trans-Bis[bis-(di-phenyl-phosphan-yl)methane-κ2P, P']di-chlorido-ruthenium(II): a triclinic polymorph

Abstract

The title compound, [RuCl₂(C₂₅H₂₂P₂)₂] or [RuCl₂(dppm)₂] (dppm = bis-(di-phenyl-phosphan-yl)methane, C₂₅H₂₂P₂) crystallizes as two half-mol-ecules (completed by inversion symmetry) in space group P (Z = 2), with the Ru^II atoms occupying inversion centers at 0,0,0 and 1/2, 1/2, 1/2, respectively. The bidentate phosphane ligands occupy equatorial positions while the chlorido ligands complete the distorted octa-hedral coordination spheres at axial positions. The bite angles of the phosphane chelates are similar for the two mol-ecules [(P-Ru-P)_avg. = 71.1°], while there are significant differences in the twisting of the methyl-ene backbone, with a distance of the methyl-ene C atom from the RuP₄ plane of 0.659 (2) and 0.299 (3) Å, respectively, and also for the phenyl substituents for both mol-ecules due to variations in weak C-H⋯Cl inter-actions.

Keywords: bidentate ligand; crystal structure; dimorphism; ruthenium.