Rare earth complexes with noncyclic polyether-methionine Schiff base

A novel Schiff base (TAMET) was synthesized by the condensation of tetragly col aldehyde with methionine and a mild oxidant CrO3.(C5H5N)(2) was selecte d for the reaction. Seven new rare earth complexes with this Schiff base ha ve been synthesized and characterized by elemental analysis, TG-DTA, molar conductivity, magnetic susceptibility and IR, especially H-1 NMR spectra. I nformation was obtained from reflectance spectra and the coordination of su lfur atom to rare earths was discussed. The experimental results show that these compounds have some biological activity and could dispose of O-2(.-).