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(31)P magic angle spinning NMR spectroscopy for probing local environments in paramagnetic europium-substituted
Wenlin Huang1, Lynn C Francesconi, Tatyana Polenova
1Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, USA.
Abstract:
A series of europium-substituted Wells-Dawson polyoxotungstates were addressed by 31P magic angle spinning (MAS) NMR spectroscopy. The electron-nuclear dipolar interaction dominates the 31P spinning-sideband envelopes. The experimental electron-nuclear dipolar anisotropies were found to be in good agreement with those calculated based on the known crystallographic coordinates and effective magnetic moments and assuming a point-dipole approximation. These electron-nuclear dipolar anisotropies directly report on the anion stoichiometry and on the positional isomerism, indicating that 31P MAS NMR spectroscopy may be a useful and quick analytical probe of the local environment in Wells-Dawson solids containing localized europium paramagnetic centers.
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