Processes involved in luminol oxidation accompanied by chemiluminescence
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Spectrophotometric studies have been carried out on the oxidation of luminol by sodium hypochlorite, working with solutions of various concentrations and pH values. Formation of the final product is the result of a series of successive reactions. The limiting step in the process is the two-electron oxidation of luminol (monoanion) by hypochlorous acid with the formation diazoquinone.
The bimolecular rate constant for the limiting step has been evaluated.
It has been shown that an unstable intermediate, blue-violet in color (pH<9 nm), is formed in the reaction at pH<9. It is assumed that this is a complex of diazoquinone with HOCl which is rapidly converted to stable products.
A parallel path for diazoquinone consumption would lead through hydrolysis and/or a series of sequential reactions, one of which would involve O2. Chemiluminescence arises in the course of this, sequence of changes.
KeywordsLuminol Aminophthalate Luminol Oxidation Alcohol Elimination Aminophthalazine
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