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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 (CNC), 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+).
Brown et al. (Wed,) studied this question.
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