A hydrogen atom in an organoplatinum-amine system: tautomers having either a bridging hydrogen with platinum(II) or a hydride on platinum(IV). The X-ray crystal structure at 100 K of [Pt{C10H6(NMe2)-8-C,N}{C10H6(NHMe2)-8-C}(Br)]

Abstract

The unique zwitterionic complexes [Pt{C₁₀H₆(NMe₂)-8-C,N}{C₁₀H₆(NHMe₂)-8-C}(X)](X = Br, Cl) with a hydrogen atom bridging between the platinum(II) centre and the formerly co-ordinating nitrogen (δ_H NH+ 15.8 ppm [¹J_PtH 180 Hz]; X-ray structure, X = Br), can be obtained from the reaction of cis-[Pt{C₁₀H₆(NMe₂)-8-C,N}₂]with R₂SnX₂(R = Me, Ph; X = Br, Cl) in CH₂Cl₂–MeOH; in non-protic solvents this reaction gives the isolable Pt^IV hydride complex [Pt{C₁₀H₆(NMe₂)-8-C,N}₂(H)(X)](δ_H PtH– 20.35 ppm [¹J_PtH 1540 Hz], X = Br).