Free energy dependence on tris(2,2 '-bipyridine) ruthenium(II) electrochemiluminescence efficiency

The electrogenerated chemiluminescence (ECL) of Ru(bypy)(3)(2+) with four s eries of electroactive organic compounds in 0.1 M (C2H5)(4)NPF6 acetonitril e solutions has been studied using a triple-potential-step technique. The y ields of the formation of the excited *Ru(bypy)(3)(2+) ion produced by the electron-transfer reaction of Ru(bypy)(3)(+) with aromatic amine or 2,3,7,8 -tetramehoxythianthrene radical cations and by the reaction of Ru(bypy)(3)( 3+) with quinone or nitroaromatic radical anions and N-methylpyridinium rad icals have been determined. The obtained yields for the excited *Ru(bypy)(3 )(2+) ion formation have been compared with the predicted ones according to the oxidative or reductive * Ru(bypy)(3)(2+) quenching data. (C) 2000 Else vier Science B.V. All rights reserved.