Palladium(I) carbonyl halide complexes

Abstract

Salts (R₄N)₂[Pd₂X₄(CO)₂][R = Prⁿ, Buⁿ, or pentyl (Pnⁿ); X = Cl or Br] have been prepared. From their i.r., and in some cases Raman, spectra it is concluded that they have carbonyl-bridged structures. The anions appear to be essentially planar in the solid Prⁿ₄N⁺ salts but in solution and as the salts of the larger cations they seem to be bent about the carbonyl bridge. I.r. spectra indicate that the polymeric complex (PdXCO)_n(X = Cl or Br) has CO and X bridges alternately between palladium atoms. Phases of probable molecular forms (Prⁿ₄N)₂[Pd₄Cl₆(CO)₄] and Pd₆Cl₆(CO)₆(PhCN)₂ have been obtained and their i.r. spectra studied. The work indicates that a previous report of [PdCl₂(H)CO]^– salts and a derived complex [PdCl₂(CO)(AsPh₃)] is in error.