Abstract
Experimental observation shows that bromomalonic acid (BrMA) is one of the sources of photo-induced Br − ion in the photosensitive Belousov-Zhabotinsky reaction. The rate of Br − production by visible light was measured using a Br −-ion-selective electrode in a solution containing BrMA, H 2SO 4 and Ru(bpy) 3SO 4 but no oxybromine species. The order of reaction was 1 for [BrMA] and [H +], and about 1 2 for the light intensity and [Ru(bpy) 3 2+]. Two types of probable photocyclic mechanisms are proposed.
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