Abstract
Electrochemical reduction of polypyridine-type complexes of Cr(III), Ru(II), and Os(II) in the presence of S 2O 8 2− ions is accompanied by light emission. The electrochemiluminescence (ecl) spectrum is identical to the photoluminescence spectrum of the complex which undergoes reduction. The net reaction in the electrochemical cell is the reduction of S 2O 8 2− to SO 2− 4 with the polypyridine complex acting as both an electron transfer mediator and as a light emission sensitizer. The experiments were carried out in aqueous solutions for the Cr(III) complexes and in dimethylformamide or acetonitrile for the Ru(II) and Os(II) complexes. The dependence of the ecl emission on S 2O 2− 8 concentration was examined. In preliminary experiments no light emission was obtained with Rh(III) and Ir(III) polypyridine complexes. The interconversion between chemical (and/or electrical) energy and light mediated by suitable sensitizers is briefly discussed.
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