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.
|Autori:||Catalano, DONATA INES MARIA; Chiezzi, L.; Domenici, Valentina; Geppi, Marco; Veracini, CARLO ALBERTO; Dong, R. Y.; Fodorcsorba, K.|
|Titolo:||2H NMR spectroscopy of liquid crystals: structure and orientational order of a chiral smectogen as a model compound of side-group LC polymers|
|Anno del prodotto:||2002|
|Digital Object Identifier (DOI):||10.1002/1521-3935(200207)203:10/11<1594::AID-MACP1594>3.0.CO;2-P|
|Appare nelle tipologie:||1.1 Articolo in rivista|