A Mechanochromic and Vapochromic Luminescent Cuprous Complex Based on a Switchable Intramolecular π···π Interaction
Ping Yu1, Dan Peng1, Li-Hua He1
1Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry, Department of Materials, Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, People's Republic of China.
Inorganic Chemistry
|December 24, 2021
Summary
This study reveals a novel tetranuclear cuprous luminescent complex with stimuli-responsive properties. Its distinct crystalline polymorphs exhibit color changes upon grinding or solvent exposure, offering potential for intelligent materials.
Area of Science:
- Coordination Chemistry
- Materials Science
- Luminescence
Background:
- Stimuli-responsive luminescent materials are crucial for advanced technologies.
- Understanding the relationship between molecular structure and luminescence is key.
- Tetranuclear cuprous complexes offer unique photophysical properties.
Purpose of the Study:
- To investigate a novel tetranuclear cuprous luminescent complex.
- To explore the origin and applications of its stimuli-responsive luminescence.
- To elucidate the role of structural features in luminescence changes.
Main Methods:
- Synthesis and crystallization of tetranuclear cuprous complex polymorphs.
- Characterization using single-crystal X-ray diffraction, PXRD, FT-IR, TGA, and PL spectroscopy.
- Computational analysis using TD-DFT.
Main Results:
- Two crystalline polymorphs with distinct blue and yellow emissions were obtained.
- Grinding induced a blue-to-yellow emission shift in one polymorph.
- Acetone vapor exposure reversed the emission color, demonstrating mechanochromism.
Conclusions:
- Switchable intramolecular π···π interactions and {Cu(μ-dppm)2Cu} geometry drive stimuli-responsive luminescence.
- The complex shows potential for optical sensing and anticounterfeiting applications.
- This work provides a route for developing intelligent luminescent materials.
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