Abstract
The catalytic oxidation of 2-mercaptoethanol was investigated kinetically for the system cobalt(II) phthalocyanine-tetra(sodium sulfonate) in the presence of poly(quaternary ammonium salts). The kinetics follow the two-substrate Michaelis-Menten rate law, in which 2-mercaptoethanol is one substrate and oxygen the other. At low thiol concentrations, the decrease in the rate of oxygen consumption during a catalytic reaction can be described by an exponential decay curve. At higher thiol concentrations, the complete two-substrate Michaelis-Menten rate law must be used. A very high turnover number of 4300 ± 400 s −1 was found. Furthermore, the equilibrium constant for the addition of thiol was found to be 46 ± 10 M −1.
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