Nickel(II) and Cobalt(II) Complexes with Products of Condensation of 1-Aminonaphthalene, 2-Aminonaphthalenesulfonic-5 Acid,and Aromatic Carbinols

Seven new cobalt(II) and nickel(II) complexes with Schiff's bases were synthesized. The Schiff's bases were prepared by the condensation of 1-aminonaphthalene with carbinols, -hydroxy--phenylacetophenone (L¹), salicylaldehyde (L²), and 2-hydroxy-1-naphthaldehyde (L³), and of 2-aminonaphthalenesulfonic-5 acid with 2-hydroxy-1-naphthaldehyde (L⁴). The compounds were studied by X-ray powder diffraction, thermogravimetry, measurements of magnetic susceptibility, and spectroscopy (IR and diffuse reflectance). The coordination sites of the ligand and their dentate members were determined. A coordination number of four was realized in the Ni(II) and Co(II) complexes with L¹–L³, and the complexes with L⁴ were characterized by a coordination number of six (a dimer with an octahedral environment of each central ion).