Influence of moieties and chain length on the abundance of orthogonal and tilted phases of linear hydrogen-bonded liquid crystals, Py16BA

nOBAs

Sangeetha G. Bhat, M. Srinivasulu, S. R. Girish, Padmalatha, Poornima Bhagavath, S. Mahabaleshwara, D. M. Potukuchi, M. Muniprasad

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

A novel series of linear hydrogen-bonded (HB) liquid crystalline (LC) complexes (HBLCs), namely Py16BA:noBAs, is reported. The series was prepared by the complexation of a novel non-mesogenic proton acceptor moiety, namely (4-pyridyl)-benzylidene-4-n-hexadecyl aniline (Py16BA), with a mesogenic proton donor, p-n-alkoxy benzoic acid (noBAs for n = 3, 4, 5, 6, 7, 8, 9, and 12) moieties. Formation of HB complexes is confirmed through FTIR spectra. The LC phases exhibited by Py16BA:noBAs, the transition temperatures (T c), and the heat of transition (enthalpy) (H) are determined by polarizing optical microscope (POM) and differential scanning calorimetry (DSC) techniques. A comparative study of phase abundance is presented (with respect to the HB complexes of pure noBAs). An orthogonal smectic-A phase is induced by quenching the nematic phase in the lower homologs, while a quasi-2D tilted smectic-F phase is induced in the intermediate (or higher) homologs Py16BA:noBAs. The odd-even effect is observed across the isotropic-LC phase and LC-solid phase transitions. Overall mesogenic stability is enhanced. Optimization of the tilted smectic phase stability is discussed in the wake of the configuration of hydrogen bonding and the steric intrusion due to the increase in length of the flexible end-chain. Based on the extrapolation of the odd-even effect, an ACBF multi-critical point is predicted in the phase diagram in the vicinity of intermediate homologs, possibly in a binary of Py16BA:5oBA and Py16BA:6oBA.

Original languageEnglish
Pages (from-to)83-96
Number of pages14
JournalMolecular Crystals and Liquid Crystals
Volume552
DOIs
Publication statusPublished - 01-01-2012

Fingerprint

Liquid Crystals
Chain length
Liquid crystals
Hydrogen
liquid crystals
Crystalline materials
Liquids
hydrogen
liquids
Protons
Benzoic Acid
Phase stability
protons
Benzoic acid
benzoic acid
Aniline
aniline
Complexation
optical microscopes
intrusion

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

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title = "Influence of moieties and chain length on the abundance of orthogonal and tilted phases of linear hydrogen-bonded liquid crystals, Py16BA: nOBAs",
abstract = "A novel series of linear hydrogen-bonded (HB) liquid crystalline (LC) complexes (HBLCs), namely Py16BA:noBAs, is reported. The series was prepared by the complexation of a novel non-mesogenic proton acceptor moiety, namely (4-pyridyl)-benzylidene-4-n-hexadecyl aniline (Py16BA), with a mesogenic proton donor, p-n-alkoxy benzoic acid (noBAs for n = 3, 4, 5, 6, 7, 8, 9, and 12) moieties. Formation of HB complexes is confirmed through FTIR spectra. The LC phases exhibited by Py16BA:noBAs, the transition temperatures (T c), and the heat of transition (enthalpy) (H) are determined by polarizing optical microscope (POM) and differential scanning calorimetry (DSC) techniques. A comparative study of phase abundance is presented (with respect to the HB complexes of pure noBAs). An orthogonal smectic-A phase is induced by quenching the nematic phase in the lower homologs, while a quasi-2D tilted smectic-F phase is induced in the intermediate (or higher) homologs Py16BA:noBAs. The odd-even effect is observed across the isotropic-LC phase and LC-solid phase transitions. Overall mesogenic stability is enhanced. Optimization of the tilted smectic phase stability is discussed in the wake of the configuration of hydrogen bonding and the steric intrusion due to the increase in length of the flexible end-chain. Based on the extrapolation of the odd-even effect, an ACBF multi-critical point is predicted in the phase diagram in the vicinity of intermediate homologs, possibly in a binary of Py16BA:5oBA and Py16BA:6oBA.",
author = "Bhat, {Sangeetha G.} and M. Srinivasulu and Girish, {S. R.} and Padmalatha and Poornima Bhagavath and S. Mahabaleshwara and Potukuchi, {D. M.} and M. Muniprasad",
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Influence of moieties and chain length on the abundance of orthogonal and tilted phases of linear hydrogen-bonded liquid crystals, Py16BA : nOBAs. / Bhat, Sangeetha G.; Srinivasulu, M.; Girish, S. R.; Padmalatha, ; Bhagavath, Poornima; Mahabaleshwara, S.; Potukuchi, D. M.; Muniprasad, M.

