Synthesis and X-ray structural characterization of unsymmetrical tetradentate complexes of Ni(II) and Cu(II)

The unsymmetrical tetradentate Schiff base H2L was prepared by the reaction of salicylaldehyde with the mono Schiff base derived from o-phenylenediamine and o-hydroxyacetophenone (HL1). NiL and CuL complexes were prepared and characterized by H-1 NMR, IR and single crystal X-ray structure determination. Crystal data for NiL: triclinic space group P-1, a= 7.190 (2) Angstrom, b = 13.059 (4) Angstrom, c = 17.867 (10)Angstrom, alpha=74.888 (10)degrees, beta=84.206 (10)degrees, gamma=86.542 (2)degrees and z=4. Crystal data for CuL: monoclinic space group P2(I)/n, a=12.8209 (6)Angstrom, b= 6.988 (3)Angstrom, c=18.601 (9)Angstrom, beta = 105.15degrees and z = 4. The Ni and Cu atoms have a slightly distorted square-planar coordination geometry.