Binuclear diphenyltin(IV) complexes with salicylaldimine ligands. Synthesis, structure, electrochemical properties

New binuclear tin(IV) complexes based on salicylic Schiff bases and diphenyltin oxide Ph2SnO were obtained. The structures of the complexes were confirmed by 1H, 13C and 119Sn NMR spectroscopy and X-ray diffraction analysis (CCDC 2433411). UV-Vis spectroscopy of complexes 1–4 showed that a bathochromic shift of all ligand absorption bands was observed upon complexation with the metal fragment. The ability of complexes 1–4 to undergo electrochemical transformations was investigated by cyclic voltammetry. In all cases, the oxidation and reduction of the complexes are irreversible. In the cases of complexes 2–4 with a conjugated bridge, the oxidation of two metal fragments occurs at one potential, whereas complex 1 with an unconjugated adipic bridge has two peaks on the oxidation curve at different potentials, which is probably since the oxidation of two different ‘ends’ of the molecule occurs at different potentials.