DI-, TRI- AND POLY-NUCLEAR TRANSITION METAL COMPLEXES OF 3,4-DIACETYL-2,5-HEXANEDIONE

Abstract

Abstract 3,4-Diacetyl-2,5-hexanedione (tetraacetylethane) is a tetradentate dibasic ligand and constitutes two acetylacetone molecules linked together through the central carbon. The ligand is thus capable of coordinating two metal cations. Its reaction with Cu(II), Ni(II), Co(II), Fe(III) and Cr(III) yielded the corresponding complexes, [(M(L-2H)] for Cu(II) and Ni(II), basic Co(III) complex [Co(L-2H)(OH)] and [M(2L-3H) for Fe(III) and Cr(III). These complexes were characterized by their IR, visible and mass spectra and by magnetic measurements. All complexes have octahedral configurations. The mass spectra of the complexes indicated peaks with m/e values higher than the parent peaks, where Ni(II), and Co(III) complexes are dimers and the Cu(II) complex is trimeric. This coupled with the insolubility of the complexes in all common solvents indicates the polymeric nature of the products.