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Proceedings Paper

Twisted nematic phases induced by atropoisomers
Author(s): Peter V. Shibaev; R. A. Vinokur; H.-J. Deussen; T. Bjornholm; K. Schaumburg
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Paper Abstract

The helical twisting power (HTP) of a homologies series of novel series of novel chiral binarphthol (BN) derivatives in open and bridged forms has been studied int ow different nematic solvents. The direct correlation between molecular structure and HTP was revealed: increasing the length of the substituents in 6,6' positions leads to the increasing of helical twisting power. Open-chain compounds display a significant decrease of twisting power on heating. The decrease of HTP is explained in terms of changing of the molecular conformation. The conformational properties of BN derivatives dissolved in a pentylcyanobiphenyl liquid crystalline (LC) matrix were determined by molecular dynamics simulation. Due to the influence of intermolecular interactions between the molecules of the LC matrix and the BN molecules, the conformations of the BN molecules in LC cell are found to change from transoid to cisoid on heating that results in decrease of observed HTP.

Paper Details

Date Published: 1 January 1998
PDF: 6 pages
Proc. SPIE 3319, Liquid Crystals: Chemistry and Structure, (1 January 1998); doi: 10.1117/12.301282
Show Author Affiliations
Peter V. Shibaev, Univ. of Copenhagen (United States)
R. A. Vinokur, Moscow State Univ. (Russia)
H.-J. Deussen, Univ. of Copenhagen (Denmark)
T. Bjornholm, Univ. of Copenhagen (Denmark)
K. Schaumburg, Univ. of Copenhagen (Denmark)

Published in SPIE Proceedings Vol. 3319:
Liquid Crystals: Chemistry and Structure
Marzena Tykarska; Roman S. Dabrowski; Jerzy Zielinski, Editor(s)

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