Heteroligand Cobalt(III) Complexes with Triethanolamine and Aminoacetic Acid

Heteroligand cobalt(III) chelates with triethanolamine and glycine, [Co(HTetm)GlyH₂O] · 2H₂O (I) and [Co(HTetm)GlyNH₃] · 2H₂O (II) (H₃Tetm is N(C₂H₄OH)₃ and HGly is glycine), were synthesized. The acidity constants of complex I were determined at an ionic strength of 0.1. The reactions of I with alcoholic solutions of acids, ammonia, and ammonium nitrate were studied. Binuclear complexes were obtained upon the interaction of I and II with CoCl₂ · 6H₂O. The complexes were characterized using UV–VIS (in aqueous and alcoholic solutions) and IR (in the solid state) spectroscopy. The ¹³C NMR spectra of solutions of Iand II were recorded. The plausible structures of the complexes are discussed.