Mesomorphic thermal stabilities in supramolecular liquid crystals

Influence of the size and position of a substituent

Poornima Bhagavath, S. Mahabaleshwara, Sangeetha G. Bhat, D. M. Potukuchi, P. V. Chalapathi, M. Srinivasulu

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

A new homologous series of supramolecular Hydrogen Bonded Liquid Crystalline (HBLC) materials are synthesized with two low molar mass non-mesogenic moieties. The non-mesogenic substituted benzoic acids viz., 2-fluorobenzoic acid (2FBA), 3-fluorobenzoic acid (3FBA) and 4-fluorobenzoic acids (4FBA) are used as the proton donors. Non-mesogenic proton acceptors, PyBnA viz., (4-pyridyl)-benzylidene-4′-n-alkyl anilines (decyl, tetradecyl and hexadecyl) are used for the formation of supramolecular structures with the above proton donors. The HB between the two moieties is confirmed by FTIR spectroscopy. All the complexes exhibiting the smectic mesomorphism are characterized by Polarizing Optical Microscope (POM) equipped with a hot stage. Differential Scanning Calorimeter (DSC) is used to determine the enthalpy change across the mesomorphic phase transitions. The effect of position of fluorine atom and the chain length of proton acceptor on the mesomorphic stability is studied. The mesomorphic thermal stabilities and their melting/clearing temperatures are discussed in the wake of the data available on other supramolecular HBLCs with and without electronegative substituents on the proton donor moieties.

Original languageEnglish
Pages (from-to)56-62
Number of pages7
JournalJournal of Molecular Liquids
Volume186
DOIs
Publication statusPublished - 10-2013

Fingerprint

Liquid Crystals
Liquid crystals
Protons
Thermodynamic stability
thermal stability
liquid crystals
protons
acids
Acids
Aniline Compounds
clearing
Fluorine
Benzoic acid
Molar mass
Benzoates
benzoic acid
Aniline
aniline
optical microscopes
Calorimeters

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Cite this

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title = "Mesomorphic thermal stabilities in supramolecular liquid crystals: Influence of the size and position of a substituent",
abstract = "A new homologous series of supramolecular Hydrogen Bonded Liquid Crystalline (HBLC) materials are synthesized with two low molar mass non-mesogenic moieties. The non-mesogenic substituted benzoic acids viz., 2-fluorobenzoic acid (2FBA), 3-fluorobenzoic acid (3FBA) and 4-fluorobenzoic acids (4FBA) are used as the proton donors. Non-mesogenic proton acceptors, PyBnA viz., (4-pyridyl)-benzylidene-4′-n-alkyl anilines (decyl, tetradecyl and hexadecyl) are used for the formation of supramolecular structures with the above proton donors. The HB between the two moieties is confirmed by FTIR spectroscopy. All the complexes exhibiting the smectic mesomorphism are characterized by Polarizing Optical Microscope (POM) equipped with a hot stage. Differential Scanning Calorimeter (DSC) is used to determine the enthalpy change across the mesomorphic phase transitions. The effect of position of fluorine atom and the chain length of proton acceptor on the mesomorphic stability is studied. The mesomorphic thermal stabilities and their melting/clearing temperatures are discussed in the wake of the data available on other supramolecular HBLCs with and without electronegative substituents on the proton donor moieties.",
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Mesomorphic thermal stabilities in supramolecular liquid crystals : Influence of the size and position of a substituent. / Bhagavath, Poornima; Mahabaleshwara, S.; Bhat, Sangeetha G.; Potukuchi, D. M.; Chalapathi, P. V.; Srinivasulu, M.

In: Journal of Molecular Liquids, Vol. 186, 10.2013, p. 56-62.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Mesomorphic thermal stabilities in supramolecular liquid crystals

T2 - Influence of the size and position of a substituent

AU - Bhagavath, Poornima

AU - Mahabaleshwara, S.

AU - Bhat, Sangeetha G.

AU - Potukuchi, D. M.

AU - Chalapathi, P. V.

AU - Srinivasulu, M.

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N2 - A new homologous series of supramolecular Hydrogen Bonded Liquid Crystalline (HBLC) materials are synthesized with two low molar mass non-mesogenic moieties. The non-mesogenic substituted benzoic acids viz., 2-fluorobenzoic acid (2FBA), 3-fluorobenzoic acid (3FBA) and 4-fluorobenzoic acids (4FBA) are used as the proton donors. Non-mesogenic proton acceptors, PyBnA viz., (4-pyridyl)-benzylidene-4′-n-alkyl anilines (decyl, tetradecyl and hexadecyl) are used for the formation of supramolecular structures with the above proton donors. The HB between the two moieties is confirmed by FTIR spectroscopy. All the complexes exhibiting the smectic mesomorphism are characterized by Polarizing Optical Microscope (POM) equipped with a hot stage. Differential Scanning Calorimeter (DSC) is used to determine the enthalpy change across the mesomorphic phase transitions. The effect of position of fluorine atom and the chain length of proton acceptor on the mesomorphic stability is studied. The mesomorphic thermal stabilities and their melting/clearing temperatures are discussed in the wake of the data available on other supramolecular HBLCs with and without electronegative substituents on the proton donor moieties.

AB - A new homologous series of supramolecular Hydrogen Bonded Liquid Crystalline (HBLC) materials are synthesized with two low molar mass non-mesogenic moieties. The non-mesogenic substituted benzoic acids viz., 2-fluorobenzoic acid (2FBA), 3-fluorobenzoic acid (3FBA) and 4-fluorobenzoic acids (4FBA) are used as the proton donors. Non-mesogenic proton acceptors, PyBnA viz., (4-pyridyl)-benzylidene-4′-n-alkyl anilines (decyl, tetradecyl and hexadecyl) are used for the formation of supramolecular structures with the above proton donors. The HB between the two moieties is confirmed by FTIR spectroscopy. All the complexes exhibiting the smectic mesomorphism are characterized by Polarizing Optical Microscope (POM) equipped with a hot stage. Differential Scanning Calorimeter (DSC) is used to determine the enthalpy change across the mesomorphic phase transitions. The effect of position of fluorine atom and the chain length of proton acceptor on the mesomorphic stability is studied. The mesomorphic thermal stabilities and their melting/clearing temperatures are discussed in the wake of the data available on other supramolecular HBLCs with and without electronegative substituents on the proton donor moieties.

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