Published in
Wiley, Angewandte Chemie International Edition, 7(54), p. 2084-2089
Wiley, Angewandte Chemie, 7(127), p. 2112-2117, 2015
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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
,
Wai-Lun Kwong,
Kam-Hung Low,
Chi-Chung Kwok,
Chensheng Ma,
Chi-Ming Che
Full text: Unavailable
Abstract
Luminescent pincer-type PtII complexes supported by C-deprotonated π-extended tridentate R[BOND]C^N^N[BOND]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[BOND]C^N^N[BOND]R′)(C[TRIPLE BOND]C-C6F5)] on the positional isomers of the tridentate ligand. Pt complexes [Pt(R-C^N^N[BOND]R′)(C[TRIPLE BOND]C-Ar)] are efficient photocatalysts for visible-light-induced reductive C[BOND]C bond formation. The [Pt(R-C^N^N[BOND]R′)(C[TRIPLE BOND]C-C6F5)] 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).