1971 Volume 44 Issue 3 Pages 738-741
Various cobaloximes with the general formula [CoX(DH)2B] (X: Cl, CN, OH, or CH3. DH: Dimethylglyoximato monoanion. B: Bases such as water, nicotinamide, pyridine, imidazole, or a low molecular weight copolymer of acrylamide and 4-vinylpyridine, etc.) were examined for catalytic activity in the H2O2 decomposition reaction. Cyanocobaloximes have less activities than other cobaloximes. The effect of changing the axial bases of cobaloximes was found to be small. When methylcobaloxime was used as a catalyst, the lag time was observed in the dark, while with the irradiation of visible light the reaction proceeded without induction period. An extensive study on chloroaquocobaloxime revealed that the rate is proportional both to the concentration of H2O2 and to the concentration of cobaloxime and inversely proportional to [H+]. It was found that the decomposition of H2O2 with cobaloximes proceeds with a gradual and partial degradation of cobaloximes.
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