We describe the synthesis, electrochemistry, photophysics, computational analysis and electrochemiluminescence (ECL) of a new series of oxazaborine molecules. Our strategy is based on the modification of the coumarin-oxazaborine moiety to be directly joined through a carbon-carbon bond, forming donoracceptor (D-A) chromophores. These new structures substantially change the electron distribution as well as photophysical and electrochemical behaviors with a strong effect on the final quantum yield. For all compounds, we observed a very high PL quantum yield (70-75 %) and relatively accessible first oxidation and first reduction. All of these characteristics allow us to study the ECL of these molecules, obtaining a very high ECL efficiency that is four times higher than the standard dyes, opening the application of oxazaborine as bright ECL luminophores.
The Cover Feature shows the generation of electrochemiluminescence from oxazaborines, which is produced by the reaction between electrochemically generated D+ and A‐ molecules presented as a spherical shape. These molecules generate an excited state and light emission, in which the different colour is highlighted by the rainbow in background.More information can be found in the Article by T. Mikysek et al.
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