Synthesis and relation between the structure and magnetism of the dimeric anionic nickel(II) complex [C5H10NH2]+[Ni 2(PhSal)4CH3COO]-

Article abstract of DOI:10.1021/ic00132a030

A new type of binuclear nickel complex [Ni₂(PhSal)₄CH₃COO]^-pipH⁺ has been synthesized and characterized by X-ray crystallography. The nickel atoms have a distorted octahedral environment, containing one bridging and one nonbridging nickel phenylsalicylaldimine (PhSal) ligand and a single bridging acetate group. The two nickel octahedra are related by a twofold axis and share an edge at the bridging phenolic oxygens of the PhSal ligands; they also share an apex via the bridging acetate group and could therefore be regarded as sharing triangular faces. The strength of antiferromagnetic interaction between the nickel atoms contrasts with the magnetic properties of a series of closely related edge-sharing (neutral) nickel(II) complexes in which the bridging acetate is absent. Some of the latter exhibit ferromagnetic interactions and others are more strongly antiferromagnetic than the acetate-bridged ion [Ni₂(PhSal)₄CH₃COO]^-. Crystal data: space group Pbcn; Z = 4; a = 12.092 (6) ?, b = 18.745 (5) ?, c = 22.844 (10) ? R = 5.0% for 1455 reflections; exchange constant J = -4.66 cm^-1.