Carbon-13 Study of Relaxation and Chemical Shifts in the Smectic Liquid Crystal 8CB
- 1 January 1985
- journal article
- research article
- Published by Taylor & Francis in Molecular Crystals and Liquid Crystals
- Vol. 122 (1) , 191-203
- https://doi.org/10.1080/00268948508074753
Abstract
The l3C chemical shifts and spin-lattice relaxation times were obtained for all the resolved resonances in the isotropic, nematic, and smectic phases of 8CB. NOE measurements were also obtained for the isotropic phase. A study of these data reveal some inconsistencies with dielectric and deuterium NMR studies, but general agreement with a 13C NMR study of 5CB. Discontinuities in relaxation times at both the nematic/isotropic and smectic/nematic phase transitions are observed for some of the carbon atoms. The difference between the components of the motionally averaged shielding tensor parallel and perpendicular to the long molecular axis is found for both the aromatic carbons and the first carbon of the octyl chain.Keywords
This publication has 7 references indexed in Scilit:
- 13C chemical shifts and spin-lattice relaxation in the nematic liquid crystal 4-cyano-4′-n-pentylbiphenylThe Journal of Chemical Physics, 1983
- Simplification of deuterium spectra of liquid crystals by the refocussing of proton–deuterium dipolar couplingsJournal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics, 1981
- Refractive indices and order parameters of two liquid crystalsJournal de Physique, 1978
- Dielectric Dispersion in 4′-n-Alkyl-4-CyanobiphyenylsMolecular Crystals and Liquid Crystals, 1977
- Molecular rotation in liquid crystals selective deuterium spin-lattice relaxation times in the nematic mesophase of 4-cyano-4′-d17-n-octylbiphenylMolecular Physics, 1976
- High Resolution NMR Spectroscopy in SolidsPublished by Springer Nature ,1976
- Study of the isotropic-nematic-solid transitions in a liquid crystal by carbon-13—proton double resonancePhysical Review A, 1974