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Deuterated Molecular Ruby with Record Luminescence Quantum Yield
Author(s) -
Wang Cui,
Otto Sven,
Dorn Matthias,
Kreidt Elisabeth,
Lebon Jakob,
Sršan Laura,
Di MartinoFumo Patrick,
Gerhards Markus,
ReschGenger Ute,
Seitz Michael,
Heinze Katja
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201711350
Subject(s) - quantum yield , intersystem crossing , microsecond , excited state , luminescence , chemistry , photochemistry , coordination sphere , ligand (biochemistry) , yield (engineering) , pyridine , metal , atomic physics , materials science , fluorescence , physics , optoelectronics , biochemistry , receptor , organic chemistry , quantum mechanics , metallurgy , astronomy , singlet state , medicinal chemistry
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.