Determination of orientational order parameters for nematics by deuterium nuclear magnetic resonance. The influence of internal rotation
- 1 March 1979
- journal article
- research article
- Published by Taylor & Francis in Molecular Physics
- Vol. 37 (3), 959-972
- https://doi.org/10.1080/00268977900103311
Abstract
Deuterium N.M.R. spectra of 4,4′-dimethoxyazoxybenzene-d14 have been recorded over the entire temperature range of the nematic phase. Analysis of the spectra yield partially averaged quadrupolar tensors, [qtilde]i , and dipolar tensors, [Dtilde]ij , which are used to test models for the singlet orientational distribution function produced by both internal motion and reorientation of the molecule in the mesophase. It is argued that ratios of [qtilde] values reveal the inadequacy of descriptions of the mesophase as composed of axially symmetric, rigid particles. The data are interpreted in terms of a model for which the internal rotation about the phenyl-methoxy bonds is correlated with reorientation of the whole molecule.Keywords
This publication has 7 references indexed in Scilit:
- Determination of the ordering matrix for 4-cyano-4′-pentyl-d11-2′,3′,5′,6′-d4-biphenyl from proton dipolar couplingsMolecular Physics, 1978
- Anisole, acetophenone and benzoic acid methyl ester oriented in a nematic phase: Structure and internal motionMagnetic Resonance in Chemistry, 1977
- Deuteron line shape study of molecular order and conformation in the nematogens PAA and MBBAThe Journal of Chemical Physics, 1977
- Order in pure nematic liquid crystals as determined by N.M.R. of partially deuterated speciesMolecular Physics, 1975
- Introduction to Liquid CrystalsPublished by Springer Nature ,1975
- The crystal structure of p-azoxyanisoleActa Crystallographica Section B: Structural Science, Crystal Engineering and Materials, 1970
- Kernresonanzen in kristallinen Flüssigkeiten und in kristallinflüssigen Lösungen. Teil IZeitschrift für Naturforschung A, 1964