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International Letters of Chemistry, Physics and Astronomy
Volume 58
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Study of Molecular Flexibility Operated Mesomorphism

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Abstract:

Homologous series RO-C6H4-CH=CH-COO-C6H4-CO-CH=CH-C6H4-OC14H29(P) of chalconyl novel derivatives have been synthesized and studied with a views to understand and establish the relation between molecular structure and the liquid crystal (LC) properties of thermotropic mesomorphs Series consists of thirteen homologues. Five homologues (C1 to C5) are nonliquid crystal (NLC) and the rest of the homologues (C6 to C18) are enantiotropically nematogenic without exhibition of smectic property. Transition temperatures and textures were determined by an optical polarizing microscope equipped with a heating stage (POM). Transition curves of a phase diagram (N-I and Cr-I/N) behaved in normal manner. N-I transition curve exhibited odd-even effect with negligible abnormality in its behaviour at the C14 homologue. Thermal stability for nematic is 99.75°C.The degree of mesomorphism vary minimum 19°C at the C6 homologue to maximum 28°C at the C8 homologue. Analytical and spectral data confirms the molecular structures of the novel homologues. Evaluated thermal data of present novel series are compared with other structurally similar homologous series. Textures of Nematic phase are threded or schlieren.

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Periodical:
International Letters of Chemistry, Physics and Astronomy (Volume 58)
Pages:
16-25
Citation:
B.B. Jain and R.B. Patel, "Study of Molecular Flexibility Operated Mesomorphism", International Letters of Chemistry, Physics and Astronomy, Vol. 58, pp. 16-25, 2015
Online since:
September 2015
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Cited By:

[1] B. Jain, R. Patel, "Synthesis and mesomorphism of novel chalconyl esters with a lateral nitro group", Molecular Crystals and Liquid Crystals, Vol. 637, p. 1, 2016

DOI: https://doi.org/10.1080/15421406.2016.1190500

[2] N. Muniya, V. Patel, "Mesomorphism and flexibility of alkyl chains in chalcone esters", Molecular Crystals and Liquid Crystals, Vol. 638, p. 95, 2016

DOI: https://doi.org/10.1080/15421406.2016.1221989

[3] B. Jain, R. Patel, "Synthesis and study of new homologous series of ester-chalcone exhibiting nematic phases", Molecular Crystals and Liquid Crystals, Vol. 638, p. 35, 2016

DOI: https://doi.org/10.1080/15421406.2016.1217711

[4] P. Patel, R. Shah, "Dependence of mesomorphism on flexibility of lateral and terminal groups of chalconyl esters", Molecular Crystals and Liquid Crystals, Vol. 641, p. 1, 2016

DOI: https://doi.org/10.1080/15421406.2016.1217702
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