The X-ray structures of H 5Re(PMe 2Ph) 3 and H 7Re(PMe 2Ph) 2

Abstract

The structures of H 5Re(PMe 2Ph) 3 and H 7Re(PMe 2Ph) 2 have been solved by single-crystal X-ray diffraction methods. Although the hydride ligands could not be directly located in this study, the overall structure of the complexes could be deduced from a knowledge of the central rhenium/phosphorus core of the molecules. The ReP 3 skeleton of H 5Re(PMe 2Ph) 3 has distorted pyramidal geometry (PReP angles 149.5°, 101.9°, 99.8°) consistent with dodecahedral structure for the H 5ReP 3 core. The ReP 2 backbone of H 7Re(PMe 2Ph) 2 is bent (PReP angle 146.8°), suggesting a tricapped trigonal prismatic geometry for the H 7ReP 2 core in which the P atoms are placed in opposing axial and equatorial positions. Crystallographic details: H 5Re(PMe 2Ph) 3: space group P2 1/c (monoclinic); a = 6.876(3) Å, b = 19.493(7) Å, c = 19.646(8) Å, β = 103.26(2)°, V = 2563.0 Å 3, Z = 4; R = 6.7% for 2067 reflections. H 7Re(PMe 2Ph) 2: space group P2 1/n (monoclinic); a = 19.083(17) Å, b = 6.337(4) Å, c = 15.234(13) Å, β = 93.72(4)°, V = 1834.0 Å 3, Z = 4; R = 5.0% for 1672 reflections.