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A comparison of proton-detected C-13 local field experiments with deuterium NMR at natural abundance for studying liquid crystals

Emsley, J.W., Lesot, P., De Luca, G., Lesage, A., Merlet, D. and Pileio, G. (2008) A comparison of proton-detected C-13 local field experiments with deuterium NMR at natural abundance for studying liquid crystals Liquid Crystals, 35, (4), pp. 443-464. (doi:10.1080/02678290801935887).

Record type: Article

Abstract

A comparison is made between the information which can be derived on structure, conformation and orientational order of the molecules in a nematic liquid crystal 4-pentyl-4'-cyanobiphenyl (5CB) from the NMR spectra of the deuterium atoms at natural abundance (NAD NMR), and the two-dimensional proton-detected 13C local field experiment (PDLF). The nine residual quadrupolar splittings, ?? k , obtained experimentally have been compared with quadrupolar tensors and a geometry and conformational potentials calculated by the DFT method B3LYP/6-311G**. The PDLF experiment yielded 42 scaled 13C-1H residual dipolar couplings, kD CiHj . The scaling factor, k, is determined experimentally by comparing unscaled and scaled residual dipolar couplings in a sample of fluorobenzene dissolved in a nematic liquid crystalline solvent. The corrected residual dipolar couplings, D CiHj , are used to investigate the structure and rotational potentials about each bond in the molecule.

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More information

Published date: 4 April 2008
Keywords: angle, orientational order, couplings, dipolar, 4-n-pentyl-4'-cyanobiphenyl, phases, proton-detected c-13 local field experiment, abundance, conformational distribution, correlation spectroscopy, solvent, molecular structure determinations, spectral-analysis, deuterium nmr at natural

Identifiers

Local EPrints ID: 54447
URI: http://eprints.soton.ac.uk/id/eprint/54447
ISSN: 1358-314X
PURE UUID: 1f05b456-6f4d-4573-bc07-056003555f2f
ORCID for G. Pileio: ORCID iD orcid.org/0000-0001-9223-3896

Catalogue record

Date deposited: 05 Aug 2008
Last modified: 17 Jul 2017 14:35

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Contributors

Author: J.W. Emsley
Author: P. Lesot
Author: G. De Luca
Author: A. Lesage
Author: D. Merlet
Author: G. Pileio ORCID iD

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