Bis(tridentate) ruthenium-terpyridine complexes featuring microsecond excited-state lifetimes.
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+).
Department of Chemistry, Centre for Advanced Solar Materials, University of Calgary, Calgary, Canada.
Douglas G
DG
Brown
Nawaporn
N
Sanguantrakun
Benjamin
B
Schulze
Ulrich S
US
Schubert
Curtis P
CP
Berlinguette
D056831:Coordination Complexes / Q000737:chemistry*; D008024:Ligands; D008697:Methane / Q000031:analogs & derivatives* / Q000737:chemistry; D011725:Pyridines / Q000737:chemistry*; D012428:Ruthenium / Q000737:chemistry*
D056831:Coordination Complexes; D008024:Ligands; D011725:Pyridines; C030011:carbene; D012428:Ruthenium; D008697:Methane