Abstract
AbstractThe azidyl radical which is otherwise unreactive towards the Ru(bpy)32+ complex reacts with this complex in aqueous solution provided negatively charged colloidal silica particles are present. The increase in reactivity is explained in terms of ion binding, i.e. Ru(bpy)32+ complexes becoming rather firmly attached to the negatively charged particles. The attachment causes a decrease in the redox potential of the system Ru(bpy)33+/Ru(bpy)32+ from E0 = 1.27 V vs. NHE (in the absence of colloidal silica) to E0 = 1.17 V vs. NHE (in the presence of colloidal silica). This value was obtained on the basis of E0 = 1.35 V vs. NHE for the system N3/N3−.
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