Abstract
Electrogenerated chemiluminescence (ECL) studies have been performed for the iridium(III) cyclometalated L 2Ir(acac) complexes in 0.1 M ( n-C 4H 9) 4NPF 6 acetonitrile–dioxane (1:1, v,v) solutions using a triple-potential-step technique. Electron transfer between electrochemically generated L 2Ir(acac) + cations and A − (radical anions of aromatic nitriles) leads to generation of the excited 3*L 2Ir(acac) species. Extremely high ECL efficiencies (up to 0.55) close to the excited 3*L 2Ir(acac) luminescence yields have been found.
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