Luminescence and Light‐Driven Energy and Electron Transfer from an Exceptionally Long‐Lived Excited State of a Non‐Innocent Chromium(III) Complex |
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| Authors: | Steffen Treiling,Cui Wang,Christoph F rster,Florian Reichenauer,Jens Kalmbach,Pit Boden,Joe P. Harris,Luca M. Carrella,Eva Rentschler,Ute Resch‐Genger,Christian Reber,Michael Seitz,Markus Gerhards,Katja Heinze |
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| Affiliation: | Steffen Treiling,Cui Wang,Christoph Förster,Florian Reichenauer,Jens Kalmbach,Pit Boden,Joe P. Harris,Luca M. Carrella,Eva Rentschler,Ute Resch‐Genger,Christian Reber,Michael Seitz,Markus Gerhards,Katja Heinze |
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| Abstract: | Photoactive metal complexes employing Earth‐abundant metal ions are a key to sustainable photophysical and photochemical applications. We exploit the effects of an inversion center and ligand non‐innocence to tune the luminescence and photochemistry of the excited state of the [CrN6] chromophore [Cr(tpe)2]3+ with close to octahedral symmetry (tpe=1,1,1‐tris(pyrid‐2‐yl)ethane). [Cr(tpe)2]3+ exhibits the longest luminescence lifetime (τ=4500 μs) reported up to date for a molecular polypyridyl chromium(III) complex together with a very high luminescence quantum yield of Φ=8.2 % at room temperature in fluid solution. Furthermore, the tpe ligands in [Cr(tpe)2]3+ are redox non‐innocent, leading to reversible reductive chemistry. The excited state redox potential and lifetime of [Cr(tpe)2]3+ surpass those of the classical photosensitizer [Ru(bpy)3]2+ (bpy=2,2′‐bipyridine) enabling energy transfer (to oxygen) and photoredox processes (with azulene and tri(n‐butyl)amine). |
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| Keywords: | Reichhaltig vorkommende Metalle Laporte-Regel Lumineszenz Photoredoxchemie Nachhaltige Chemie |
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