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General Chemistry ›› 2018, Vol. 4 ›› Issue (2): 180010-180010.DOI: 10.21127/yaoyigc20180010

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Mesogenic Terminal Naphthyl Derivatives with Azomethine/Azo and Ester Central Linkages

H. N. Patel.a, A. K. Prajapatib*()   

  1. a Shree Maneklal M. Patel Institute of Sciences & Research, Sector 15/23, Gandhinagar, Kadi Sarva Vishwavidhyalaya, Gandhinagar, India;
    b Department of Chemistry, Faculty of Science, The M. S. University of Baroda, Vadodara-390002, India
  • Received:2018-03-31 Accepted:2018-04-24 Online:2018-06-27 Published:2018-06-27
  • Contact: A. K. Prajapati

Abstract: Two new mesogenic homologous series of naphthalene with different central linkages: (E)-naphthalen-2-yl 4-(4-n-alkoxybenzylideneamino)benzoate (I) and (E)-naphthalen-2-yl 4-(4-n-alkoxyphenylazo)benzoate (II) have been synthesized and characterized by a combination of elemental analysis and standard spectroscopic methods. In series I, all the twelve synthesized compounds exhibit mesomorphism. Methoxy to n-tetradecyloxy derivatives exhibit enantiotropic nematic mesophase. The SmA mesophase commences from n-pentyloxy derivative as an enantiotropic and persists up to the n-hexadecyloxy homologue synthesized. In series II, all the twelve synthesized compounds exhibit enantiotropic nematic mesophase. SmA mesophase commences from n-heptyloxy as monotropy and persist up to the n-hexadecyloxy homologous synthesized. The mesomorphic properties of present series were compared with each other and with a structurally related mesogenic homologous series to evaluate the effects of central linkage on mesomorphism.

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