Influence of flexible chain, polar substitution and hydrogen bonding on phase stability in Shiff based (4)PyBD(4I)BrA-nOBA series of liquid crystals

A. V.S.N.Krishna Murthy, P. V. Chalapathy, M. Srinivasulu, M. L.N. Madhumohan, Y. V. Rao, D. M. Potukuchi

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Shiff based Linear Hydrogen Bonded Liquid Crystalline homologues, viz., (4)PyBD(4I)BrA-nOBAs for n = 2,3,4,5,6,7,8,10,11 and 12 are synthesized. 1H-NMR and 13C-NMR studies confirm the formation of HBLC and IR confirms the linear hydrogen bonding. Liquid crystal phase abundance, transition temperatures, enthalpy and order of transition are investigated by Polarized Optical Microscopy textural studies and Differential Scanning Calorimetry. Nematic, Smectic-A, -D, -C, Bhexatic, -BCrystal, -F, -I and –G phases are identified. Large LC phase variances, viz., NABhexFG and NACFG are exhibited by intermediate chain length with n = 5 and 6. A-C transition exhibited unique II-order nature. II-order nature for G-Solid transition explained. Phase diagram drawn with flexible chain length infers INA, and ACF and CIF MultiCritical Points and Lifshitz behaviour. NA TriCiritical Point predicted in [3+7] binary. Influences of chain length, linear HB and end polar(-Br) substitution for LC phase stability are is discussed. Results of Phase stability are discussed in the wake of the body of the data and reports in other LCs. DSC enthalpy suggests for utility of intermediate and higher homologues for device savvy tilted Smectic LC phases.

Original languageEnglish
Pages (from-to)46-68
Number of pages23
JournalMolecular Crystals and Liquid Crystals
Volume664
Issue number1
DOIs
Publication statusPublished - 24-03-2018

Fingerprint

Liquid Crystals
Phase stability
Chain length
Liquid crystals
Hydrogen bonds
Substitution reactions
liquid crystals
substitutes
Enthalpy
hydrogen
enthalpy
Nuclear magnetic resonance
nuclear magnetic resonance
wakes
Superconducting transition temperature
Phase diagrams
Optical microscopy
Hydrogen
Differential scanning calorimetry
heat measurement

All Science Journal Classification (ASJC) codes

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

Cite this

Murthy, A. V.S.N.Krishna ; Chalapathy, P. V. ; Srinivasulu, M. ; Madhumohan, M. L.N. ; Rao, Y. V. ; Potukuchi, D. M. / Influence of flexible chain, polar substitution and hydrogen bonding on phase stability in Shiff based (4)PyBD(4I)BrA-nOBA series of liquid crystals. In: Molecular Crystals and Liquid Crystals. 2018 ; Vol. 664, No. 1. pp. 46-68.
@article{6bae6ba41abd4c04adf9d35b9cea672d,
title = "Influence of flexible chain, polar substitution and hydrogen bonding on phase stability in Shiff based (4)PyBD(4I)BrA-nOBA series of liquid crystals",
abstract = "Shiff based Linear Hydrogen Bonded Liquid Crystalline homologues, viz., (4)PyBD(4I)BrA-nOBAs for n = 2,3,4,5,6,7,8,10,11 and 12 are synthesized. 1H-NMR and 13C-NMR studies confirm the formation of HBLC and IR confirms the linear hydrogen bonding. Liquid crystal phase abundance, transition temperatures, enthalpy and order of transition are investigated by Polarized Optical Microscopy textural studies and Differential Scanning Calorimetry. Nematic, Smectic-A, -D, -C, Bhexatic, -BCrystal, -F, -I and –G phases are identified. Large LC phase variances, viz., NABhexFG and NACFG are exhibited by intermediate chain length with n = 5 and 6. A-C transition exhibited unique II-order nature. II-order nature for G-Solid transition explained. Phase diagram drawn with flexible chain length infers INA, and ACF and CIF MultiCritical Points and Lifshitz behaviour. NA TriCiritical Point predicted in [3+7] binary. Influences of chain length, linear HB and end polar(-Br) substitution for LC phase stability are is discussed. Results of Phase stability are discussed in the wake of the body of the data and reports in other LCs. DSC enthalpy suggests for utility of intermediate and higher homologues for device savvy tilted Smectic LC phases.",
author = "Murthy, {A. V.S.N.Krishna} and Chalapathy, {P. V.} and M. Srinivasulu and Madhumohan, {M. L.N.} and Rao, {Y. V.} and Potukuchi, {D. M.}",
year = "2018",
month = "3",
day = "24",
doi = "10.1080/15421406.2018.1455315",
language = "English",
volume = "664",
pages = "46--68",
journal = "Molecular Crystals and Liquid Crystals",
issn = "1542-1406",
publisher = "Taylor and Francis Ltd.",
number = "1",

