Bis(tridentate) Ruthenium-Terpyridine Complexes Featuring Microsecond Excited-State Lifetimes |
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| Authors: | Douglas G Brown Nawaporn Sanguantrakun Benjamin Schulze Ulrich S Schubert Curtis P Berlinguette |
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| Institution: | Department of Chemistry, Centre for Advanced Solar Materials, and Institute Sustainable Energy, Environment and Economy, University of Calgary , 2500 University Drive N.W., Calgary, Canada, T2N-1N4. |
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| Abstract: | 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+). |
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