Résumé : The synthesis and characterization of tetraethylammonium (diorgano)halogeno(2, 6‐pyridinedicarboxylato)stannates are described. The solution structures of these complexes in CDCl3 and DMSO are discussed on the basis of 119Sn and 19F NMR data. Their in vitro antitumour activities against two human tumour cell lines, MCF‐7 and WiDr, are presented. Copyright © 1993 John Wiley & Sons, Ltd.