The complexes [Bu2 (DMPA) SnOSn (DMPA) Bu2] 2 (2) and [Bu2Sn (DMPA) 2](3), where HDMPA is 2-[bis (2, 6-dimethylphenyl) amino] benzoic acid, have been prepared and structurally characterized by means of, vibrational, ultra-violet, 1H and 13C NMR spectroscopies. The crystal structure of complexes 2 and 3 have been determined by X-ray crystallography. Three distannoxane rings are present to the dimeric ...