benzoate Schiff base (C 16 H 15 NO 3 ), were synthesized and the structure was studied against the bases of X-ray, UV, visible, elemental analysis, 1 HNMR, IR and Mass spectroscopy. The crystal structure of the nickel complex has been determined by single crystal X-ray conformed the molecule, which indicate the compound is crystalline in the monoclinic C2 / c with a = 16.0916 (5) Å, b = 6.0315 (2) Å, c =29.0072 (10) Å, α = 90.00°, β= 101.856 (2)°, γ = 90.00°, V= 2755.3 (2) Å3 and Z = 8. Because of intra-molecular hydrogen bond involving the O atom of hydroxy group and N atom of azomethine group; the two benzene rings and azomethine group are practically coplanar. The Cobalt complex was prepared; the structure was characterized in the bases of IR spectra, elemental analysis, UV -visible, and conductance measurements. Also, the biological activity of both Schiff base and its Cobalt complex show that they are biologically active.
INTRODUCTION:Schiff bases, which have an azomethine (imine) group (-C=N-) are usually prepared by condensation of a primary amine with an active carbonyl compound usually aldehyde or ketone 1 . Schiff bases as chelating agents (ligands) in the field of coordination chemistry and their metal complexes are of great interest for many years; because O, N, and S atoms play a vital role at the active sites of numerous metallobiomolecules in the coordination chemistry of d-block elements 2 in addition of their biological applications as anticancer, antimicrobial 3 , antifungal, antibacterial, and antiviral agents 4 .