Résumé
Three new organotin complexes (two selenito and an oxalate one) adducts have been synthesized and studied by infrared and Mssbauer techniques. A discrete structure is suggested with a bi-unidentate selenito oxyanion and trans bipyramidal SnPh3 residue; the oxalato adduct can be seen as an insertion compound between C2O4(SnPh3)(2) and [Cu(En)(3)]C2O4 center dot 4SnPh(2)C(2)O(4). This last compound has a discrete ionic structure with cis coordinated SnPh2 residues.