Preparation and crystal structure of a sulphinylnitrilo complex of rhodium(I): trans-[Rh(CO)(NSO)(PPh3)2]

Abstract

The reaction of CsNSO₂ with [RhH(CO)(PPh₃)₃] in acetonitrile yields trans-[Rh(CO)(NSO)(PPh₃)₂](1) and PPh₃O. Complex (1) has been characterised by elemental analyses, i.r. spectra, and a single-crystal X-ray structure investigation. Crystals of (1) are triclinic, space group P, with a= 9.248(2), b= 9.502(2), c= 10.567(2)Å, α= 71.52(2), β= 89.71 (2), γ= 69.80(2)°, and Z= 1. In the square-planar molecular complex the carbonyl group [Rh–C 1.843(6)Å] is in the trans position relative to the NSO ligand [Rh–N 1.989(9), N–S 1.48(1), S–O 1.51(1)Å; N–S–O 122.5(5)°]. The Rh–P bond lengths to the trans-Co-ordinated phosphine ligands are 2.330(1)Å. The arrangement of the molecules in the crystal is disordered, with a superposition of two half-occupied CO and NSO ligand sites in the electron-density map, simulating the crystallographic inversion centre at the Rh site.