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Complexes of the type R2SnL2, where R = phenyl, butyl and methyl and LH = 2-thioacetic-5-phenyl-1,3,4-oxadiazole, have been synthesized and characterized by physico-chemical (elemental analysis, and electrolytic conductance) and spectral (UV-Visible, IR and (1H, 13C and 119Sn NMR) techniques. Monomer structures for the complexes, bidentate and octahedral geometry was proposed for the complexes prepared. Preliminary in vitro tests for fungicidal activity show that all prepared compounds display good activity to Gibberela, Cercospora arachidicola, Physolospora piricola and Fusarium oxysporum. Moreover, the Ph2SnL2 shows a higher inhibition percentage then diorganotin carboxylate.

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A total of five new metal complexes derivatives of 2-{[5-(4-nitrophenyl)-1,3,4-thiadiazol-2-ylimino]methyl}phenol (HL) with the metal ions [Ni(II), Cu(II), Zn(II), Cd(II) and Sn(II)] have been successfully prepared in alcoholic medium. The complexes obtained are characterized quantitatively and qualitatively by using microelemental analysis, FTIR spectroscopy, UV-visible spectroscopy, mass spectroscopy, 1 H and 13 C NMR, magnetic susceptibility and conductivity measurements. From the spectral study, all the complexes obtained as monomeric structure and the metals centre moieties are four-coordinated with distorted tetrahedral geometry except Cu(II) complex which existed as a distorted square planar geometry. The preliminary in vitro antibacterial screening activity revealed that complexes 1-5 showed moderate activity against tested bacterial strains and slightly higher compared to the parent ligand.