Syntheses of Polynuclear Complexes from Imidazoles-Nickel(II) Acetate Complexes

Abstract

The composition and configuration of imidazoles-nickel (II) acetate complexes and insoluble matters obtained from these complexes were determined by the elemental analyses, the spectral and magnetic analyses, and the thermal properties were also investigated. The complexes of [NiA₂(HL)₂] (HL:HIm, 2-CH₃ HIm, 2-C₂H₅ Hlm, 2-(CH₃)₂ CH⋅HIm, 4-CH₃⋅HIm, A: CH₃COO^-) type, and [NiA₂(HL)₄]and [Ni(HL)₆]A₂ (HL:HIm, 4-CH₃⋅HIm, A:CH₃COO^-) types indicated the octahedral configuration in the solid state and in the alcoholic solution. The yellowish insoluble matters which are represented with the composition of [NiL₂] (L: im-, 2-CH₃⋅im^-, 4-CH₃⋅im^-) were obtained by refluxing the ethanolic or 1-propanolic solution of the others except for the complexes consisting of 2-C₂H₅ HIm and 2(CH₃)₂CH HIm, but did not produce from the methanolic solution. These insoluble matters were the polynuclear complexes to contain a chain structure consisting of the square planar nickel (II) unit. The formation process of such polynuclear complexes was also discussed.