SOME NEW SELENIATO DERIVATIVES AND ADDUCTS ORGANOSTANIC CONTAINING SNR2 RESIDUES (R=ME, BU, TBU) AND HALOSTANNIC: SYNTHESIS, INFRARED AND 119SN NMR STUDIES

Seven new selenato and hydrogenoselenatoadducts and derivativesorganostannic containing SnR₂ (R=Me, Bu) residues, SnR₂Cl₂ (R=Bu, ^tBu)andhalostannic containing SnCl₂ molecule have been synthesizedin methanol or ethanol solution in room temperature or at reflux. The complexes have been studied by infrared and ¹¹⁹Sn NMR spectroscopies.The suggested structuresfor the organotin (IV) compounds are discrete or dimer in which the seleniateligandsaremonodentate (for one of them) and monochelating or bichelating for the others SnR₂Cl residues aretetrahedral and SnR₂ residues are linear.Then, in the case of halostannic adducts, the suggested structuresare based in the process of an oxydation of tin (II) atom to tin (IV) atom. The initial SnCl₂molecule become SnCl₄. A dimerization of the molecule formular and rearrangementhave been considered, giving an ionic structure with one cation component and one molecule component stabilized by the ammonium cation. When the ammonium cations in hydrogen bonds are involved, supramolecular architectures may be obtained.