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Luminescent Pincer Platinum(II) Complexes with Emission Quantum Yields up to Almost Unity: Photophysics, Photoreductive CC Bond Formation, and Materials Applications
Author(s) -
Chow PuiKeong,
Cheng Gang,
Tong Glenna So Ming,
To WaiPong,
Kwong WaiLun,
Low KamHung,
Kwok ChiChung,
Ma Chensheng,
Che ChiMing
Publication year - 2015
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201408940
Subject(s) - pincer movement , chemistry , platinum , photochemistry , phosphorescence , oled , luminescence , excited state , deprotonation , ligand (biochemistry) , quantum efficiency , fluorescence , crystallography , materials science , catalysis , optoelectronics , organic chemistry , atomic physics , ion , biochemistry , physics , receptor , layer (electronics) , quantum mechanics
Luminescent pincer‐type Pt II complexes supported by C‐deprotonated π‐extended tridentate RC^N^NR′ 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(RC^N^NR′)(CC‐C 6 F 5 )] on the positional isomers of the tridentate ligand. Pt complexes [Pt(R‐C^N^NR′)(CC‐Ar)] are efficient photocatalysts for visible‐light‐induced reductive CC bond formation. The [Pt(R‐C^N^NR′)(CC‐C 6 F 5 )] 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).