Mononuclear and Heterobimetallic Complexes of Palladium(II) with 4,5-Diphenyl-1,2,4-triazole-3-thione

Abstract

The reaction of Na₂PdCl₄ with 4,5-diphenyl-1,2,4-triazole-3-thione (LH) in acetone gave cis-[PdCl₂(LH)₂]. Stirring cis-[PdCl₂(LH)₂] in methanol gave a diamagnetic cis-[PdL₂]. Reaction of cis-[PdL₂] with diphosphines gave diamagnetic complexes of the type [PdL₂(diphos)] where diphos = 1,2-bis(diphenylphosphino)methane (dppm), 1,2-bis(diphenylphosphino) ethane (dppe) or 1,2-bis(diphenylphosphino)-propane (dppp). The complexes cis-[PdCl₂(LH)₂] and cis-[PdL₂(diphos)] have been used effectively to prepare bimetallic complexes of the type cis-[Cl₂Pd(μ-LH)₂M´Cl₂] where M´ = Co, Ni, Mn or SnCl₂ and [(diphos)Pd(μ-L)₂M´Cl₂] where M´ = Co or Ni, the prepared complexes were characterized by elemental analysis, magnetic susceptibility, IR, UV-Vis, ¹H and ³¹P-{¹H} NMR spectral data.