Bis[μ-N,N'-bis(salicylidene)-1,3-propanediaminato]bis(dimethylformamide)di(μ-nitrito)copper(II)dinickel(II)–Dimethylformamide (1/2)

Abstract

The unit cell of the title compound, [CuNi2(NO2)2(C17H16N2O2)2(C3H7NO)2].2C3H7NO, contains two molecules of the linear heterotrinuclear complex and four solvent molecules. The central CuII ion and the terminal NiII ions have distorted octahedral coordination spheres. The Cu–Ni pairs are each triply bridged, by the O atoms of an N,N'-bis(salicylidene)-1,3-propanediaminato (salpd2−) ligand and by an O and an N atom of a nitrite group. The central CuII ion, located on an inversion centre, has a total of six O atoms in its coordination sphere: two from each salpd2− ligand and one from each bridging nitrite group. The NiII ions are related by the inversion centre and each is coordinated by the two O and two N atoms of a salpd2− ligand and one N atom from a nitrite and an O atom from a dimethylformamide (dmf) ligand. The dmf and nitrite groups are mutually trans about the NiII ion. The Cu—Ni distance is 2.9967 (4) Å.