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Article Dans Une Revue The Journal of physical chemistry Année : 1994

Multiple-pulse COSY NMR spectroscopy of oriented molecules in thermotropic cholesteric

Résumé

The coherent reduction of anisotropic NMR interactions in molecules oriented in a thermotropic cholesteric phase, using a multiple-pulse COSY experiment, is described. The technique, which directly modifies the spin part of the nuclear spin Hamiltonian, allows the transformation of second-order spectra into first-order spectra. An experimental study of the evolution of the chemical shift and dipolar reduction factors is presented. The effects of the finite pulse duration in the multiple-pulse sequence are discussed, and explicit equations for the anisotropic interactions which take into account the pulse widths are obtained. The technique in cholesteric solvents is illustrated by using two specific examples for AB and ABC type of spectra: 2,6- dichloro-3-nitropyridine and 2-cyanofuran.

Dates et versions

hal-02309081 , version 1 (09-10-2019)

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Philippe Lesot, F. Nielsen, J. Ouvrard, J. Courtieu. Multiple-pulse COSY NMR spectroscopy of oriented molecules in thermotropic cholesteric. The Journal of physical chemistry, 1994, 98 (49), pp.12849-12855. ⟨10.1021/j100100a009⟩. ⟨hal-02309081⟩
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