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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