SYNTHESIS AND X-RAY STRUCTURAL CHARACTERIZATION OF UNSYMMETRICAL TETRADENTATE COMPLEXES OF Ni(II) AND Cu(II)

ABSTRACT

The unsymmetrical tetradentate Schiff base H₂L was prepared by the reaction of salicylaldehyde with the mono Schiff base derived from o-phenylenediamine and o-hydroxyaceto-phenone (HL¹). NiL and CuL complexes were prepared and characterized by ¹H NMR, IR and single crystal X-ray structure determination. Crystal data for NiL: triclinic space group P-1, a=7.190 (2) Å, b=13.059 (4) Å, c=17.867 (10) Å, α=74.888 (10)°, β=84.206 (10)°, γ=86.542 (2)° and z=4. Crystal data for CuL: monoclinic space group P2_I/n, a=12.8209 (6) Å, b= 6.988 (3) Å, c=18.601 (9) Å, β=105.15° and z=4. The Ni and Cu atoms have a slightly distorted square-planar coordination geometry.

ACKNOWLEDGMENT

M. L. wishes to thank Dr. N. W. Alcock, University of Warwick, for providing the opportunity to work in his laboratory.