A structure activity study of sequestered selenoxide catalysts for the activation of hydrogen peroxide as a means to eliminate biofouling
Bryant, Amber Lynn
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Biofouling is the unwanted accumulation of marine organisms on a wetted surface. This has been and continues to be an issue causing concern, especially when it occurs on ships and hulls. In this study, a series of selenoxide catalysts having different functionality were prepared and sequestered within sol-gel derived xerogels for the activation of hydrogen peroxide. In the presence of halide salts, the reaction allows the halogenation of organic substrates. The hydrogen peroxide also oxidizes the halides present, creating hypohalous acid, which acts a biocide to minimize the adhesion of marine substrates. Bromination of 4-pentenoic acid in the presence of sodium bromide and hydrogen peroxide provides a way to determine the catalytic rate of each selenoxide. A structure-activity study using 1 H NMR techniques shows that the nature of the substituents on the selenoxide controls the rate of halogenation by each catalyst. The selenoxide with the greatest catalytic rate may be the most effective for the prevention of biofilm formation.