Structure of the cobalt complexes with the Schiff base of salicylaldehyde and lysine according to the H NMR spectroscopic data

The Co(II) complex with the Schiff base of salicylaldehyde and lysine is studied by the ¹H NMR method in dioxane and dimethyl sulfoxide (DMSO) solutions. In a dioxane solution, the complex is paramagnetic and dimeric. In the dimer, the cobalt ion coordinates two ligand molecules and each ligand is bound to two cobalt ions. In a water-containing DMSO solution, the complex is diamagnetic due to the oxidation of Co²⁺ to Co³⁺.