2H NMR spectroscopy of liquid crystals: Structure and orientational order of a chiral smectogen as a model compound of side-group LC polymers

Donata Catalano, Leonardo Chiezzi, Valentina Domenici, Marco Geppi, Carlo Alberto Veracini, Ronald Y. Dong, Katalin Fodor Csorba

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

2H NMR spectroscopy is employed to investigate the orientational order, molecular structure and phase transitions of the chiral smectic liquid crystal (S)-[4-(2- methylbutyl)phenyl]-4′-octylbiphenyl carboxylate (8BEF5), partially deuterated in both the chiral chain and the phenyl moiety. 8BEF5 shows a rich polymorphism; the following phases have been observed: Blue phase, N* SmA, SmC*, SmI*, SmF*, SmJ* and SmG* phases. The tilt angle and the orientational order of the phenyl fragment has been investigated throughout the mesophasic range; the additive potential method has been applied in the SmA phase in order to obtain the order parameter of the "average" conformer of the whole molecule.

Original languageEnglish
Pages (from-to)1594-1601
Number of pages8
JournalMacromolecular Chemistry and Physics
Volume203
Issue number10-11
DOIs
Publication statusPublished - Jul 29 2002

Keywords

  • Average conformer
  • Liquid-crystalline polymers (LCPs)
  • NMR
  • Orientational order
  • Tilt angle

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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