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2 H NMR spectroscopy of liquid crystals: Structure and orientational order of a chiral smectogen as a model compound of side‐group LC polymers
Author(s) -
Catalano Donata,
Chiezzi Leonardo,
Domenici Valentina,
Geppi Marco,
Veracini Carlo Alberto,
Dong Ronald Y.,
Csorba Katalin Fodor
Publication year - 2002
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(200207)203:10/11<1594::aid-macp1594>3.0.co;2-p
Subject(s) - liquid crystal , pendant group , moiety , chemistry , carboxylate , molecule , crystallography , side chain , nuclear magnetic resonance spectroscopy , polymer , conformational isomerism , spectroscopy , deuterium nmr , phase (matter) , stereochemistry , polymer chemistry , materials science , organic chemistry , physics , optoelectronics , quantum mechanics
2 H 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.Molecular structure of ( S )‐[4‐(2‐methylbutyl)phenyl]‐4′‐ n ‐octylbiphenyl carboxylate.