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- W1998649875 abstract "Les spectres RMN des monochloro-, monobromo- et monofluoroacétone orientées dans une phase nématique ont été interprétés et les constantes de couplage dipolaire mesurées. La barrière s'opposant à la libre rotation du groupement CH2F a été étudiée pour le composé fluoré à l'aide de différentes hypothèses. En utilisant une répartition de Boltzmann pour peupler les différentes conformations du groupement CH2F, et une fonction potentielle de la forme V(θ) = Σn Vn(1 – cos n θ)/2, on obtient un bon accord avec les résultats d'infra-rouge pour V1 = 250 ± 50 cal.mol−1, V2 = 1650 ± 100 cal.mol−1, V3 = −1000 ± 100 cal.mol−1. The NMR spectra of monochloro-, monobromo- and monofluoroacetone (CH3COCH2X with X = Cl, Br, F) oriented in a nematic phase have been measured and the direct dipolar coupling constants determined. The barrier to internal rotation for the CH2F group has been studied for fluorine compound using various hypotheses. The best agreement with IR data has been obtained using the potential equation V(θ) = Σn Vn × (1 – cos nθ)/2 and a Boltzmann distribution of the CH2F group (V1 = 250 ± 50 cal.mol−1, V2 = 1650 ± 100 cal.mol−1, V3 = −1000 ± 100 cal.mol−1)." @default.
- W1998649875 created "2016-06-24" @default.
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- W1998649875 date "1974-01-01" @default.
- W1998649875 modified "2023-10-18" @default.
- W1998649875 title "Résonance Magnétique Nucléaire en phase nématique. Exploration de la barrière d'empêchement à la libre rotation de la monofluoroacétone" @default.
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- W1998649875 doi "https://doi.org/10.1002/mrc.1270060105" @default.
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