Deuterated Molecular Ruby with Record Luminescence Quantum Yield |
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| Authors: | Cui Wang Sven Otto Matthias Dorn Elisabeth Kreidt Jakob Lebon Laura Sršan Patrick Di Martino‐Fumo Prof Markus Gerhards Dr Ute Resch‐Genger Prof Michael Seitz Prof Katja Heinze |
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| Institution: | 1. Division Biophotonics, Federal Institute for Materials Research and Testing (BAM), Berlin, Germany;2. Institut für Chemie und Biochemie, Freie Universit?t Berlin, Berlin, Germany;3. Institute of Inorganic Chemistry and Analytical Chemistry, Johannes Gutenberg University of Mainz, Mainz, Germany;4. Graduate School Materials Science in Mainz, Mainz, Germany;5. Institute of Inorganic Chemistry, University of Tübingen, Tübingen, Germany;6. Department of Chemistry and Research Center Optimas, University Kaiserslautern, Kaiserslautern, Germany |
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| Abstract: | The recently reported luminescent chromium(III) complex 1 3+ (Cr(ddpd)2]3+; ddpd=N,N′‐dimethyl‐N,N′‐dipyridine‐2‐yl‐pyridine‐2,6‐diamine) shows exceptionally strong near‐IR emission at 775 nm in water under ambient conditions (Φ=11 %) with a microsecond lifetime as the ligand design in 1 3+ effectively eliminates non‐radiative decay pathways, such as photosubstitution, back‐intersystem crossing, and trigonal twists. In the absence of energy acceptors, such as dioxygen, the remaining decay pathways are energy transfer to high energy solvent and ligand oscillators, namely OH and CH stretching vibrations. Selective deuteration of the solvents and the ddpd ligands probes the efficiency of these oscillators in the excited state deactivation. Addressing these energy‐transfer pathways in the first and second coordination sphere furnishes a record 30 % quantum yield and a 2.3 millisecond lifetime for a metal complex with an earth‐abundant metal ion in solution at room temperature. |
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| Keywords: | chromium deuteration excited states luminescence spin-flip |
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