title: (31)P magic angle spinning NMR spectroscopy for probing local environments in paramagnetic europium-substituted wells-dawson polyoxotungstates.
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.
authors: Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, USA.
authors: Wenlin
authors: W
authors: Huang
authors: Lynn C
authors: LC
authors: Francesconi
authors: Tatyana
authors: T
authors: Polenova
mesh_terms: D016880:Anisotropy; D004578:Electron Spin Resonance Spectroscopy; D005063:Europium / Q000737:chemistry*; D008958:Models, Molecular; D009942:Organometallic Compounds / Q000737:chemistry; D010759:Phosphorus Isotopes; D011108:Polymers / Q000737:chemistry*; D017973:Tungsten Compounds / Q000737:chemistry*; D014639:Vanadium / Q000737:chemistry
chemical_list: D009942:Organometallic Compounds; D010759:Phosphorus Isotopes; D011108:Polymers; D017973:Tungsten Compounds; D014639:Vanadium; D005063:Europium; C045951:tungstate