Absorption Spectra and Chemical Behavior of the Hexahydroxylamine Cobalt (III) Complex

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Abstract
The absorption spectrum of hexahydroxylamine cobalt(III) complex was measured and compared with the hitherto obtained data of the other hexammine cobalt (III) complexes. The frequencies of the first and second absorption bands of this complex were 68.5×1013 and ca. 94×1013 sec.−1 respectively. These values are much greater than those found in other hexammine cobalt (III) complexes, and this fact may indicate the strong interaction between the central cobalt (III) ion and nitrogen atoms of the co-ordinating hydroxylamine. In addition to the study of absorption spectra, the rate of decomposition of this complex was measured. The rate of decomposition was proportional to the concentration of the hydroxyl ion, and the activation energy was 32.5 kcal. mole−1. In order to explain the above results, the following equilibrium, assuming the proton dissociation, was proposed;

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