Abstract
The property of eletrochemiluminescence (ECL) has led to a sensitive and selective detection method for the analysis of a wide range of compounds. 1 Especially, luminescent transition metal complexes have become an increasingly important class of sensor materials, because ECL, in contrast to chemiluminescence (CL), is an electron transfer reaction that results in CL emission without bond breakage or rearrangement and can be recycled. The general rule of luminescent transition metal complexes shows that the emission always arises from the lowest excited state, which is either metal-to-ligand charge transfer (MLCT) or ligand localized π - π * transition. 2,3
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