A NEW tetra dentate Schiff base ligand has been synthesized from condensation of compound (1): [(4-((1-H-imidazol-2-yldiazenyl)-1,5-dimethyl-2-phenyl-1Hpyrazol-3(2H)-one)]with compound (2) thio semicarbazaide. The general formula of complexes are [M(L)]Cl 2 Where. M= Co(II) ,Ni (II)and Cu(II)Zn(II) are reported. The geometry structures of ligand and the complexes were determined through Fourier-transform infrared spectroscopy (FT-IR), Mass spectra, X-ray diffraction analysis, Ultra violet-Visible(UV-Vis), Proton nuclear magnetic resonance(1 H NMR) spectral studies, magnetic moment measurement, elemental analysis, and molar conductance. These studies revealed square planar geometries for Ni(II) and Co(II) and Cu(II)complexes, except the Zn(II) complex was a tetrahedral geometry around the central metal ion. Complex formation studies via molar ratio and continuous variation methods were consisted to those found in the solid complexes with a ratio of (M:L) as (1:1). Stability constant of complexes were calculated by spectrophotometric methods. Hyper Chem-8 program has been used to predict geometries structures of compounds in gas phase. The heat of formation (∆H f) and binding energy (∆E b) at 298 K for the metal complexes were calculated by PM 3 method. Biological activity studies of the ligand and their metal complexes against several organisms, bacteria Gram positive G(+ve)staphylococcus aureus and bacteria Gram negative G (-ve)Escherichia coli, klebsiella pneumonic, In addition to fungi like Aspergillus Niger, Rhizoclonia bataicola and Aspergillus flavus , are reported. Compounds exhibited the high activity on the growth of all types microorganisms in this study. This may be attributed to the impact of both the chelate effect of Schiff bases ligand and the role of the metal in these complexes.

The importance of Schiff's bases is that they are used as anti-bacterial, tuberculosis, cancer and tumors, as well as their ability to capture metal ions. Schiff's bases play an important role in analytical and industrial chemistry as they are used to resist the corrosion of metals. Photolysis is not considered a degradation pathway for azo dyes. In order to extend the life of products dyed with azo dyes, it is necessary to ensure stability against microbial attack, and tests have shown that azo dyes degrade significantly in short-term tests under aerobic conditions. However, under anaerobic conditions, color change can be observed as a result of biodegradation .A general method for the synthesis of new Azo compound has been employed. Diazotization reaction between 2-amino pyrimidine and 2-amino-4-nitro phenol was used to produce Azo compound F1 [2-amino-4-nitro-6-(pyrimidin-2-yldiazenyl)phenol] then prepare two Azo-Shiff base derivatives by Aldol-condensation reaction of (F1) with p-N,N-dimethyl amino Benzaldehyde and Isatin to give (F2,F3).The research included biological screening as anti-bacterial for (F,F2,F3) and as anti-cancer for (F3) by using cell line type Hep G2. FT-IR,1H-NMR, 13C-NMR and two-dimensional(2D)HSQC spectroscopy was used to characterize these compounds.