A series of luminescent tridentate cyclometalated platinum(II) complexes (CN*N)PtL (L = Cl or acetylide) featuring a fused five-six-membered metallacycle were synthesized. The structures of these complexes were confirmed by X-ray crystallography. In contrast to the reported C N N platinum complexes with a fused five-five-membered metallacycle, the platinum coordination in C N*N complexes attains much closer to 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 dramatic increase from 4% reported for (C N N)PtCCPh. 

Improvement in phosphorescence efficiency through tuning of coordination geometry of tridentate cyclometalated platinum(II) complexes

241st National Meeting (2011)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.