PREPARATION, STRUCTURAL AND ANTIMICROBIAL STUDIES OF A NEW BIMETALLIC COMPLEXES INVOLVING A NEW SCHIFF AND MANNICH BASES

Abstract

The present work includes the synthesis of mannich and Schiff bases [dichloro(N{3-(5-furfuralidene)-1,3,4-thiadiazole-2-hione} methylpyrazole)] cadimium(II)[A3], by reacting (5-amino-2-thione-1,3,4-thiadiazole) with furfuraldehyde and pyrazol to form new mannich base [3-pyrazole amino methyl-2-thione-5-amino-1,3,4-thiadiazole][A1].Reaction of this derivative with cadimium chloride to give complex with tetrahedral geometry [dichloro(N{3-(5-amino-2-thione-1,3,4-thiadiazole)} methyl pyrazole)]Cadmium(II)[A2] ,this [A2] complex on further reaction with furfuraldhyde to give new Schiff base compound [A3]. The products [A1,A2 and A3] were characterized by FT-IR and elemental analysis (C.H.N).[A3]act as aligand coordinating with various valent metal ions {Mn(II), Pd(II), Fe(III), Au(III) ,V(IV) and Pt(IV)}.The prepared complexes were identified and their structural geometries were suggested by using elemental analysis (C.H.N), Flame atomic absorption technique, FT-IR and UV—Vis Spectroscopy , in addition to magnetic susceptibility and conductivity measurements. The study of the nature of the complexes formed in mixture of chloroform-ethanol solution, following the mole ratio method, gave results which were compared successfully with those obtained from solid state studied. The apparent stability constant of the complexes have been studied with the time and their color were stable for more than (4) hours, as well as the molar absorptivities have been calculated. the antibacterial activity for the ligand (A3) and their metal complexes (R1-R6) were studied against two selected micro-organisms (Shigella flexneri, as gram negative) and (Staphylococcus aurous, as gram positive), also the minimal inhibitory concentration (MIC) have been studied to determined the low concentration for inhibition. Further more the antifungi activity against two micro-organism (Candida albicans and Aspergillus flavus) were studied for the ligand and their metal complexes.