Imine-functionalized organotin(IV) carboxylates: Syntheses, structures and antibacterial activities

Six new imine-functionalized organotin(IV) carboxylates viz. {[( n -Bu) 2 Sn(L 1 )] 2 O]} 2 ( 1 ), [( t -Bu) 2 Sn(L 1 ) 2 ] ( 2 ), [Ph 3 Sn(L 1 )] ( 3 ), [( t -Bu) 4 Sn 2 (OH) 2 (L 2 ) 2 ] ( 4 ), [Ph 3 Sn(L 2 )] ( 5 ) and [( t -Bu) 2 Sn(L 3 ) 2 ] ( 6 ) have been synthesized and characterized by FT-IR spectroscopy, elemental analysis, 1 H, 13 C{ 1 H} and 119 Sn{ 1 H} NMR spectroscopy. The solid-state molecular structures of all compounds have been elucidated by single -crystal X-ray diffraction analyses. Compound 1 shows a ladder -type structure consisting of four tin atoms. Compounds 2 - 3 and 5 - 6 are mononuclear and contain only one tin atom in each compound. Interestingly, compound 4 exhibits a hydroxidebridged dinuclear structure. All compounds were evaluated for their antibacterial activities against E. coli XL -1 Blue cells, and compound 1 showed maximum activity amongst all compounds.