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Updated: Apr 19, 2026

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
Published on: April 10, 2015
Near-IR phosphorescent ruthenium(II) and iridium(III) perylene bisimide metal complexes
Marcus Schulze1, Andreas Steffen, Frank Würthner
1Universität Würzburg, Institut für Organische Chemie and Center for Nanosystems Chemistry, Am Hubland, 97074 Würzburg (Germany).
Abstract:
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)][PF6 ]2 1 and [Cp*Ir(ab-PBI)Cl]PF6 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 (Φp ) of 11 % with a lifetime (τp ) of 4.2 μs, while iridium complex 2 exhibits Φp <1 % and τp =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 Sn →Tn intersystem crossing of the PBI dye, but also the radiative T1 →S0 transition, that is, phosphorescence.
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