Optoelectronic and Redox Properties of New Diethyl-Substituted Tin(iv) Complexes With Schiff Bases Containing a Hydrazone Fragment

New mononuclear tin(IV) complexes were obtained by condensation of diethyltin oxide EtSnO with a series of Schiff bases containing a hydrazone fragment. The structure of the complexes was confirmed by H, C, and Sn NMR spectroscopy and X-ray diffraction analysis (CCDC 2451176 (2), 2451177 (3), and 2451178 (4)). Optoelectronic and redox properties of complexes 1–4 were studied using UV spectroscopy and cyclic voltammetry, and the energy gap value was estimated. Electrochemical oxidation and reduction of complexes 1, 2, and 3 are irreversible and are accompanied by further chemical transformations. In contrast, electroreduction of complex 4 with a pincer ligand results in the formation of persistent anion–radical particles.