SYNTHESIS, STRUCTURAL STUDY AND ANTIBACTERIAL ACTIVITY OF SOME NEW COMPLEXES WITH 2-N(4-N,N-DIMETHYL BENZYLIDEN)-5-(P-IODO PHENYL)-1,3,4-THIODIAZOLE WITH Cr (III), Mn (II), and Cd (II) IONS

A new Schiff base 2-N(4-N,N-dimethyl benzyliden)-5-(p-Iodo phenyl)-1,3,4-thiodiazol and its metal complexes with Cr(III), Mn(II), and Cd (II) ions , were synthesized . The prepared complexes were identified and their structural geometries were suggested by using flame atomic absorption technique, FT-IR and Uv-vis Spectroscopy, in addition to Magnetic Susceptibility and Conductivity measurements .Different bonding and structural behavior were revealed through the study of the coordination chemistry of the metal complexes of the ligand. The nature of bonding between the metal ion and the donor atoms of the ligand were demonstrated through the calculated of Racah parameter and the other ligand field parameters which were calculated by using suitable Tanaba-Sugano-diagrams .Structural geometries of these compounds were also suggested in gas phase by using theoretical treatments, using Hyper chem-6 program for the molecular mechanics and semi-empirical calculations. The heat of formation ( Hf ) and binding energy ( Eb)for the free ligand and it s metal complexes were calculated by PM3 methods. The antibacterial activity for the ligand and its metal complexes were studied against two selected microorganisms ( S t a p h y l o c occus aureus) as gram positive and ( P s e u d o m o nas aeruginosa) as gram negative.