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2016 | 40 | 199-210
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Dependence of Mesomorphism on meta Substituted Lateral Groups

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Thermotropic LC substances of chalconyl derivatives consisting of two phenyl rings, one chalconyl central bridge and two flexible {-OR and -OC7H15(n)} terminal (para) / lateral (meta) functional groups i.e. RO-C6H4-CH=CH-CO-C6H4-OC7H15(n) (meta) have been synthesized and studied for the effect of molecular structure on thermotropicmesomorphism. The thermometric behaviours of novel homologue substances and their textures were determined by an optical polarizing microscopy (POM) equipped with a heating stage. Textures of a nematic phases are threaded or schlieren. The textures of monotropicsmectic phase are directly judged from the heating top as smectic-A. Analytical, thermal and spectral data supports and conforms the molecular structures of homologues. Transition curves as depicted in a phase diagram behaves in normal manner. Odd-even effect for N-I transition curve (very short) is observed. Total (C1 to C18) thirteen homologues are synthesized .Mesomorphism commences from C7 homologue. C7 to C8 homologues are enantiotropicnematic and C10 to C18 homologues are monotropicllynematogenic plus smectogenic. Thermal stability of smectic phase is about fraction of 1.0 °C or 1.0 °C and that of nematic phase is 66.0 °C with total mesophaselength minimum to maximum 7.0 °C to 15 °C. Group efficiency order for mesophases is derived on the basis of thermal stabilities from the comparative study of thermometric data determined from structurally analogous series. Hence present novel series behaves in normal manner with very short mesophaselengths, low thermal stabilities and low melting type and predominantly nematogenic and partly smectogenic.
Physical description
  • Chemistry Department, K. K. Shah Jarodwala Maninagar Science College, Gujarat University, Ahmedabad, Gujarat, India
  • Chemistry Department, K. K. Shah Jarodwala Maninagar Science College, Gujarat University, Ahmedabad, Gujarat, India
  • [1] F. Reinitzer, Monatsh 9, 421, (1888).
  • [2] Narmura S., Advance LCD technologies, Display 22(1) (2001) 1.
  • [3] Kim W.S., Elston S.J., and Raynes F.P., Display 29 (2008) 458-463.
  • [4] Dr. L.K. Omray, Current trends in Technology and Science, Vol. II, Issue: VI, “ Liquid Crystals as novel vesicular delivery system , A review.
  • [5] G.W. Gray and P.A. Winster (Eds) Liquid Crystal and plastic crystals, chapter - 6.2, The role of liquid crystal in life processes by G.T. Stewart, Vol. 1, 308-326.
  • [6] Calliste C.A., Le Bail J.C., Trouilas P., Poug C., Chulia A.J., Duroux L.J., Anticancer Res. 2001, 21, 3949-3956.
  • [7] Jain Upendra K., Bhatia Rich K., RaoAkkinepally R., Ranjitsingh , SaxsenaAjit K and Sehalrun “ Design and Development of Halogenated Chalcone derivatives as potential anticancer Agents “ Tropical Journal of pharmaceutical Research , January 2014: 13(1), 73-80.
  • [8] GaikwadPrajkata P., Desai Maya T.. “Liquid crystalline phase and its Pharma application”, International journal of Pharma Research and Review, Dec. 2013; 2(12); 40-52.
  • [9] Imrie, C. T., Liq. Crystal dimers. Struct. Bond 95 (1999) 149-192.
  • [10] Gray G.W. (1974) ln; Gray G.W. and P.A.Winsor P.A. (eds) liquid crystal and plastic crystals, Chapter 4, Volume 1, 103-153.
  • [11] Gray G.W., Molecular Structure and properties of liquid crystals, Academic press, Landon, 1962.
  • [12] Henderson P.A. , Niemeyer O., and Imrie C.T., Methylene-linked liquid crystal dimmers, Liq. Cryst. 28 (2001) 463-472.
  • [13] Dermus D., 100 years of liquid crystals chemistry, Mol. Cryst. 165 (1998) 45-84.
  • [14] Dermus D., Plenary lectures 100 years of liquid crystals chemistry, Thermotropic liquid crystals with conventional and unconventional molecular structures, Liq. Cryst, 5 (1998) 75-100.
  • [15] lmrie C.T and Luckhrust G.R., “Liquid Dimers and Oligomers in handbook of Liquid Crystal, law molecular liquid crystals; Vol. 2B, Demus D. , Goodby J.W., Graw G.W. , Spiess H. and Vill V. eds, Willey-VCH weinhe 1998, 801-833.
  • [16] Doshi et al (i) Suthar D.M. and Doshi A.V., Mol. Cryst. Liq. Cryst., Vol. 575, 76-83. (ii) Chauhan H.N. and Doshi A.V., Mol.Cryst. Liq. Cryst., Vol. 570, 92-100 (2013). (iii) Chaudhari R.P. , . Chauhan M.L. and Doshi A.V., Mol. Cryst. Liq. Cryst., Vol. 575, 88-95 (2013).
  • (iv) Bhoya U.C. ,Vyas N.N. and Doshi A.V. , Mol. Cryst. Liq. Cryst., Vol. 552, 104-110. (2012).
  • [17] Marathe Rajesh B., Vyas N.N. and Doshi A.V., “Moleculer Flexibility Operated Mesomorphism” ILCPA, Scipress Ltd., Vol. 52, 163-171 (2015).
  • [18] Patel B.H. and Doshi A.V. “Mesomorphism and Molecular structure Novel Homologous series : 4-(4/-n-Alkoxybenzoyloxy) benzyl Cinnamates” , Mol.Cryst. Liq. Cryst., Vol. 607, 78-86, (20150.
  • [19] Suthar D.M., Doshi A.A. and Doshi A.V., “Synthesis of liquid crystalline state and evaluation of its properties through a novel Homologous series”, Mole. Cryst. Liq. Cryst. Vol. 582, 79-87, 2013.
  • [20] Hird. M, Toyne. K. J, and Gray G.W. , Day S.E and Mc. Donell D.G (1993). Liq. Cryst. 15, 123.
  • [21] Collings P.J. andHird M. (1997). Introduction of Liquid crystals chemistry and Physics, Taylor and Francis Ltd. U.K. 1998.
  • [22] Macros M, Omenat. A, Serrano J.L. and Ezcurra. A. (1992). Adv. Matter, 4, 285.
  • [23] Hird. M, Toyne. K.J, Gray G.W., Day S.E. (1993). Liq. Cryst.14,741.
  • [24] Aurangzeb Hasan, Asghar Abbas, Muhammed Nadeem Akhtar., Molecule 16, 7789-7802 (2011).
  • [25] Nikitin K.V., Andryukhova N.P., Can. J. Chem., 82, 571, (2004).
  • [26] 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, 563-649.
  • [27] B.B. Jain,Vinay S. Sharma and R.B. Patel, “Dependence of Molecular Flexibility of Lateral Group on Mesomorphism” Paper Submitted for Publication in ILCPA, Scipress Ltd dated 17th December 2015.
  • [28] Vinay S. Sharma, B.B. Jain and R.B. Patel “Dependance of Mesomorphism on Molecular Rigidity of Chalconyl Central Bridge Bonded to two Phenyl Rings”, Paper Submitted for Publication in ILCPA, Scipress Ltd dated 13th December 2015.
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