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International Letters of Chemistry, Physics and Astronomy
Volume 64
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Study of the Effects of Decreasing Molecular Rigidity on Mesomorphism

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Abstract:

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-.

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Periodical:
International Letters of Chemistry, Physics and Astronomy (Volume 64)
Pages:
69-76
Citation:
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
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References:

[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

DOI: https://doi.org/10.1080/15421406.2016.1263112

[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

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

[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

DOI: https://doi.org/10.1080/15421406.2016.1262689

[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

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