Preparation and characterization of cobalt(III) complexes with sarcosine and some tetradentate ligands of the edda type

Meridional geometrical isomers of cobalt(III) complexes with sarcosine (N-m ethylglycine) and tetradentate ligands edda (ethylenediamine-N, N ' -diacet ate ion), eddp (ethylenediamine-N, N ' -di-3-propionate ion) and 1,3-pdda ( 1, 3-propylenediamine-N,N ' -diacetate ion) have been prepared. The edda an d eddp cobalt(III) complexes were made by the reaction of sarcosine and sod ium ethylenediamine-N, N ' -diacetato(carbonato)cobaltate(III), and sodium uns-cis-(ethylenediamine-N,, N ' -di-3-propionato)(carbonato)cobaltate(III) dihydrate, respectively. The previously synthesized pdda-cobalt(III) compl ex with sarcosine was obtained by a new route by direct synthesis of cobalt (II) chloride hexahydrate with sarcosine and 1,3-pdda in the presents of le ad(IV) oxide. Complexes were isolated chromatographically and characterized by elemental analysis, electron absorption spectra, infrared spectra and H -1 NMR spectroscopy.