Spectral studies and antimicrobial activities of organosilicon(IV) and organotin(IV) complexes of nitrogen and sulfur donor Schiff bases derived from 4-amino-5-mercapto-3-methyl-s-triazole

Abstract

Some new organosilicon(IV) and organotin(IV) complexes formulated as R₂SiCl[L¹], R₂SiCl[L²], R₂Si[L¹]₂, R₂Si[L²]₂, R₂SnCl[L¹], R₂SnCl[L²], R₂Sn[L¹]₂, and R₂Sn[L²]₂ have been synthesized by the reactions of Me₂SiCl₂ and Me₂SnCl₂ with Schiff bases in 1:1 and 1:2 molar ratios. L¹ [2-(chlorobenzylidineamino)-5-mercapto-3-methyl-s-triazole] and L²[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-3-methyl-s-triazole. Newly synthesized organosilicon and organotin complexes have been characterized by elemental analysis, molar conductance measurements, spectral studies, including UV, IR, ¹H, ¹³C, ²⁹Si, and ¹¹⁹Sn 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.

Keywords:

• organosilicon
• organotin
• s-triazoles
• Schiff bases

Acknowledgements

This investigation received financial assistance from UGC, New Delhi provided Senior Research Fellowship under Rajiv Gandhi National Fellowship Scheme to one of the author (Dharampal). The authors are also thankful to the Head, RSIC of Panjab University, Chandigarh for providing Metal NMR, C, H and N analyses.