31P magic angle spinning NMR spectroscopy of paramagnetic rare-earth-substituted Keggin and Wells-Dawson solids.

ABSTRACT: Paramagnetic rare-earth elements have been examined as NMR structural probes in polyoxoanionic solids, which have a variety of applications as luminescent materials that are usually disordered and therefore intractable by traditional structural methods. Thirteen Keggin and Wells-Dawson polyoxotungstates containing substitutions with lanthanides of different effective magnetic moments have been examined by 31P magic angle spinning NMR spectroscopy. The electron-nuclear dipolar interaction dominating the spinning sideband envelopes is determined by the lanthanide's magnetic moment and was found to be a sensitive probe of the nature of the polyoxoanion, of the positional isomerism, and of the ion stoichiometry. Electron-nuclear dipolar anisotropies computed based on the point-dipole approxima

SUBMITTER: Huang W 

PROVIDER: S-EPMC2575851 | biostudies-literature | 2008 Jan

REPOSITORIES: biostudies-literature