Kinetic Studies of the Reduction of Chloromanganese Porphyrin

Abstract

The reduction of manganese(II1) porphyrins by hydrazine (L) was investigated by stopped-flow techniques. The mechanism of the reaction has been proposed based on the experimental results; the relationship between pseudo-first-order rate constants with the concentration of L. Calculated activation parameters showed that the pre-equilibrium step was exothermic and the reduction step endothermic. Substituent effects in the phenyl rings on the two steps have been examined.