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

Kumar, Ashok A V N and Sridevi, B and Srinivasulu, M and Chalapathi , P V and Potukuchi, D M (2013) Inductive effect for the phase stability in hydrogen bonded liquid crystals, x-(p/m)BA:9OBAs. Liquid Crystals, 41 (2). pp. 184-196. ISSN 1366-5855

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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.

Item Type: Article
Uncontrolled Keywords: hydrogen bonding; liquid crystals; inductive effect; phase stability; optical microscopy; calorimetry; textures
Subjects: Engineering > MIT Manipal > Chemistry
Depositing User: MIT Library
Date Deposited: 27 Jan 2015 09:15
Last Modified: 27 Jan 2015 09:15

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