have been synthesized by the reactions of Me 2 SiCl 2 and Me 2 SnCl 2 with Schiff bases in 1:1 and 1:2 molar ratios. L 1 [2-(chlorobenzylidineamino)-5mercapto-3-methyl-s-triazole] and L 2 [4-(flourobenzylidineamino)-5-mercapto-3-methyl-s-triazole] have been synthesized by the condensation of 2-chlorobenzaldehyde and 4-flourobenzaldehyde with 4-amino-5-mercapto-3methyl-s-triazole. Newly synthesized organosilicon and organotin complexes have been characterized by elemental analysis, molar conductance measurements, spectral studies, including UV, IR, 1 H, 13 C, 29 Si, and 119 Sn NMR. The nature of these complexes is non-electrolytic. With the help of these techniques, trigonal bipyramidal and octahedral geometries are proposed for the newly synthesized complexes. The biological activity of these complexes against various bacteria and fungi has been investigated and then compared with free ligands.

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Some new organotin(IV) complexes having general formulae R 2 MCl[L] and R 2 M[L] 2 were synthesized by the reactions of Me 2 MCl 2 with Schiff bases [5-Mercapto-4-(pyrrolcarboxalideneamino)-s-triazole, 5-Mercapto-3-methyl-4-(2-pyrrolcarboxalideneamino)-s-triazole, 3-Ethyl-5-mercapto-4-(2-pyrrolcarboxalideneamino)-s-triazole] in 1:1 and 1:2 molar ratios. All of the compounds were characterized by elemental analysis, molar conductance, IR, UV, 1 H, 13 C and 119 Sn NMR spectral studies. The IR and 1 H NMR spectral data suggest the involvement of azomethine nitrogen in coordination with the central metal atom. With the help of the above-mentioned spectral studies, penta and hexacoordinated environments around the central metal atoms in the 1:1 and 1:2 complexes, respectively, have been proposed. Finally, the free ligands and their metal complexes were tested in vitro against some pathogenic bacteria and fungi to assess their antimicrobial properties.