectic property and of middle ordered melting type with considerable degree of mesomorphism.

Info:

Periodical:
International Letters of Chemistry, Physics and Astronomy (Volume 60)
Pages:
182-191
Citation:
V. S. Sharma and R.B. Patel, "Study of Mesomorphism in Isomeric and Nonisomeric Linear and Nonlinear Chalconyl Series", International Letters of Chemistry, Physics and Astronomy, Vol. 60, pp. 182-191, 2015
Online since:
September 2015
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[1] V. Sharma, R. Patel, "Tuning the mesomorphic properties of nonisomeric chalconyl-ester bases homologous series: The effect of tail group", Molecular Crystals and Liquid Crystals, Vol. 643, p. 40, 2017

DOI: https://doi.org/10.1080/15421406.2016.1262686

[2] V. Sharma, R. Patel, "Effect of alkyl chain in the terminal ester group on mesomorphic properties of new rod like homologous series: Synthesis and characterization", Molecular Crystals and Liquid Crystals, Vol. 643, p. 62, 2017

DOI: https://doi.org/10.1080/15421406.2016.1262690

[3] P. Patel, R. Shah, "Dependence of mesomorphism on geometrical shapes of isomeric and nonisomeric series of chalconyl esters", Molecular Crystals and Liquid Crystals, Vol. 643, p. 168, 2017

DOI: https://doi.org/10.1080/15421406.2016.1264227

[4] V. Sharma, R. Patel, "Synthesis, characterization, and mesomorphic investigation of vinyl ester-substituted chalcones and effect of lateral ‒NO2 and ‒OCH3 group", Molecular Crystals and Liquid Crystals, Vol. 643, p. 241, 2017

DOI: https://doi.org/10.1080/15421406.2016.1272814

[5] V. Sharma, R. Vekariya, A. Sharma, R. Patel, "Mesomorphic properties of liquid crystalline compounds with chalconyl central linkage in two phenyl rings", Liquid Crystals Today, Vol. 26, p. 46, 2017

DOI: https://doi.org/10.1080/1358314X.2017.1359401
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