Reversible formation of gold crystallites takes place in methanol-swollen cross-linked polymers of diallyldimethylammonium chloride. Metal particles are generated in air-saturated gels via the photoreduction of Au(III) complexes. Oxidation of the crystallites proceeds through a dark reaction that regenerates the Au(III) species. The particle generation process remains completely reversible throughout several formation and decay cycles, indicating that this gel system behaves in a photoresponsive fashion.
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Weaver et al. (1996) studied this question.
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