NMR heteronuclear correlation between quadrupolar nuclei in solids.
We show for the first time that it is possible to acquire high-resolution heteronuclear NMR correlation experiments in solid state between second-order-broadened half integer quadrupolar nuclei (i.e., 27Al and 17O) using the scalar J-coupling. The sensitivity of the experiment is dramatically improved at high fields (gain proportional to the fourth power of the principal field) with a combination of signal enhancement techniques. This turns a challenging experiment into a real tool. We apply this experiment to characterize a calcium aluminate glass in which we prove the presence of tricluster mu3 oxygen sites and describe the signature of their directly bonded aluminum sites. Applications involve a large range of possible pairs of quadrupolar nuclei in different materials, such as glasses, porous or mesoporous framework materials, zeolites, hybrid organic-inorganic, and bioinvolved materials.
Iuga
Dinu
D
CRMHT-CNRS, 1D Avenue de la Recherche Scientifique, 45071 Orléans Cedex 2, France.
Morais
Claudia
C
Gan
Zhehong
Z
Neuville
Daniel R
DR
Cormier
Laurent
L
Massiot
Dominique
D
D003460:Crystallization; D005898:Glass / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods* / Q000592:standards; D012015:Reference Standards; D012680:Sensitivity and Specificity