The direct detection of a hydrogen bond in the solid state by NMR through the observation of a hydrogen-bond mediated (15)N [bond] (15)N J coupling |
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Authors: | Brown Steven P Pérez-Torralba Marta Sanz Dionísia Claramunt Rosa María Emsley Lyndon |
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Affiliation: | Laboratoire de Stéréochimie et des Interactions Moléculaires, UMR 5532 CNRS/ENS, Laboratoire de Recherche Conventionné du CEA (no. 23V), Ecole Normale Supérieure de Lyon, 69364 Lyon, France. |
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Abstract: | A new method for detecting hydrogen bonds in the solid state is presented. Using two-dimensional NMR correlation experiments, it is shown that a hydrogen-bond mediated J coupling can be observed in a powder under magic-angle spinning conditions, even though the J coupling is 2 orders of magnitude smaller than the dominant anisotropic interactions encountered in solid-state NMR. Specifically, the observation of a pair of peaks in a two-dimensional 15N-15N solid-state INADEQUATE experiment due to two nitrogens that have no covalent connectivity is attributed to the presence of a J coupling across a linking hydrogen bond. |
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