Synthesis, characterization and biological studies of organotin(IV) complexes with hydrazone ligand

Four organotin(IV) complexes with general formula [RSnCln−1(TCB)] [R = Ph2, n = 2 (2); R = Me, n = 3 (3); R = Bu, n = 3 (4); R = Ph, n = 3 (5)] have been synthesized by direct reaction of thiophene-2-carboxaldehyde benzhydrazone ligand [HTCB, (1)], base and organotin(IV) chloride in absolute methanol under N2 atmosphere. All organotin(IV) complexes were characterized by elemental analyses, molar conductivity, UV–Vis, FT-IR, 1H and 13C NMR spectral studies. Among them, diphenyltin(IV) complex (2) has also been characterized by X-ray crystallography diffraction analyses. The cytotoxicity of the hydrazone ligand as well as its organotin(IV) complexes (2–5) were determined with Artemia salina. While no-choice bioassay was employed on Coptotermes sp. to evaluate the termiticidal effect of all the complexes. Besides, the ligand (1) and its organotin(IV) complexes (2–4) were also tested against five types of bacteria namely Bacillus subtilis, Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa and Salmonella typhi.

Graphical abstractThis project is dealing with the synthesis of new ligand under the family of hydrazone follow by the synthesis of a series of organotin(IV) complexes. All of the compounds were characterized with various spectroscopy techniques and the biological activities of the compounds have also been evaluated.Figure optionsDownload full-size imageDownload as PowerPoint slide