A Copper(II) Compound of a Tetradentate Amine Imine Ligand with Coordinated Tetrachlorozincate Ion

Abstract

Reaction of bis(ethane-1,2-diamine)copper(II) chloride with acetone in the presence of zinc(II) chloride yields m-chloro-trichloro-2K³Cl-(4,6,6-trimethyl-3,7-diazanon-3-ene-1,9-diamine-1K⁴N,N¢,N¢¢,N¢¢¢)copper(II)zinc(II). This has copper(II) coordinated by the tetradentate triamine monoimine ligand NH₂–(CH₂)₂–N=C(CH₃)– CH₂–C(CH₃)₂–NH–(CH₂)₂–NH₂. The coordination geometry is pyramidally distorted square planar, with trans N–Cu–N angles of 167.5(2) and 178.8(2)˚, and Cu–N distances for primary amine 2.001(4) and 2.007(4), secondary amine 2.011(4) and imine 1.988(4) Å. One chloride ion of the [ZnCl₄]^2– ion is weakly coordinated axially (Cu···Cl 2.679(1) Å, Cu···Cl–Zn 110.83(6)˚ with supporting N–H···Cl hydrogen bonds between the two primary amine groups and two further chloride ions of the ZnCl₄ ^2– ion [C₁₀H₂₄Cl₄CuN₄Zn, M_r 471.04, orthorhombic, space group P_na2₁, a 11.418(1), b 15.392(2), c 10.723(2) Å, Z 4, R₁ = 0.030 for 2039 reflections with I > 2s(I)].