Phosphinohydrazines. Part III. Coordination compounds of N,N-dimethyl,N′-diphenylphosphinohydrazine and N,N-dimethyl,N′-diphenylthiophosphinatohydrazine

Abstract

Reactions between N,N-dimethyl,N′-diphenylphosphinohydrazine, Me2NNHP(C6H5)2, (DPH), or N,N-dimethyl,N′-diphenylthiophosphinatohydrazine, Me2NNHP(S) (C6H5)2, (DPS), and appropriate metal salts have yielded the new coordination complexes Pd(DPH)Cl2, Pd(DPH)2Cl2, Pd(DPH)2Cl(ClO4), Pt(DPH)2Cl2, Pt(DPH)Cl4, Hg(DPH)Cl2, Pd(DPS)Cl2, Pt(DPS)Cl4, Ag(DPS)NO3, Zn(DPS)Cl2, Cd(DPS)Cl2, and Hg(DPS)Cl2. Notably, complexes of 1:1 ligand:metal stoichiometry predominate, the only exceptions being Pd(DPH)2Cl2 and Pt(DPH)2Cl2. In reactions between DPH and Zn(II) or Cd(II) salts, ready cleavage of the P—N bond was observed; the metal complexes of dimethylhydrazine were isolated in both instances. With the ligand DPS, however, the P—N bond was consistently stable against cleavage. Many reactions involving Co(II), Ni(II), Ag(I), Au(III), In(III), and Sn(II) resulted in the formation of intractable oils, or in reduction to the metallic state.