Inductive effect for the phase stability in hydrogen bonded liquid crystals, x-(p/m)BA: 9OBAs

A. V.N. Ashok Kumar, B. Sridevi, M. Srinivasulu, P. V. Chalapathi, D. M. Potukuchi

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


A new series of hydrogen bonded liquid crystal (HBLC) complexes, made up with substituted benzoic acids (BAs) and nonyloxy benzoic acid, viz., x-(p/m)BA:9OBAs are reported for x = F, Cl, Br and -CH3 substituted at para (p) or meta (m) positions of BA moiety. Proton nuclear magnetic resonance (1H-NMR) spectrum confirms the HBLC complex. Infra red (IR) spectrum confirms linear, double and complementary type of hydrogen bonding (HB) between x-(p/m)BAs and 9OBA. The liquid crystal (LC) phases are characterised by polarisation optical microscopy (POM) and differential scanning calorimetry (DSC) techniques. x-(p/m)BA:9OBA exhibit N, C and G LC phase variance. HB induces tilted phases and enhances LC phase stability. The influence of configuration, size, electronegativity, electron directing capacity and inductive nature of substituent (x) is investigated for the stability of LC phases. An overview of the LC phase data indicates predominant 'negative inductive effect' in HBLCs with electron withdrawing substituents. Inductive effect operates effectively for para substitutions. Results are discussed in the wake of reports in other HBLCs.

Original languageEnglish
Pages (from-to)184-196
Number of pages13
JournalLiquid Crystals
Issue number2
Publication statusPublished - 01-02-2014

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics


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