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Green Light Activation of Push‐Pull Ruthenium(II) Complexes by Moll, Johannes; Wang, Cui; Päpcke, Ayla; Förster, Christoph; Resch-Genger, Ute; Lochbrunner, Stefan; Heinze, Katja is a Chemistry article available to read on EtoBox.

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## Abstract Synthesis, characterization, electrochemistry, and photophysics of homo‐ and heteroleptic ruthenium(II) complexes [Ru(cpmp)~2~]^2+^ (**2^2+^**) and [Ru(cpmp)(ddpd)]^2+^ (**3^2+^**) bearing the tridentate ligands 6,2’’‐carboxypyridyl‐2,2’‐methylamine‐pyridyl‐pyridine (cpmp) and __N__,__N__’‐dimethyl‐__N__,__N__’‐dipyridin‐2‐ylpyridine‐2,6‐diamine (ddpd) are reported. The complexes possess one (**3^2+^**) or two (**2^2+^**) electron‐deficient dipyridyl ketone fragments as electron‐accepting sites enabling intraligand charge transfer (ILCT), ligand‐to‐ligand charge transfer (LL'CT) and low‐energy metal‐to‐ligand charge transfer (MLCT) absorptions. The latter peak around 544 nm (green light). Complex **2^2+^** shows ^3^MLCT phosphorescence in the red to near‐infrared spectral region at room temperature in deaerated acetonitrile solution with an emission quantum yield of 1.3 % and a ^3^MLCT lifetime of 477 ns, whereas **3^2+^** is much less luminescent. This different behavior is ascribed to the energy gap law and the shape of the parasitic excited ^3^MC state potential energy surface. This study highlights the importance of the excited‐state energies and geometries for the

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Author

Moll, Johannes; Wang, Cui; Päpcke, Ayla; Förster, Christoph; Resch-Genger, Ute; Lochbrunner, Stefan; Heinze, Katja

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Ltd.; Wiley (ISSN 0947-6539)

Published

2020

Language

EN

Field

Chemistry (Physical Sciences)