Complexes of the platinum metals. Part 46. 1,1,1,5,5,5-Hexafluoro-3-azapentane-2,4-diiminato derivatives of ruthenium, osmium and iridium. Crystal structure of [Ru{NHC(CF3)NC(CF3)NH}H(CO)(PPh3)2]

Abstract

Trifluoroacetamidine, NHC(CF₃)–NH₂, underwent a condensation reaction in the presence of certain platinum metal hydrides in boiling toluene to liberate ammonia and form complexes containing the N,N′-chelating 1,1,1,5,5,5-hexafluoro-3-azapentane-2,4-diiminate ligand NHC(CF₃)NC(CF₃)NH. Complexes prepared in this manner were [[graphic omitted]H}H(CO)(PPh₃)₂, [[graphic omitted]H}Cl(CO)(PPh₃)₂, [[graphic omitted]H}₂(PPh₃)₂(M = Ru or Os) and [[graphic omitted]H}H₂(PPh₃)₂. Under similar conditions [Ru(O₂CCF₃)₂(CO)(PPh₃)₂reacted to afford the complex [[graphic omitted]H}(O₂CCF₃)(CO)(PPh₃)₂ in which intramolecular hydrogen bonding between the non-co-ordinated oxygen of the monodentate trifluoroacetate ligand and the adjacent NH moiety has been detected. An X-ray crystallographic study performed on [[graphic omitted]H}H(CO)(PPh₃)₂has confirmed an octahedral ruthenium(II) structure with trans-phosphine ligands and a chelating NHC(CF₃)NC(CF₃)NH^– moiety.