Complexes of Cobalt(II), Nickel(II) and Copper(II) with an Ambivalent Schiff Base Ligand

Abstract

Condensation of 1-phenyl-1,2-proparndione-2-oxime with 1,2-diaminobenzene in an ethanolic medium yields a Schiff base ligand, bis-(1-phenyl-2-hydroxyimino-1-propylidene) 1,2-diaminobenzene, H₂L. A number of complexes of the types [ML] [M = Co(II), Ni(II), Cu(II}], [M(H₂L)X₂] [M = Co(II), Ni(II), X = Cl^–, Br^–, I^–, ClO^–₄,

NO^–₃] and [Cu₂LX₂] [X = Cl^–, Br^–, I^–, ClO^–₄, NO^–₃] have been

synthesized and characterized on the basis of their elemental

analyses, magnetic moment, infrared and electronic spectral data as

well as conductivity measurements where the ligand behaves as a

tetradentate ligand in the first two series and in a hexadentate

manner in the third one.