Cover Picture: Luminescence and Light‐Driven Energy and Electron Transfer from an Exceptionally Long‐Lived Excited State of a Non‐Innocent Chromium(III) Complex (Angew. Chem. Int. Ed. 50/2019)

Abstract

Inversion symmetry increases the excited-state lifetime of a molecular ruby at room temperature in fluid solution to 4.5 ms while the photoluminescence quantum yield remains as high as 8.2 %, as shown by K. Heinze and co-workers in their Research Article on page 18075. The chromium(III) complex [Cr(tpe)2]3+ is furthermore competent in light-induced electron and energy transfer processes, and thus resembles classical noble metal complexes.