SYNTHESIS, SPECTROSCOPY AND THERMAL-ANALYSIS OF NICKEL(II), PALLADIUM(II) AND COPPER(II) COMPLEXES WITH N,N'-BIS(2-HYDROXYETHYL)-OXAMIDE

The new complexes K-2[Ni(H(2)heo)(2)].3H(2)O, K-2[Pd- (H(2)heo)(2)], K -2[Cu(heo)].3H(2)O and [Cu-2(heo).2H(2)O] {heo = [(CONCH2CH2O)(2)](4-) } were prepared and characterized by chemical analyses, conductivity m easurements, thermogravimetry, magnetic susceptibility and i.r. and u. v. spectroscopy. Monomeric square planar structures with MN(4) coordin ation spheres are found for the nickel and palladium complex anions. F or copper, two different complexes were identified. In slightly alkali ne media, a green insoluble nonelectrolyte [Cu-2(heo).2H(2)O] was prep ared; the two copper(II) centres are bridged by the tetra-deprotonated ligand in a trans-planar configuration with the H2O molecules strongl y coordinated to the copper(II). The copper(II) monomer has been prepa red in strong alkaline media, this anion also contains the tetra-depro tonated ligand in a planar trans form.