The determination of the conformation of the aromatic rings in a lateral fluoro-substituted liquid crystal by 13C NMR spectroscopy
| Autor: | Franca Castiglione, M. Hird, J. M. Street, J. W. Emsley |
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| Jazyk: | angličtina |
| Rok vydání: | 2002 |
| Předmět: |
Crystallography
Liquid crystal Chemistry Carbon-13 NMR satellite Yield (chemistry) Phase (matter) General Physics and Astronomy Transverse relaxation-optimized spectroscopy Aromaticity Nuclear magnetic resonance crystallography Nuclear magnetic resonance spectroscopy Physical and Theoretical Chemistry |
| Popis: | A 13C–{1H} NMR spectrum of 2,2′-difluoro-4″-hexoxy-4-pentyl-[1,1′∶4′,1″]-terphenyl in the nematic phase has been obtained and analysed to yield a set of partially-averaged dipolar couplings, DCFij, which are used to determine the relative conformation of the two fluorinated rings. The probability distribution for the inter-ring angle is found to be peaked at 47.5±2.5° and 122.5±2.5°. The integrated, normalised probability that the inter-ring angle is less than 90° is 0.43. |
| Databáze: | OpenAIRE |
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