Twelve new carboxylato adducts and derivatives containing SnR3 (R = Ph, Me) and SnMe2 residues have been synthesized and characterized by elemental analyses, infrared and 119Sn-Mossbauer spectroscopies. The proposed structures are discrete or of infinite chain type, the carboxylate anion behaving as a bridging bidentate, a monodentate, a tetradentate or a monochelating ligand.