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International Letters of Chemistry, Physics and Astronomy
ILCPA Volume 64

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Study of the Effects of Decreasing Molecular Rigidity on Mesomorphism

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A Chalconyl homologous series: RO-C6H4-CH=CH-CO-C6H4-OC14H29(n) (meta) is synthesized and studied with a view to understand and establish the effect of molecular structure on Liquid crystal behaviour by reducing molecular rigidity through diminishing of a phenyl ring and a central carboxy or vinyl carboxy group from a molecule. Novel series consists of thirteen homologues (C1 to C18). First member (C1) homologue is nonliquid crystal and the rest of the homologues (C2 to C18) are enantiotropically ( C2 to C5) nematogenic or monotropically (C6 to C18) nematogenic plus smectogenic of low mesophaselengths and low transition temperatures ( 38°C to 76°C). Transition temperatures were determined by an optical polarizing microscopy (POM) equipped with a heating stage. Cr-N/I, N-I, I-N, N-Sm transition curves behaved in normal manner in a phase diagram. N-I and I-Sm transition curves exhibited odd-even effect. Textures of nematic phase are threaded or schlieren and that of the smectic phase are of the type A or C. Analytical, spectral and thermal data supported molecular structure of homologues. Thermal stability ( N-I/ I-N) of series for nematic is 67.5°C and that of the smectic is very low. Group efficiency order derived on the basis of thermal stability is as under. –Cl with –C6H4.COO- > -OC14H29(n) without –C6H4.COO-with reference to central bridge –CH=CH-CO-.


International Letters of Chemistry, Physics and Astronomy (Volume 64)
V. S. Sharma et al., "Study of the Effects of Decreasing Molecular Rigidity on Mesomorphism", International Letters of Chemistry, Physics and Astronomy, Vol. 64, pp. 69-76, 2016
Online since:
February 2016

[1] Reintitzer, F., Monatsh 9, 421 (1888).

[2] Hird, M., Toyne. K. J., and Gray G. W., Day S. E. and Mc. Donell D. G., (1993), Liq. Cryst. 15, PP. 123.

[3] Collings P. J. and Hird M., (1997), Introduction of Liquid Crystals chemistry and physics, Taylor and Francis Ltd. U. K., (1998).

[4] Marcos, M., Omenat, A., Serrano, J. L. and Ezcurra, A., (1992), Adv. Matter, 4, 285.

[5] Hird, M., Toyne, K. J., Gray, G. W., Day, S. E., (1993) Liq. Cryst. 14, PP. 741.

[6] S. Naruma. Advance LCD technologies, Display 22 (1) (2001) PP. 1.

[7] Kim,W. S., Elston S. J. and Raynes F. P., Displays 29 (2008). PP. 458-463.

[8] Tadwee Imaran, Dr. Sahanashahi, VivekRamteke, Iftequar Syed, Liquid Crystals pharmaceutical Application: A review, IJPRAS, ISSN 2277-36. Vol. 1, Issue 2 (2012), 06-11.

[9] Gray G. W. and Winsor P. A. ( Eds ) Liquid Crystals and plastic crystals, chapter-6. 2, The role of liquid crystal in life processesby Stewart G. T., Vol-1, PP. 308-326.

[10] C.A. Calliste, Bail le J. C, Trouilas P, Poug C, Chulia A. J, Duroux L.J., Anticancer, Res, (2001), 21, 3949-3956.

[11] Rajesh. G, Mansi. K, Srikant. K, Babasaheb. B, Nagesh. D, Kavita. S, Ajay.C., Chem. Pharm. Bull, (2008), 56, PP. 897-901.

[12] Jain Upendra K., Bhatia Richa K., Akkipendly R. Rao, Ranjit Singh, SaxenaAjit K. And Seha Irun, Design and DevelopmentofHelogenatedChalconederavatives as potential anticancer Agents, Tropical Journal of pharmaceutical Research, January 2014: 13 (1), 73-80.

[13] Gaikwad Prajakta P., Desai Maya T., Liquid crystalline phase and its Pharma Application, International journal of Pharma Research and Review, Dec. (2013); 2 (12): 40-52.

[14] Doshi et al (i) Suthar D. M. and Doshi A. V., Mol. Cryst. Liq. Cryst. Vol. 575, PP 76-83. (ii) Chauhan H. N. and Doshi A. V., Mol. Cryst. Liq. Cryst. Vol. 570, PP. 92-100 (2013).

[15] D. Demus, 100 years of liquid crystal chemistry, Mol. Cryst. Liq., 165 (1988) PP. 45-84.

[16] Imrie, C. T. and Luckhrust,G. R., "Liquid Dimers and oligomers in handbook of Liquid crystal, low molecular liquid crystals; Vol. 28, Demus, D., Goodby, J. W., Gray G. W., Spiess, H. and V. Villeds, Willey-VCH weinhe 1998, PP-801-833.

[17] Demus, D., Plenary Lectures 100 years of liquid crystals chemistry, Thermotropic liquid crystals with conventional and unconventional molecular structures, Liq. Cryst. 5 (1998). PP. 75-110.

[18] Suthar, D. M., Doshi A. A and Doshi A. V., Study of liquid crystalline state and evaluation of its properties through a novel Homologous series, Mol. Cryst. Liq. Cryst. Vol. 582, PP. 79-87, (2013).

[19] Aurangzeb Hasan, Asghar Abbas, Muhammed Nadeem Akhtar., Molecule 16, 7789-7802 (2011).

[20] Nikitin K.V., Andryukhova N.P., Can.J. Chem., 82, 571, (2004).

[21] Furniss, B.S., Hannford, A. J., Smith, P. W.G., andTatchell, A. R. (Revisors). (1989). Vogel's Textbook of Practical Organic Chemistry (4thEdn. ), longmann Singapore Publishers Pvt. Ltd.: Singapore, PP. 563-649.

[22] Rabhasia P.K. and Bhoya U.C., DOI: 101080/15421406, 1068994 paper accepted for publication in Mol. Cryst. Liq. Cryst., (2015).

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Cited By:

[1] V. Sharma, R. Patel, "Synthesis and mesomorphic properties of new chalconyl-linkage-based liquid crystal compounds: The effect of flexibility", Molecular Crystals and Liquid Crystals, Vol. 643, p. 129, 2017


[2] 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


[3] V. Sharma, R. Patel, "Synthesis and study of mesomorphic properties in rod-like chalconyl compounds", Molecular Crystals and Liquid Crystals, Vol. 643, p. 52, 2017


[4] 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

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