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Near‐IR Phosphorescent Ruthenium(II) and Iridium(III) Perylene Bisimide Metal Complexes
Author(s) -
Schulze Marcus,
Steffen Andreas,
Würthner Frank
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201410437
Subject(s) - phosphorescence , iridium , ruthenium , perylene , photochemistry , chemistry , intersystem crossing , quantum yield , transition metal , fluorescence , molecule , catalysis , organic chemistry , physics , excited state , quantum mechanics , nuclear physics , singlet state
The phosphorescence emission of perylene bisimide derivatives has been rarely reported. Two novel ruthenium(II) and iridium(III) complexes of an azabenz‐annulated perylene bisimide (ab‐PBI), [Ru(bpy) 2 (ab‐PBI)][PF 6 ] 2 1 and [Cp*Ir(ab‐PBI)Cl]PF 6 2 are now presented that both show NIR phosphorescence between 750–1000 nm in solution at room temperature. For an NIR emitter, the ruthenium complex 1 displays an unusually high quantum yield ( Φ p ) of 11 % with a lifetime ( τ p ) of 4.2 μs, while iridium complex 2 exhibits Φ p <1 % and τ p =33 μs. 1 and 2 are the first PBI‐metal complexes in which the spin–orbit coupling is strong enough to facilitate not only the S n →T n intersystem crossing of the PBI dye, but also the radiative T 1 →S 0 transition, that is, phosphorescence.