CRYSTALLOGRAPHIC EVIDENCE OF HEXACOORDINATION AT PHOSPHORUS VIA INTRAMOLECULAR COORDINATION OF DONOR GROUPS ON PHOSPHANE AND PHOSPHANE SULPHIDE

摘要

The X-ray structure analysis of bis(8-dimethylamino-1-naphthyl)phenylphosphane (3) and of the corresponding sulphide 4 has revealed hexacoordination at phosphorus in both cases, the N ... P separations being less than the sum of the van der Waal radii. Furthermore, in both cases the overall geometry corresponds to a distorted bicapped tetrahedron. The optimum geometry calculated for 4 via the HYPERCHEM program developed by Autodesk (MM + method) suggests that the structure of the molecule is a function not only of steric requirements but also of electronic effects. [References: 30]