Synthesis, structure and relative hydrolytic stability of cis-[PtCl2L] and cis-[W(CO)4L] where L is the bidentate triaminophosphine ligand [MeNCH2CH2N(Me)PN(Me)CH2]2

Abstract

The ligand Me[graphic omitted]N(Me)CH₂CH₂N(Me)[graphic omitted]Me (L) reacted with [{Pt-(C₂H₄)Cl₂}₂] to give a mixture of cis-[PtCl₂L] and trans-[{PtCl₂-(µ-L)}₂] and with [W(CO)₄(nbd)](nbd = norbornadiene) to give cis-[W(CO)₄L] and [{W(CO)₄(µ-L)}_n](n= 2–4). The ligand L and [W(CO)₄L] are readily hydrolysed to give HPO₃^2–, 2MeNHCH₂CH₂NH₂Me⁺ and MeNHCH₂CH₂NHMe. In contrast the complex [PtCl₂L] is considerably more resistant to ligand hydrolysis. The molecular structures of cis-[PtCl₂L], cis-[W(CO)₄L] and [W(CO)₄(MeNHCH₂CH₂NHMe)]{a hydrolysis product of the reaction of [W(CO)₄L] with water} have been determined by single-crystal X-ray diffraction studies. Crystal data (all monoclinic): cis-[PtCl₂L]. space group Cc, a= 17.986(2), b= 9.286(1), c= 12.059(1)Å, β= 91.07(1)°, Z= 4. R= 0.024 (R′= 0.028); cis-[W(CO)L], space group Pn, a= 15.611(3), b= 8.437(2), c= 27.604(6), β= 99.78(3)°, Z= 6, R= 0.036 (R′= 0.039); [W(CO)₄-(MeNHCH₂CH₂NHMe], space group C2/c, a= 22.960(2), b= 7.456(1), c= 14.039(1)Å, β= 106.60(1)°, Z= 8, R= 0.040 (R′= 0.045).