Triple-quantum correlation NMR experiments in solids using J-couplings.
We show that triple-quantum-single-quantum (TQ-SQ) correlation spectra of crystalline and disordered solids can be obtained under MAS using pulse sequences based on through-bond J-couplings. The feasibility of the experiments in coupled spin-1/2 systems is demonstrated for fully 13C-labelled L-alanine and Pb3P4O13 crystalline compounds, considered as model three-spin and four-spin systems, respectively. In the case of phosphate glasses, we show that the obtained TQ-SQ correlation spectra provide an improved description of the glass forming network connectivities and of the chain length distribution in the disordered network.
Fayon
Franck
F
Centre de Recherches sur les Matériaux à Haute Température, CNRS, 45071 Orléans cedex 2, France. fayon@cnrs-orleans.fr
Roiland
Claire
C
Emsley
Lyndon
L
Massiot
Dominique
D
D000409:Alanine / Q000737:chemistry*; D002247:Carbon Isotopes; D005898:Glass / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*
D002247:Carbon Isotopes; D000409:Alanine