Study of the Orientational Order and Dynamics in the Nematic and Smectic Phases ofp′-Hexyloxybenzyliden-p-Fluoroaniline by Means of2H-NMR
作者:
Claudia Forte,
Concetta Gandolfo,
Marco Geppi,
CarloAlberto Veracini,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 1995)
卷期:
Volume 266,
issue 1
页码: 213-227
ISSN:1058-725X
年代: 1995
DOI:10.1080/10587259508033644
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Measurements of orientational order parameters and spectral densities of motion in the nematic, smectic A and smectic B phases ofp′- hexyloxybenzyliden-p-fluoroaniline, fully deuterated in the chain and partially deuterated in the aniline ring, are reported. The deuterium spin-lattice (T1Z) and quadrupolar (T1Q) relaxation times have been measured at 46.04 MHz using a broadband multiple pulse Jeener-Broekaert sequence. The orientational order of the C-D bonds and the spectral densities determined suggest that, on entering the highly ordered smectic phases, the internal motions of the first two methylene groups in the chain slow down sensibly. These effects are discussed within the framework of the models used to describe molecular and internal dynamics in mesomorphic phases.
点击下载:
PDF (638KB)
返 回