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Article Dans Une Revue ChemPhysChem Année : 2014

Deuterium MAS NMR Studies of Dynamics on Multiple Timescales: Histidine and Oxalic Acid.

Résumé

Deuterium ((2) H) magic-angle spinning (MAS) nuclear magnetic resonance is applied to monitor the dynamics of the exchanging labile deuterons of polycrystalline L-histidine hydrochloride monohydrate-d7 and α-oxalic acid dihydrate-d6 . Direct experimental evidence of fast dynamics is obtained from T1Z and T1Q measurements. Further motional information is extracted from two-dimensional single-quantum (SQ) and double-quantum (DQ) MAS spectra. Differences between the SQ and DQ linewidths clearly indicate the presence of motions on intermediate timescales for the carboxylic moiety and the D2 O in α-oxalic acid dihydrate, and for the amine group and the D2 O in L-histidine hydrochloride monohydrate. Comparison of the relaxation rate constants of Zeeman and quadrupolar order with the relaxation rate constants of the DQ coherences suggests the co-existence of fast and slow motional processes.

Domaines

Chimie organique

Dates et versions

hal-01079684 , version 1 (03-11-2014)

Identifiants

Citer

Monique Chan-Huot, Stephen Wimperis, Christel Gervais, Geoffrey Bodenhausen, Luminita Duma. Deuterium MAS NMR Studies of Dynamics on Multiple Timescales: Histidine and Oxalic Acid.. ChemPhysChem, 2014, 16 (1), pp.204-215. ⟨10.1002/cphc.201402506⟩. ⟨hal-01079684⟩
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