A kinetic treatment of stopped‐flow time courses for multiple chemiluminescence of the KIO₄‐luminol‐Mn²⁺ system

Abstract

Stopped-flow time courses for chemiluminescence (CL) of the KIO4-luminol-Mn(2+) system showed an instantaneous jump in initial signal followed by two distinct bands. A kinetic model of the form [formula in text] with ten adjustable parameters was proposed to account for CL intensity (I) versus time (t) profiles. The three terms in the model represent the three CL bands. Each band was comprised of a rise part and an exponential decay corresponding to the formation and deactivation of the CL emitter. CL bands could have originated from different CL pathways with the participation of reactive species such as O2(-), (•)OH and (1)O2 generated in the reactions involving IO4(-), O2 and Mn(2+). Subsequent reactions of these reactive species with luminol induced CL emissions. Simulation parameters together with peak positions and intensities of the three CL bands were found to vary in different manners by changing conditions such as reagent concentration, pH and temperature. The temperature-dependence of the rate constants yielded activation energies of 73.2 ± 2.8, 70.1 ± 2.4 and 67.2 ± 1.2 kJ mol(-1) for the three decay processes. Moreover, different substances exhibited a significant influence on the three CL bands and their simulation parameters. The numerous parameters and characteristics of CL emissions could serve as multiple probes for detecting analytes, making this system promising for potential analytical applications.

A chemiluminescence method to detect hydroquinone with water‐soluble sulphonato‐(salen)manganese(III) complex as catalyst

“…With the continuing research into the chemiluminescence system, many chemiluminescence reactions have been discovered, especially for luminol. In recent years, many CL systems for luminol with several reagents, such as hydrogen peroxide , potassium ferricyanide , potassium permanganate , potassium periodate , silver nitrate , carboxymethyl chitosan , the Cu(III) complex , the Ag(III) complex , hypochlorite , albumin and colloidal MnO 2 have been reported. Among these, the hydrogen peroxide–luminol CL system is simple and stable, and therefore widely applied.…”