Phenomenological features of chemiluminescence in manganese(III) reduction reactions

Abstract

Chemiluminescence is generated in the reduction reactions of Mn(III) in sulfuric acid solutions; however, it is absent during the reduction of Mn(III) with iron(II) sulfate or potassium bromide. The dependences of the light yield and the kinetic parameters of chemiluminescence upon the concentration of reagents have been determined for the reactions of Mn(III) reduction with malonic acid. The rate of Mn(III) consumption during the light pathway of the reaction (i.e., reaction that results in chemiexcitation) depends on the squared Mn(III) concentration. The light pathway loses in competition with the dark pathway. The chemiexcitation of Mn2+ follows either one- or two-electron mechanism, but the complex character of the reaction does not allow making selection between these two routes.