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Proceedings Paper

Rotational potential of a chiral molecule around its long molecular axis in the Sc* phase of 4-(2'-methylbutyl)-4'-n-octylbiphenyl-4-carboxylate
Author(s): Zbigniew Raszewski; Jolanta Rutkowska; Jerzy Kedzierski; Pawel Perkowski; Wiktor Piecek; Jerzy Zielinski; Jozef Zmija; Roman S. Dabrowski
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Paper Abstract

Chiral 4-(2'-methylbutyl)-phenyl-4'-octylbiphenyl-4-carboxylate (CE8) has been studied by dielectric, densitometric, refractometric, and x-ray measurements. On the basis of these measurements the effective value of the molecular dipole moment ((mu) ), the angle between the vector of the molecular dipole moment and the long axis of molecule ((gamma) ) as well as the transverse ((alpha) t) and longitudinal ((alpha) 1) molecular polarizabilities have been calculated. In addition the sign and the magnitude of spontaneous polarization (Ps), the tilt angle ((Theta) ), and the helical pitch (gamma) have been measured for the same liquid crystal CE8. Knowing the molecular parameters (mu) , (gamma) , (alpha) t, (alpha) 1, and (Theta) from the experiment and the molecular structure from computer investigation, the spontaneous polarization Ps has been calculated as the vector sum of the components of molecular dipole moments (mu) perpendicular to the tilt direction. To do it the rotational potential given by B. Zeks has been used. According to this approximation, the measured spontaneous polarization Ps is induced by hindered rotation of the molecules around their long axes and is expressed by molecular parameters (mu) , (gamma) , (alpha) t, (alpha) 1, tilt angle (Theta) and the hindered rotation parameter (eta) . The hindered rotation parameter for CE8 shows that dipolar ordering in this smectic C* phase is rather weak in comparison to the strong orientational order of long molecular axes of the same phase.

Paper Details

Date Published: 2 August 1995
PDF: 10 pages
Proc. SPIE 2372, Liquid Crystals: Materials Science and Applications, (2 August 1995); doi: 10.1117/12.215545
Show Author Affiliations
Zbigniew Raszewski, Military Univ. of Technology (Poland)
Jolanta Rutkowska, Military Univ. of Technology (Poland)
Jerzy Kedzierski, Military Univ. of Technology (Poland)
Pawel Perkowski, Military Univ. of Technology (Poland)
Wiktor Piecek, Military Univ. of Technology (Poland)
Jerzy Zielinski, Military Univ. of Technology (Poland)
Jozef Zmija, Military Univ. of Technology (Poland)
Roman S. Dabrowski, Military Univ. of Technology (Poland)

Published in SPIE Proceedings Vol. 2372:
Liquid Crystals: Materials Science and Applications
Jozef Zmija, Editor(s)

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