A series of heteroleptic bis(tridentate) ruthenium(II) complexes, each bearing a substituted 2,2':6',2″-terpyridine (terpy) ligand, is characterized by room temperature microsecond excited-state lifetimes. This observation is a consequence of the strongly σ-donating and weakly π-accepting tridentate carbene ligand, 2',6'-bis(1-mesityl-3-methyl-1,2,3-triazol-4-yl-5-idene)pyridine (C^N^C), adjacent to the terpy maintaining a large separation between the ligand field and metal-to-ligand charge transfer (MLCT) states while also preserving a large (3)MLCT energy. The observed lifetimes are the highest documented lifetimes for unimolecular ruthenium(II) complexes and are four orders in magnitude higher than that associated with [Ru(terpy)(2)](2+).
Benjamin Schulze, Daniel Escudero, Christian Friebe, Ronald Siebert, Helmar Görls, Stephan Sinn, Martin A. Thomas, Sebastian Mai, Jürgen Popp, Benjamin Dietzek, Leticia González, Ulrich Sigmar Schubert
Stephan Sinn, Benjamin Schulze, Christian Friebe, D. G. Brown, Michael Jäger, Joachim Kübel, Benjamin Dietzek, Curtis P. Berlinguette, Ulrich Sigmar Schubert
Stephan Sinn, Benjamin Schulze, Christian Friebe, D. G. Brown, Michael Jäger, Esra Altuntaş, Joachim Kübel, Oliver Guntner, Curtis P. Berlinguette, Benjamin Dietzek, Ulrich Sigmar Schubert
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