Ruthenium and osmium acyl fluoride complexes. Crystal structure of [OC-6-13][RuF2(CO)2(PPh3)2]·CD2Cl2

Abstract

Fluoroacyl complexes of ruthenium and osmium have been identified in the oxidative addition of XeF₂ to [M(CO)₃(PPh₃)₂](M = Ru or Os) in dichloromethane. The mechanism of reaction, probed by the addition of BF₃, involves oxidation of the metal centre by XeF⁺ followed by nucleophilic attack by F^– at co-ordinated CO. For M = Ru, the fluoroacyl complex is unstable at room temperature and decomposes via elimination of CO to [OC-6-13][RuF₂(CO)₂(PPh₃)₂] for which the ligand arrangement has been confirmed by X-ray crystallography. For M = Os, the analogous complex is obtained by heating the fluoroacyl species in solution for several hours. All the products have been characterised by IR, ¹⁹F and ³¹P NMR spectroscopies.