Paper Titles in Periodical
International Letters of Chemistry, Physics and Astronomy
Volume 47

Subscribe

Subscribe to our Newsletter and get informed about new publication regulary and special discounts for subscribers!

ILCPA > Volume 47 > Dependence of Liquid Crystalline Behaviors on...
< Back to Volume

Dependence of Liquid Crystalline Behaviors on Molecular Flexibility

Full Text PDF

Abstract:

A novel homologous series of thermotropic liquid crystal (LC) has been synthesized with a view to understand and establish the effect of molecular structure on liquid crystal behaviors of a series. The present LC series consist of twelve homologues (C1 to C16); whose mesomorphic properties commence from octyloxy (C8) homologue of a series. C8, C10 and C12 members of a series are monotropic smectic and C14, C16 members are enantiotropically smectogenic. C1 to C7 homologues are nonmesomorphic. Nematogenic property is totally absent. Transition and melting temperatures are determined by an optical polarizing microscopy equipped with a heating stage. Textures of smectic mesophases are focal conic three or two dimensional networking of the type A or C. Cr-I/Sm and Sm-I or I-Sm transition curves behaved in normal manner. Analytical and spectral data confirms the molecular structures of homologues. Thermal stability of smectogenic mesophase is 100.6 oC and mesomorphic phase length is very short (12.9 °C to 15.3 oC). LC properties of a present novel series are compared with the structurally similar homologous series. Present series is partly smectogenic and partly non mesomorphic with poor degree of mesomorphism and middle ordered melting type without exhibition of nematogenic behavior.

Info:

Periodical:
International Letters of Chemistry, Physics and Astronomy (Volume 47)
Pages:
77-86
Citation:
S.A. Maheta et al., "Dependence of Liquid Crystalline Behaviors on Molecular Flexibility", International Letters of Chemistry, Physics and Astronomy, Vol. 47, pp. 77-86, 2015
Online since:
February 2015
Export:
Distribution:
References:

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

[2] Naemura, S. (2001). Advance LCD technologies, Displays, 22 (1), 1.

[3] Kim W.S., Elston, S.J., & Raynes, F.P. (2008). Display, 29, 458-463.

[4] Talwa, I., Dr. Salnana Shahi, Ramteke,V., & Syed, I., (2012). Liquid crystal Pharmaceutical Application: A Review", "IJPRAS, International journal of Pharmaceutical Research and Allied Science, 1(2), 06-11.

[5] Lee, Y.S., Lim, S.S., Shin, K.H., Kim, Y.S., Ohuchi, K. & Jung, S.H. (2006). Bio. Pharm. Bull, 29, 1028-1031.

[6] Imrie, C.T. (1999). Liquid crystal dimers, Structure, Bond, 95, 149-192.

[7] Gray, G. W., & Windsor, P.A. (1974). Liq. Cryst. Plastic Cryst., Ellis Horwood: Chichester, U.K., 1 (4), 103-153.

[8] Gray, G. W. (1962). Molecular Structure and the Properties of Liquid Crystal., Academic Press: London.

[9] Demls, D. (1988). 100 years of Liquid Crystal Chemistry, Mol. Cryst. Liq. Cry., 165, 45-84.

[10] Demus, D. (1989). Plenary lectures 100 years of Liquid Crystal Chemistry, Thermotropic liquid crystals with conventional and unconventional molecular structure, Liq. Cry., 5, 75-110.

DOI: https://doi.org/10.1080/02678298908026353

[11] Imrie, C.T. & Luckhrust, G.R. (1998). Liquid Crystal dimers and oligomers: Handbook of liquid crystal, law molecular liquid crystals, 2B, Demus,D., Goodly, J.W., Spiess, H.W. and Vill,V., willey-VCH, weinhei, 801-833.

DOI: https://doi.org/10.1002/9783527619276.ch7c

[12] (i) Suthar, D.M., & Doshi, A.V., (2013).

[13] Gray, G.W. & Jones, B. (1954). The effect of halogen substitution on the 4-alkoxy benzoic acid, Mesomorphism and chemical constitution part-III, J. of Chem. Soc., 2556-2562.

DOI: https://doi.org/10.1039/jr9540002556

[14] Hird, M., Toyne, K. J., Gray, G. W., Day, S. E., & Mc Donnell, D. G. (1993). Liq. Cryst., 15, 123.

[15] Collings, P.J., & Hird, M. (1998). Introduction to liquid crystals chemistry and physics, Taylor and Fransis Ltd, U. K.

[16] Marcos, M., Omenat, A., Serrano, J. L. & Ezcurra, A. (1992). Adv. Mater., 4, 285.

[17] Hird, M., Toyne, K. J., & Gray, G. W. (1993). Liq. Cryst., 14, 741.

[18] Dave, J. S., & Vora, R. A., (1970). Liquid Crystal and Ordered Fluids, Plenum Press: New York, Graw, G. W. (1958). Steric effect in conjugated systems. Ed., Butterworths, London, 477.

[19] Dave, J. S., & Vora, R. A., (1970). In: J.F. Johnson and R.S. Porter, (Eds), Liquid Crystal and Ordered Fluids, Plenum Press: New York, 477.

[20] Nagaveni, N.G., & Prasad, V., (2013). Azo substituted V-shaped liquid crystalline compounds: synthesis and mesophase characterization, Phase Tran. 86, 12, 1227-1240.

DOI: https://doi.org/10.1080/01411594.2012.744837

[21] Chauhan, H. N., Vyas,N. N., & Doshi, A. V., (2013) Mol. Cryst. Liq. Cryst., 575, 96-103.

[22] Chauhan, M. L., & Doshi, A. V. (2007). J. Ind. Chem. Soc., 84, 774-776. (Received 01 January 2015; accepted 15 January 2015).

Show More Hide
Cited By:

[1] M. Khunt, V. Kotadiya, U. Bhoya, "Mesomorphism Dependence of Molecular Flexibility with Reference to Bromo Tail Group", Molecular Crystals and Liquid Crystals, Vol. 626, p. 31, 2016

DOI: https://doi.org/10.1080/15421406.2015.1106226

[2] G. Bhola, U. Bhoya, "Molecular structural flexibility dependence of mesomorphism through ortho-substituted bromo group", Molecular Crystals and Liquid Crystals, Vol. 630, p. 188, 2016

DOI: https://doi.org/10.1080/15421406.2016.1146941

[3] 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