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International Letters of Chemistry, Physics and Astronomy
ILCPA Volume 64

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Study of the Effects of Lateral Substitution (Bromo) on Mesomorphic Behaviours of Chalconyl Ester Derivatives

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Novel homologous series: RO-C6H4-COO-C6H3-Br-CO-CH=CH-C6H4-OC18H3 (n) (ortho bromo to –COO-) is synthesized and studied with a view to understand and establish the relation between mesomorphic properties and the molecular structure with reference to lateral substitution of bromine (-Br) at middle phenyl ring. Chalconyl homologous series consists of thirteen between (C1 to C18) homologues. Nematogenic mesomorphism commences from C5 homologue and continue up to C18 homologue in enantiotropic manner. Transition and melting points were determined by an optical polarizing microscopy (POM) equipped with a heating stage. Textures of nematic phase are threaded or schlieren. Transition curve Cr-N/I behaved in normal manner. N-I transition curve exhibited odd-even effect up to C8 homologue. It (N-I) rises and fall with negligible deviations from its normal descending tendency which appears in case of homologues C10 to C18. Thermal stability for nematic is 142.89 °C and the mesophase lengths vary minimum 8.0 °C to maximum 26.0 °C at the C7 and C8 homologue respectively. Liquid Crystal properties of present series are evaluated and compared with structurally analogous series and relative group efficiency order derived. Thus ,present series is predominantly nematogenic with absence of Smectic property. Analytical and spectral data supported moleculars of homologues.


International Letters of Chemistry, Physics and Astronomy (Volume 64)
R. Solanki and R.B. Patel, "Study of the Effects of Lateral Substitution (Bromo) on Mesomorphic Behaviours of Chalconyl Ester Derivatives", International Letters of Chemistry, Physics and Astronomy, Vol. 64, pp. 135-143, 2016
Online since:
February 2016

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

[2] S. Narmura. Advance LCD technologies, Display 22(1)(2001)PP. 1.

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

[4] Dr.L.K. Omray, current trend in tech. and sci. vol. II, Issue VI PP 347-352.

[5] Imaran Tadwee, Dr. sahanashahi, Vivek Ramtake, Iftequr Syed, Liquid Crystal Pharmaceutical Application: A review, IJRAS, ISSN2277-36. Vol. 1Issue2(2012), 06-11.

[6] C.A. Calliste, J.C. Le Bail, P. Trouilas, C. Poug, A.J. Chulia, L.J. Durox, Anticancer, Res. 2001, 21, 3949-3956.

[7] G.W. Gray, Molecular Structure and properties of Liquid crystal and plastic crystal, chepter-6. 2, The role of liquid crystal in life processes by G.T. Stewart, Vol -1, PP. 308-326.

[8] C.T. Imrie, Liq. Crystal dimers. Struct. Bond 95(1999) PP. 149-192.

[9] G.W. Gray (1974) In; G.W. Gray and P.A. Winsor (eds) Liquid crystal and Plastic Crystal, Chapter-4, Volume-1, PP-103-153.

[10] G.W. Gray and Molecular Structures and properties of liquid crystals, Academic press Landon, (1962).

[11] P.A. Henderson, O. Niemeyer, and C.T. Imrie, Methylene-linked liquid crystal dimers, Liq. Cryst 28 (2001), pp.463-472.

[12] Hird. M, Tyone. K. J, and Gray.G. W, Day S. E and Mc. Donell D.G. (1993), Liq. Cryst. 15, PP123.

[13] P.J. Collings and M. Hird (1997), Introduction of Liquid crystal chemistry and physics, Taylor and Fransis Ltd U.K. (1998).

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

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

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

[17] D. Demuse, 100 Years of liquid crystal chemistry, mol. cryst. liq. cryst. 165 (1988) PP. 45-84.

[18] D. Demuse, Plenary lectures 100 years of liquid crystal chemistry, Thermotropic liquid crystals with conventional and unconventional molecular structures, Liq. Cryst, 5 (1988) PP. 75-110.

[19] C. T imrie and G.R. Luckhrust, "Liquid Dimers and Oligomers in handbook of Liquid crystal, law molecular liquid crystal; Vol. 2B, D. Demuse, J.W. Goodby, G.W. Graw, H. Spiess and V. Vill eds, Willey-VCH weinhe 1998, pp-801-833.

[20] D.M. Suthar, A.A. Doshi and A.V. Doshi. 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).

[21] Patel B. H & Doshi A. V synthesis and Liquid Crystal Properties of a Novel Homologous Series 4-(4`-n- Alkoxy benzoyloxy) Benzyl Benzoates, Mol. Cryst. Liq. Cryst. , Vol- 605, PP. 61-69. (2015).

[22] Patel B. H & Doshi A. V Mesomorphism and Molecular Structure: Novel Homologous Series 4-(4`-n- Alkoxy cinnamoyloxy) – 4``- methoxy Benzyl Benzoates, Mol. Cryst. Liq. Cryst. , Vol- 607, PP. 78-86. (2015).

[23] (A) Rajesh B. Marathe, N.N. Vyas and Doshi A.V. Molecular Flexibility Operated Mesomorphism" ILCPA, Scipress Ltd, VOL-52. PP-163-171. (2015).

[24] 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.

[25] Patel, R. B., Patel, V. R., & Doshi, A. V. (2012). Mol. Cryst. Liq. Cryst., 552, 3-9. Chaudhary R. P., Doshi. A. V., Der Pharma Chemica 2012, 4(3): 1113-1119.

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

[27] Doshi. A.V. , Bhoya. U.C., and Travadi. J.J., ˝Determination of Transition Temperatures of Non mesomorphs by extrapolation method in binary systems ˝Mol. cryst. Liq. Cryst Vol. 552, PP. 10-15, (2012).

[28] Bhoya. U.C., Vyas. N.N., and Doshi. A.V., Determination of Latent Mesogenic behaviour in Nonmesogenic Compound by extrapolation˝Mol. Cryst. Liq. Cryst. Vol552, PP. 104-110, (2012).

[29] K.J. Ganatra and A.V. Doshi, Study of Binary system including mesophase and determination of Letant Transition Temperature, Journal of Indian chem. Soc., Vol. 77, july-2000, PP- 322-325.

[30] Lohar. J.M., and Doshi. A.V., ̋ Study on mixed mesomoephism Determination of Latent transition Temperature(LTT) by extrapolation˝, Procedings of Indian Acad. Of Science Banglore, Vol. 105, No-3, June1993PP. 209-214.

[31] Solanki Ravindra, Sharma Vinay and Roshan Patel. entitled Dependance of Thermotropic Mesomorphism on Molecular Flexible of Changing Tail Group., Manuscript Accepted in Mol. Cryst. Liq. Cryst. with its date of acceptance 22nd may (2015).

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