Zinc(II) and Nickel(II) Benzoate Complexes from the Use of 1-methyl-45-diphenylimidazole

摘要

Two new complexes, [Zn(O2CPh)2(L)2]·2MeOH (>1 ·2MeOH) and [Ni2(O2CPh))4(L)2]·2MeCN (>2 ·2MeCN), have been synthesized and characterized by X-ray analysis in the course of an ongoing investigation of the M^II/X⁻/L [M^II = Co, Ni, Cu, Zn; X⁻ = Cl⁻, Br⁻, I⁻, NCS⁻, NO3 ⁻, N3 ⁻, PhCO2 ⁻; L = 1-methyl-4,5-diphenylimidazole] reaction system, aiming at understanding and assessing the relative strength and the way in which the intermolecular interactions control the supramolecular organization of these compounds. In the mononuclear complex >1 ·2MeOH, the benzoate ion acts as a monodentate ligand resulting in a distorted tetrahedral N2O2 coordination environment. Complex >2 ·2MeCN exhibits a dinuclear paddle-wheel structure; each Ni^II has a square pyramidal NiNO4 chromophore with four benzoate oxygens in the basal plane and the pyridine-type nitrogen atom of one ligand L at the apex. The structure of >1 ·2MeOH is stabilized by intramolecular π-π interactions between aromatic rings of adjacent 4,5-diphenylimidazole moieties; it is a feature also evidenced in similar compounds of the type [MX2L2].