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Department of Chemistry, University of Rajasthan, Jaipur-302 004, India Manuscript received 7 September 2004 The oxidation reaction of hexacyanoferrate(II) by peroxodisulphate (S2O2-8) is accelerated by irradiation with visible light in aqueous acid solutions containing tris(2,2'-bipyridine)ruthenium(II) ion (Ru(bipy)2+3), the latter acts as a photocatalyst. The mechanism of the reaction consists of a chain reaction initiated by the quenching reaction of the photo excited ruthenium(II) complexdoi:10.5281/zenodo.5833421 fatcat:ex7efuk7mzeyxim7cjiwpaae3i