Notes. N-thionitrosamine complexes: substitution reactions of complexes [MCl(C6H4Me-p)(CO)(PPh3)2(SNNMe2)](M = Ru or Os) and the crystal structure of [OsCl(C6H4Me-p)(CO)(PPh3)2(SNNMe2)]

Abstract

The substitution reactions of [MCl(C₆H₄Me-p)(CO)(PPh₃)₂(SNNMe₂)](M = Ru or Os) with a variety of ligands (azide, carbon monoxide, 2-xylyl isocyanide, or t-butyl cyanide) are described and rationalized with reference to an X-ray structure analysis of [OsCl(C₆H₄Me-p)(CO)(PPh₃)₂(SNNMe₂)] which reveals a comparatively short Os–S bond [2.411(2)Å] and a long Os–Cl bond [2.476(3)Å]. The thionitrosodimethylamine ligand is essentially planar, co-ordinated to osmium with its molecular plane almost perpendicular to the phosphorus–phosphorus vector.