Abstract
Abstract The reaction of aroylhydrazines with nickel(II), cobalt(II) and copper(II) ions were investigated. Both bis and tris nickel(II) and cobalt(II) chelates were isolated; magnetic and spectral measurements revealed their octahedral structure. With copper(II) nitrate and sulphate, aroylhydrazines gave only bis complexes. However, with copper(II) chloride, both mono and bis chelates were obtained at low temperature while at high temperature, oxidation-reduction reactions occurred with the formation of complexes with mixed oxidation states of copper. In all the metal chelates prepared in this work, the aroylhydrazine molecule acted as a neutral bidentate ligand, coordinating via the carbonyl oxygen and the amino-nitrogen.
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