The Cobalt(III) Complexes of Ethylenediaminediacetic and Ammoniadiacetic Acids

The cobalt (III) complexes containing ammoniadiacetate group (ada) and ethylene diaminediacetate group (edda) have been prepared: 1) K[Co(ada)2]·4H2O Red-violet 2) K[Co(edda)(CO3)]·H2O Red-violet 3) [Co(edda)(OH2)2]ClO4 Violet 4) K[Co(edda)(NO2)2]·H2O Yellow-brown The visible and the ultraviolet absorption spectra as well as the infrared spectra of these complexes have been measured and discussed in relation to the structures of these complex ions.