SPECTROPHOTOMETRIC STUDY OF HEXANITROCOBALTATE(III) ION SPONTANEOUS REDUCTION IN WATER-ETHANOL AND WATER-ACETONE MIXTURES

The kinetics of the spontaneous reduction of hexanitrocobaltate(III) i on have been investigated spectrophotometrically (lambda=360 nm at 298 K) in ethanol or acetone water mixtures containing 0, 10, 25 and 50 % of organic solvents. The mechanism of this process was expressed by m eans of two consecutive first-order reactions. Both of the first-order rate constants decrease with the increasing nonaqueous species conten t. The reduction of hexanitrocobaltate(III) ion in the mixtures was mu ch slower than the corresponding reaction in water.