title: Luminescent pincer platinum(II) complexes with emission quantum yields up to almost unity: photophysics, photoreductive C-C bond formation, and materials applications.
abstract: Luminescent pincer-type Pt(II)  complexes supported by C-deprotonated π-extended tridentate RC^N^NR' ligands and pentafluorophenylacetylide ligands show emission quantum yields up to almost unity. Femtosecond time-resolved fluorescence measurements and time-dependent DFT calculations together reveal the dependence of excited-state structural distortions of [Pt(RC^N^NR')(CC-C6 F5 )] on the positional isomers of the tridentate ligand. Pt complexes [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 F5 )] complexes perform strongly as phosphorescent dopants for green- and red-emitting organic light-emitting diodes (OLEDs) with external quantum efficiency values over 22.1 %. These complexes are also applied in two-photon cellular imaging when incorporated into mesoporous silica nanoparticles (MSNs).
authors.affiliation: State Key Laboratory of Synthetic Chemistry, Institute of Molecular Functional Materials, HKU-CAS Joint Laboratory on New Materials, Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong (P.R. China).
authors.forename: Pui-Keong
authors.initials: PK
authors.lastname: Chow
authors.forename: Gang
authors.initials: G
authors.lastname: Cheng
authors.forename: Glenna So Ming
authors.initials: GS
authors.lastname: Tong
authors.forename: Wai-Pong
authors.initials: WP
authors.lastname: To
authors.forename: Wai-Lun
authors.initials: WL
authors.lastname: Kwong
authors.forename: Kam-Hung
authors.initials: KH
authors.lastname: Low
authors.forename: Chi-Chung
authors.initials: CC
authors.lastname: Kwok
authors.forename: Chensheng
authors.initials: C
authors.lastname: Ma
authors.forename: Chi-Ming
authors.initials: CM
authors.lastname: Che
keywords: density functional calculations; luminescence; organic light-emitting diodes; photochemistry; platinum