Microsecond Excited-State Lifetimes in Bistridentate Ruthenium-Terpyridine Complexes
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Brown, Douglas; Sanguantrakun, Nawaporn; Schulze, Benjamin; Schubert, Ulrich S.; Berlinguette, Curtis
- 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-toligand
charge transfer (MLCT) states while also preserving
a large 3MLCT 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+.
- Year:
- 2012
- Type of Publication:
- Article
- Journal:
- Journal of the American Chemical Society
- Volume:
- 134
- Pages:
- 12354 - 12375