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Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
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Highly Emissive Dinuclear Platinum(III) Complexes.

Xiugang Wu1, Deng-Gao Chen, Denghui Liu1

  • 1School of Materials Science and Engineering, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications, Jiangsu Key Laboratories of Environment-Friendly Polymers, National Experimental Demonstration Center for Materials Science and Engineering, Changzhou University, Changzhou 213164, China.

Journal of the American Chemical Society
|April 1, 2020
PubMed
Summary
This summary is machine-generated.

New dinuclear platinum(III) complexes with d7-d7 configuration exhibit intense phosphorescence. These complexes show potential for lighting applications, including organic light-emitting diodes (OLEDs).

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Photochemistry

Background:

  • Dinuclear platinum(III) complexes typically have short-lived triplet states, leading to weak photoluminescence.
  • Overcoming this limitation is crucial for developing efficient phosphorescent materials.

Purpose of the Study:

  • To design and synthesize novel dinuclear platinum(III) complexes with enhanced photoluminescence.
  • To investigate the photophysical properties and potential applications of these complexes in lighting and organic light-emitting diodes (OLEDs).

Main Methods:

  • Synthesis of dinuclear platinum(III) complexes (Pt2a-Pt2c) using donor-acceptor type oxadiazole-thiol chelates.
  • Photoluminescence spectroscopy (solution, crystalline powder, thin film) to characterize emission properties.
  • Time-dependent density functional theory (TD-DFT) for electronic transition analysis.
  • Fabrication and testing of organic light-emitting diodes (OLEDs) using Pt2a as an emitter.

Main Results:

  • Pt2a-Pt2c complexes exhibit intense phosphorescence with d7-d7 electronic configuration.
  • Pt2a shows orange emission (618 nm) in solution and near-infrared (NIR) emission (749 nm in powder, 704 nm in film).
  • Mechanically grinding Pt2a induces blue-shifted emission, indicating intermolecular interactions.
  • TD-DFT confirms the lowest electronic transition as bridging ligand-metal-metal charge transfer (LMMCT).
  • OLEDs fabricated with Pt2a achieve NIR (716 nm), red (614 nm), and white-light emission with high efficiencies.

Conclusions:

  • The designed dinuclear platinum(III) complexes possess long-lived triplet states and intense phosphorescence.
  • These complexes demonstrate significant potential for applications in lighting and high-performance OLEDs.
  • The study highlights the successful strategy of using D-A type chelates to enhance photoluminescence in dinuclear platinum complexes.