AI Article Synopsis
- This study investigates the electrochemiluminescence (ECL) properties of a chromium complex ([Cr(L)]) that emits light at 735 nm and shows similar behavior to more expensive precious metal complexes.
- The electrochemical properties of [Cr(L)] make it difficult to access its excited state using typical ECL methods, but ECL can be achieved using an annihilation route with alternating potentials.
- When combined with another complex ([Ir(ppy)]) that emits at 520 nm, the ECL of [Cr(L)] is significantly enhanced, allowing for controlled emissions from both complexes depending on the applied potentials.
Article Abstract
We report the electrochemiluminescence (ECL) of a 3d Cr(0) complex ([Cr(L)]; λ=735 nm) with comparable photophysical properties to those of ECL-active complexes of 4d or 5d precious metal ions. The electrochemical potentials of [Cr(L)] are more negative than those of [Ir(ppy)] and render the [Cr(L)]* 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)] (λ=520 nm), the annihilation ECL of [Cr(L)] was greatly enhanced whereas that of [Ir(ppy)] 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 metal complexes, we discuss some directions for future development.
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| http://dx.doi.org/10.1002/anie.202319047 | DOI Listing |
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