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Proceedings Paper

Orientational Ordering Of Phenylcyclohexane-Based Liquid Crystals Determined From Carbon-13 2D NMR Spectroscopy
Author(s): Cheryl Baldwin Frech; B. M. Fung; Martin Schadt
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Paper Abstract

The orientational ordering of eight liquid crystals in their nematic phase at TNI - T = 4 K and 10K was studied by carbon-13 NMR. The technique applied is a combination of separated local field spectroscopy (SLF) and variable angle spinning (VAS). Using this method, a first order splitting pattern for each carbon signal was obtained and C-H dipolar coupling constants were determined. Order parameters for each aliphatic C-H segment and each phenyl and cyclohexyl ring were calculated for the compounds. Results are presented for four 1-(4'-cyanophenyl)-trans-4-alkenylcyclohexanes and two of their analogous 1-(4'-cyanophenyl)-trans-4-alkylcyclohexanes, as well as a 1-(4'-isothiocyanophenyl)-trans-4-alkylcyclohexane and a 4-alkyl-4'-cyanobiphenyl for comparison. The effects of substitution of a phenyl group for a cyclohexyl group, the presence and position of a double bond, the length of the aliphatic chain, the nature of the phenyl-ring substituent, and temperature are discussed.

Paper Details

Date Published: 25 July 1989
PDF: 12 pages
Proc. SPIE 1080, Liquid Crystal Chemistry, Physics, and Applications, (25 July 1989); doi: 10.1117/12.976422
Show Author Affiliations
Cheryl Baldwin Frech, University of Oklahoma (United States)
B. M. Fung, University of Oklahoma (United States)
Martin Schadt, F. Hoffman-LaRoche & Co., Ltd. (Switzerland)

Published in SPIE Proceedings Vol. 1080:
Liquid Crystal Chemistry, Physics, and Applications
J. William Doane; Zvi Yaniv, Editor(s)

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