Three organotin(IV) Schiff-base carboxylates: Synthesis, structural characterization and in vitro cytotoxicity against cis-platin-resistent cancer cells

•Three organotin(IV) Schiff base carboxylates suppressing the growth of four cis-platin-resistent human lung and colon cancer cells were synthesized.•Di-n‑butyl and triphenyltin(IV) Schiff base carboxylates present higher in vitro cytotoxicities against four cisplatin-resistent cancer cell lines than the dimethyl derivative.•Di-n-butyltin(IV) Schiff base carboxylate presents a promising drug lead for anticancer treatment through producing ROS to induce the death of cancer cells.