title: Blue-green emissive cationic iridium(III) complexes using partially saturated strongly-donating guanidyl-pyridine/-pyrazine ancillary ligands.
abstract: A new class of cationic iridium(III) complexes of the form [(C(∧)N)2Ir(N(∧)N)][PF6] is reported, where C(∧)N = cyclometallating 2-phenylpyridinato, ppy, or 2-(2,4-difluorophenyl)-5'-methylpyridinato, dFMeppy, and N(∧)N = guanidyl-pyridine, gpy, or -pyrazine, gpz, as the ancillary ligand. A large blue-shift in the emission coupled with a 7-to-9 fold enhancement in photoluminescence quantum yield and microsecond emission lifetimes were observed for the complexes containing the partially saturated gpy ligand as compared to the benchmark complex [(ppy)2Ir(bpy)][PF6], C1, where bpy is 2,2'-bipyridine.
authors.affiliation: Département de Chimie, Université de Montréal, 2900 Edouard-Montpetit, Montréal, Québec H3T-1J4, Canada. garry.hanan@umontreal.ca.
authors.forename: Kamrul
authors.initials: K
authors.lastname: Hasan
authors.forename: Amlan K
authors.initials: AK
authors.lastname: Pal
authors.forename: Thomas
authors.initials: T
authors.lastname: Auvray
authors.forename: Eli
authors.initials: E
authors.lastname: Zysman-Colman
authors.forename: Garry S
authors.initials: GS
authors.lastname: Hanan
mesh_terms: D002412:Cations; D056831:Coordination Complexes / Q000737:chemistry*; D019791:Guanidine / Q000737:chemistry*; D007495:Iridium / Q000737:chemistry*; D008024:Ligands; D049408:Luminescent Agents / Q000737:chemistry*; D008163:Luminescent Measurements; D008958:Models, Molecular; D015394:Molecular Structure; D011719:Pyrazines / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry*
chemical_list: D002412:Cations; D056831:Coordination Complexes; D008024:Ligands; D049408:Luminescent Agents; D011719:Pyrazines; D011725:Pyridines; D007495:Iridium; D019791:Guanidine; C023666:pyridine