Studies on the Cobalt (III) Complexes Containing Only One Chelate Ring. I. Syntheses of [Co(NH3)4gly]X2 and [Co(NH3)4alan]X2

The three new complexes, [CoIII(NH3)4 gly]SO4·H2O, [CoIII(NH3)4 alan] SO4 and [CoIII(NH3)2 gly2]Cl, have been synthesized by the reaction of [Co(NH3)4(OH2)Cl]SO4 with the amino-acid radicals in the presence of ammonia and decolorizing charcoal. The visible and the ultraviolet absorption spectra of the glycinato-ammine and alaninato-ammine series of cobalt (III) complexes have been measured and discussed in relation to the geometrical structures of the complex ions.