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

Molecular Ruby under Pressure

The intensely luminescent chromium(III) complexes [Cr(ddpd)2 ]3+ and [Cr(H2 tpda)2 ]3+ show surprising pressure-induced red shifts of up to -15 cm-1  kbar-1 for their sharp spin-flip emission bands (ddpd=N,N'-dimethyl-N,N'-dipyridine-2-yl-pyridine-2,6-diamine; H2 tpda=2,6-bis(2-pyridylamino)pyridine). These shifts surpass that of the established standard, ruby Al2 O3 :Cr3+ , by a factor of 20. Beyond the common application in the crystalline state, the very high quantum yield of [Cr(ddpd)2 ]3+ enables optical pressure sensing in aqueous and methanolic solution. These unique features of the molecular rubies [Cr(ddpd)2 ]3+ and [Cr(H2 tpda)2 ]3+ pave the way for highly sensitive optical pressu…

Molekularer Rubin unter Druck

Luminescence and Light‐Driven Energy and Electron Transfer from an Exceptionally Long‐Lived Excited State of a Non‐Innocent Chromium(III) Complex

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, …

CCDC 1876390: Experimental Crystal Structure Determination

Related Article: Steffen Treiling, Cui Wang, Christoph Fçrster, Florian Reichenauer, Jens Kalmbach, Pit Boden, Joe P. Harris, Luca M. Carrella, Eva Rentschler, Ute Resch-Genger, Christian Reber, Michael Seitz, Markus Gerhards, and Katja Heinze|2019|Angew.Chem.,Int.Ed.|58|18075|doi:10.1002/anie.201909325

CCDC 1876389: Experimental Crystal Structure Determination

Related Article: Steffen Treiling, Cui Wang, Christoph Fçrster, Florian Reichenauer, Jens Kalmbach, Pit Boden, Joe P. Harris, Luca M. Carrella, Eva Rentschler, Ute Resch-Genger, Christian Reber, Michael Seitz, Markus Gerhards, and Katja Heinze|2019|Angew.Chem.,Int.Ed.|58|18075|doi:10.1002/anie.201909325