³¹P solid state nuclear magnetic resonance principal values of the chemical shift tensors of phosphane oxides, phosphane sulphides and phosphane selenides

Abstract

The principal components of the ³¹P chemical shift tensor of sixteen phosphane oxides (O=PR ₃), phosphane sulphides (S=PR ₃) and phosphane selenides (Se=PR ₃) have been determined for powder samples using the proton enhanced nuclear induction technique. The chemical shift anisotropy is comparable or larger than the ³¹P chemical shift difference observed in the liquid state by change of coordination or functionality around the phosphorus. For a given group R, the chemical shift anisotropy is larger for the oxide than for the sulphide or selenide. The electronic distribution around the phosphorus parallels the ³¹P chemical shift anisotropy. A linear variation of the asymmetry parameter with the departure from C ₃ symmetry around the phosphorus is observed.

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Notes on contributors

L. Wiesenfeld

Faculty member of the Université Scientifique et Médicale de Grenoble.