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Induced Crystal G phase through Intermolecular Hydrogen bonding in nOBA: 9HB

Author Affiliations

  • 1Department of Physics, Acharya Nagarjuna University, Nagarjunanagar, INDIA
  • 2 Gitam University-Hyderabad campus, Rudraram village, Patancheru (Mandal) Medak Dist, AP, INDIA
  • 3 Faculty of Science, University Tunku Abdul Rahman, Jalan University, Bandar Barat, Kampar, MALAYASIA

Res. J. Physical Sci., Volume 1, Issue (6), Pages 1-10, July,4 (2013)

Abstract

In this present communication, a novel homologous series of supra molecular liquid crystal complexes essentially with long axis is prepared through the formation of hydrogen bonding between mesogenic compounds p,n-alkoxybenzoic acid (nOBA, wheren= 5 to10) and nonmesogenic compound nonylp-hydroxy benzoate (9HB). The formation of hydrogen bonding is confirmed by Fourier Transform Infrared (FTIR) spectroscopy. Thermal and Phase behavior of all complexes are investigated by Polarizing Optical Microscope (POM) and Differential Scanning Calorimetry (DSC). Thermal analysis studies reveal-enantiotropic-crystal G phase with wide thermal span is induced for the entire homologous series of liquid crystal complexes by quenching the nematic phase (n =5 to 10) and smectic C (n = 7 to 10) phase. Molecular structure of the liquid crystal complexes, in the solid phase was elucidated using powdered x-ray diffraction and proton nuclear magnetic resonance HNMR. Two higher member mesogens of the present homologous series exhibit the monotropic crystal 2 phase. The average thermal stability, mesomorphic characteristics and structural behaviors are compared between present liquid crystal complexes of p,n-alkoxy benzoic acids and similar homologous series p,n-alkyl benzoic acids (nBA, where n =5 to 10).

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