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Issue 1, 2007
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NMR measurements of scalar-coupling distributions in disordered solids

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The measurement of scalar (J) couplings by solid-state NMR is a field of great interest, since this interaction is a rich source of local structural information, complementary to dipolar and chemical shift interactions. Here, we first demonstrate that J-coupling distributions exist and can be observed in disordered solids, as illustrated with the observation of a pair-specific distribution of 2J(31P–N–31P) couplings in a bis-phosphino amine, and we investigate the potential effects of such distributions on the measurement of average J-coupling constants. Second, we show that the measurement of two-dimensional (2D) distributions of J-couplings provides a much richer probe of local structural disorder than one-dimensional distributions, and we introduce new methods that provide different (selective or non-selective) ways of measuring 2D J distributions in a wide range of disordered systems. These methods are finally applied to a slightly disordered polymorphic sample of fully 13C-enriched cellulose, and then to the bis-phosphino amine sample, from which 2D 2JPP-coupling distributions are clearly identified and interpreted.

Graphical abstract: NMR measurements of scalar-coupling distributions in disordered solids

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Publication details

The article was received on 02 Aug 2006, accepted on 03 Oct 2006 and first published on 24 Oct 2006

Article type: Paper
DOI: 10.1039/B611096G
Citation: Phys. Chem. Chem. Phys., 2007,9, 92-103

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    NMR measurements of scalar-coupling distributions in disordered solids

    S. Cadars, A. Lesage, M. Trierweiler, L. Heux and L. Emsley, Phys. Chem. Chem. Phys., 2007, 9, 92
    DOI: 10.1039/B611096G

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