Bis-µ-[bis(diphenylphosphino)methane]-bis(halogenoplatinum)(Pt–Pt); dimeric complexes of platinum(I) containing a platinum–platinum bond

Abstract

Bis-µ-[bis(diphenylphosphino)methane]-bis(chloroplatinum)(Pt–Pt), [{PtCl(dppm)}₂](dppm = Ph₂PCH₂PPh₂), is obtained by treatment of the platinum(II) complex [PtCl₂(dppm)] with Na[BH₄]–MeOH followed by HCl–C₆H₆. The corresponding dimeric bromo- and iodo-complexes of Pt^I are obtained from the chloro-complex by halide exchange. The ¹H and ³¹P n.m.r. and vibrational spectra of these complexes are analysed and strongly support the assigned structure rather than the halogenide-bridged structure proposed earlier. Bands assigned to ν(Pt–Pt) are present in the Raman spectra.