Studies of Ethylenediamine-N,N′-diacetatocobalt(III) Complexes. I. The Preparation and Some Properties of Ethylenediamine-N,N′-diacetatocobalt(III) Complexes, with Chloride, Water, Ammonia, Ethylenediamine, 1,10-Phenanthroline, and 2,2′-Dipyridyl as the Additional Ligands

A series of cobalt(III) complexes containing the tetradentate ethylenediamine-N,N′-diacetate anion (EDDA) and chloride, water, ammonia, ethylenediamine, 1,10-phenanthroline, and 2,2′-dipyridyl as the ligands occupying the residual coordination positions have been prepared, and some of their physical and chemical properties have been examined. Two isomers have been isolated in the cases of the phenanthroline and dipyridyl complexes; they have been inferred to be the α-cis(pink) and the β-cis(red) isomers on the basis of their electronic absorption spectra. A new convenient route for the preparation of the series has been presented, a route which passes through the dichloro, chloroaquo, and diaquo complexes.