电化学发光
过渡金属
化学
有机化学
催化作用
物理化学
电极
作者
Egan H. Doeven,Timothy U. Connell,Narayan Sinha,Oliver S. Wenger,Paul S. Francis
标识
DOI:10.1002/anie.202319047
摘要
Abstract We report the electrochemiluminescence (ECL) of a 3d 6 Cr(0) complex ([Cr(L Mes ) 3 ]; λ em =735 nm) with comparable photophysical properties to those of ECL‐active complexes of 4d 6 or 5d 6 precious metal ions. The electrochemical potentials of [Cr(L Mes ) 3 ] are more negative than those of [Ir(ppy) 3 ] and render the [Cr(L Mes ) 3 ]* excited state inaccessible through conventional co‐reactant ECL with tri‐ n ‐propylamine or oxalate. ECL can be obtained, however, through the annihilation route in which potentials sufficient to oxidise and reduce the luminophore are alternately applied. When combined with [Ir(ppy) 3 ] ( λ em =520 nm), the annihilation ECL of [Cr(L Mes ) 3 ] was greatly enhanced whereas that of [Ir(ppy) 3 ] was diminished. Under appropriate conditions, the relative intensities of the two spectrally distinct emissions can be controlled through the applied potentials. From this starting point for ECL with 3d 6 metal complexes, we discuss some directions for future development.
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