Luminescent Pincer Platinum(II) Complexes with Emission Quantum Yields up to Almost Unity: Photophysics, Photoreductive CC Bond Formation, and Materials Applications

• DOI: 10.1002/anie.201408940
• Publication Date: 2015-01-09T20:50:45Z
• Authors: Pui‐Keong Chow; Gang Cheng; Glenna So Ming Tong; Wai‐Pong To; Wai‐Lun Kwong; Kam‐Hung Low; Chi‐Chung Kwok; Chensheng Ma; Chi‐Ming Che
• Keywords: Quantum Efficiency

Luminescent pincer-type Pt(II) complexes supported by C-deprotonated π-extended tridentate RC^N^NR' ligands and pentafluorophenylacetylide show emission quantum yields up to almost unity. Femtosecond time-resolved fluorescence measurements time-dependent DFT calculations together reveal the dependence of excited-state structural distortions [Pt(RC^N^NR')(CC-C6 F5 )] on positional isomers ligand. Pt [Pt(R-C^N^NR')(CC-Ar)] are efficient photocatalysts for visible-light-induced reductive CC bond formation. The [Pt(R-C^N^NR')(CC-C6 perform strongly as phosphorescent dopants green- red-emitting organic light-emitting diodes (OLEDs) with external efficiency values over 22.1 %. These also applied in two-photon cellular imaging when incorporated into mesoporous silica nanoparticles (MSNs).