title: Improvement in phosphorescence efficiency through tuning of coordination geometry of tridentate cyclometalated platinum(II) complexes.
abstract: A series of tridentate cyclometalated platinum(II) complexes (C(∧)N*N)PtL (L = Cl or acetylide) featuring a fused five-six-membered metallacycle were synthesized. The structure of the complexes was confirmed by X-ray crystallography. In contrast to the C(∧)N(∧)N platinum complexes with a fused five-five-membered metallacycle, the platinum coordination in C(∧)N*N complexes is much closer to a square planar geometry. The photophysical properties of the complexes were studied. The geometrical change from C(∧)N(∧)N to C(∧)N*N led to a substantial improvement in phosphorescence efficiency of the complexes with an acetylide ligand in solution at room temperature. For example, the quantum yield of (C(∧)N*N)PtCCPh was measured to be 56%, demonstrating a big jump from 4% reported for (C(∧)N(∧)N)PtCCPh.
authors.affiliation: Department of Chemistry, East Carolina University, Greenville, North Carolina 27858, USA.
authors.forename: Deepak
authors.initials: D
authors.lastname: Ravindranathan
authors.forename: Dileep A K
authors.initials: DA
authors.lastname: Vezzu
authors.forename: Libero
authors.initials: L
authors.lastname: Bartolotti
authors.forename: Paul D
authors.initials: PD
authors.lastname: Boyle
authors.forename: Shouquan
authors.initials: S
authors.lastname: Huo
mesh_terms: D018360:Crystallography, X-Ray; D049449:Luminescence; D008958:Models, Molecular; D056004:Molecular Dynamics Simulation; D015394:Molecular Structure; D009944:Organoplatinum Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D009944:Organoplatinum Compounds