In: Molecular Crystals and Liquid Crystals, Vol. 552, 01.01.2012, p. 83-96.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Influence of moieties and chain length on the abundance of orthogonal and tilted phases of linear hydrogen-bonded liquid crystals, Py16BA

T2 - nOBAs

AU - Bhat, Sangeetha G.

AU - Srinivasulu, M.

AU - Girish, S. R.

AU - Padmalatha,

AU - Bhagavath, Poornima

AU - Mahabaleshwara, S.

AU - Potukuchi, D. M.

AU - Muniprasad, M.

PY - 2012/1/1

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N2 - A novel series of linear hydrogen-bonded (HB) liquid crystalline (LC) complexes (HBLCs), namely Py16BA:noBAs, is reported. The series was prepared by the complexation of a novel non-mesogenic proton acceptor moiety, namely (4-pyridyl)-benzylidene-4-n-hexadecyl aniline (Py16BA), with a mesogenic proton donor, p-n-alkoxy benzoic acid (noBAs for n = 3, 4, 5, 6, 7, 8, 9, and 12) moieties. Formation of HB complexes is confirmed through FTIR spectra. The LC phases exhibited by Py16BA:noBAs, the transition temperatures (T c), and the heat of transition (enthalpy) (H) are determined by polarizing optical microscope (POM) and differential scanning calorimetry (DSC) techniques. A comparative study of phase abundance is presented (with respect to the HB complexes of pure noBAs). An orthogonal smectic-A phase is induced by quenching the nematic phase in the lower homologs, while a quasi-2D tilted smectic-F phase is induced in the intermediate (or higher) homologs Py16BA:noBAs. The odd-even effect is observed across the isotropic-LC phase and LC-solid phase transitions. Overall mesogenic stability is enhanced. Optimization of the tilted smectic phase stability is discussed in the wake of the configuration of hydrogen bonding and the steric intrusion due to the increase in length of the flexible end-chain. Based on the extrapolation of the odd-even effect, an ACBF multi-critical point is predicted in the phase diagram in the vicinity of intermediate homologs, possibly in a binary of Py16BA:5oBA and Py16BA:6oBA.

AB - A novel series of linear hydrogen-bonded (HB) liquid crystalline (LC) complexes (HBLCs), namely Py16BA:noBAs, is reported. The series was prepared by the complexation of a novel non-mesogenic proton acceptor moiety, namely (4-pyridyl)-benzylidene-4-n-hexadecyl aniline (Py16BA), with a mesogenic proton donor, p-n-alkoxy benzoic acid (noBAs for n = 3, 4, 5, 6, 7, 8, 9, and 12) moieties. Formation of HB complexes is confirmed through FTIR spectra. The LC phases exhibited by Py16BA:noBAs, the transition temperatures (T c), and the heat of transition (enthalpy) (H) are determined by polarizing optical microscope (POM) and differential scanning calorimetry (DSC) techniques. A comparative study of phase abundance is presented (with respect to the HB complexes of pure noBAs). An orthogonal smectic-A phase is induced by quenching the nematic phase in the lower homologs, while a quasi-2D tilted smectic-F phase is induced in the intermediate (or higher) homologs Py16BA:noBAs. The odd-even effect is observed across the isotropic-LC phase and LC-solid phase transitions. Overall mesogenic stability is enhanced. Optimization of the tilted smectic phase stability is discussed in the wake of the configuration of hydrogen bonding and the steric intrusion due to the increase in length of the flexible end-chain. Based on the extrapolation of the odd-even effect, an ACBF multi-critical point is predicted in the phase diagram in the vicinity of intermediate homologs, possibly in a binary of Py16BA:5oBA and Py16BA:6oBA.

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