}

Influence of flexible chain, polar substitution and hydrogen bonding on phase stability in Shiff based (4)PyBD(4I)BrA-nOBA series of liquid crystals. / Murthy, A. V.S.N.Krishna; Chalapathy, P. V.; Srinivasulu, M.; Madhumohan, M. L.N.; Rao, Y. V.; Potukuchi, D. M.

In: Molecular Crystals and Liquid Crystals, Vol. 664, No. 1, 24.03.2018, p. 46-68.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Influence of flexible chain, polar substitution and hydrogen bonding on phase stability in Shiff based (4)PyBD(4I)BrA-nOBA series of liquid crystals

AU - Murthy, A. V.S.N.Krishna

AU - Chalapathy, P. V.

AU - Srinivasulu, M.

AU - Madhumohan, M. L.N.

AU - Rao, Y. V.

AU - Potukuchi, D. M.

PY - 2018/3/24

Y1 - 2018/3/24

N2 - Shiff based Linear Hydrogen Bonded Liquid Crystalline homologues, viz., (4)PyBD(4I)BrA-nOBAs for n = 2,3,4,5,6,7,8,10,11 and 12 are synthesized. 1H-NMR and 13C-NMR studies confirm the formation of HBLC and IR confirms the linear hydrogen bonding. Liquid crystal phase abundance, transition temperatures, enthalpy and order of transition are investigated by Polarized Optical Microscopy textural studies and Differential Scanning Calorimetry. Nematic, Smectic-A, -D, -C, Bhexatic, -BCrystal, -F, -I and –G phases are identified. Large LC phase variances, viz., NABhexFG and NACFG are exhibited by intermediate chain length with n = 5 and 6. A-C transition exhibited unique II-order nature. II-order nature for G-Solid transition explained. Phase diagram drawn with flexible chain length infers INA, and ACF and CIF MultiCritical Points and Lifshitz behaviour. NA TriCiritical Point predicted in [3+7] binary. Influences of chain length, linear HB and end polar(-Br) substitution for LC phase stability are is discussed. Results of Phase stability are discussed in the wake of the body of the data and reports in other LCs. DSC enthalpy suggests for utility of intermediate and higher homologues for device savvy tilted Smectic LC phases.

AB - Shiff based Linear Hydrogen Bonded Liquid Crystalline homologues, viz., (4)PyBD(4I)BrA-nOBAs for n = 2,3,4,5,6,7,8,10,11 and 12 are synthesized. 1H-NMR and 13C-NMR studies confirm the formation of HBLC and IR confirms the linear hydrogen bonding. Liquid crystal phase abundance, transition temperatures, enthalpy and order of transition are investigated by Polarized Optical Microscopy textural studies and Differential Scanning Calorimetry. Nematic, Smectic-A, -D, -C, Bhexatic, -BCrystal, -F, -I and –G phases are identified. Large LC phase variances, viz., NABhexFG and NACFG are exhibited by intermediate chain length with n = 5 and 6. A-C transition exhibited unique II-order nature. II-order nature for G-Solid transition explained. Phase diagram drawn with flexible chain length infers INA, and ACF and CIF MultiCritical Points and Lifshitz behaviour. NA TriCiritical Point predicted in [3+7] binary. Influences of chain length, linear HB and end polar(-Br) substitution for LC phase stability are is discussed. Results of Phase stability are discussed in the wake of the body of the data and reports in other LCs. DSC enthalpy suggests for utility of intermediate and higher homologues for device savvy tilted Smectic LC phases.

UR - http://www.scopus.com/inward/record.url?scp=85048863318&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85048863318&partnerID=8YFLogxK

U2 - 10.1080/15421406.2018.1455315

DO - 10.1080/15421406.2018.1455315

M3 - Article

AN - SCOPUS:85048863318

VL - 664

SP - 46

EP - 68

JO - Molecular Crystals and Liquid Crystals

JF - Molecular Crystals and Liquid Crystals

SN - 1542-1406

IS - 1

ER -