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Dual-Phase Multi-Stimuli-Responsive Luminescence from a Pentiptycene-Linked Binuclear Cyclometalated Platinum(II)
Ying-Feng Hsu1, Yu-Chieh Ho1, Yi-Hung Liu1
1Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan.
Inorganic Chemistry
|July 31, 2025
Summary
This study introduces a novel platinum complex with a flexible linker, enabling dual-phase luminochromic responses in both solution and solid states. This material changes color with various stimuli, offering new possibilities for responsive materials.
Area of Science:
- Materials Science
- Photochemistry
- Coordination Chemistry
Background:
- Stimuli-responsive molecular systems are crucial for advanced materials.
- Developing materials with consistent responses across different phases (solution and solid) remains a significant challenge.
Purpose of the Study:
- To design and synthesize a novel binuclear platinum(II) complex with dual-phase luminochromic response capabilities.
- To investigate the stimuli-responsive behaviors of this complex in both solution and solid states.
Main Methods:
- Synthesis of a bis(phenylsulfonyl)pentiptycene (BPSP)-linked binuclear N^C^N cyclometalated Pt(II) acetylide complex.
- Investigation of luminochromic responses to stimuli such as temperature, metal ions (Ag(I), Cu(I)), solvents (DMSO, THF), oxygen, mechanical grinding, and solvent vapor exposure.
Main Results:
- The complex exhibits dual-phase luminochromic responses (DPLR) to multiple stimuli in both solution and solid phases.
- In solution, stimuli induce a red-to-green emission switch by suppressing excimer formation.
- In the solid state, mechanical grinding causes a green-to-red emission switch, with partial recovery to orange emission upon exposure to benzene or ethyl acetate vapors.
Conclusions:
- A conformationally flexible linker (BPSP) is key to achieving dual-phase luminochromic behavior in binuclear Pt(II) complexes.
- This work demonstrates a versatile platform for developing advanced responsive materials with applications in sensing and display technologies.
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