Transition metal complexes generated electrochemically, excited

Thermal electron transfer reactions of transition metal complexes can result in the product complex being formed in its excited state rather than its ground state. If this product is emissive, light is emitted from this excited state and the reaction is defined as chemiluminescent. Chemiluminescence occurs both in the oxidation of Ru(bpyH and in the reduction of Ru(bpy). The oxidation and reduction steps can be carried out by either a chemical or an electrochemical experiment. If the emissive ions are generated electrochemically on an electrode surface, the reaction is termed electrogenerated chemiluminescence. 

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