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Mechanochromic and Selective Vapochromic Solid-State Luminescence of a Dinuclear Cuprous Complex
Rui Zhang1, Jin-Wang Liu1, Wei-Yong Zhong1
1Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry, School of Chemistry and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, People's Republic of China.
Inorganic Chemistry
|July 10, 2023
Summary
This study reveals a new copper complex exhibiting mechanochromic and vapochromic luminescence. Its color changes are driven by solvent-induced alterations in hydrogen bonds and π-π interactions, offering insights for designing responsive materials.
Area of Science:
- Materials Science
- Supramolecular Chemistry
- Luminescence
Background:
- Stimuli-responsive luminescent materials are vital for advanced applications.
- Understanding their response mechanisms is key for precise synthesis and design.
Purpose of the Study:
- To report the mechanochromic and vapochromic properties of a novel bimetallic cuprous complex.
- To elucidate the underlying mechanisms of these stimuli-responsive behaviors.
Main Methods:
- Synthesis and characterization of the bimetallic cuprous complex [{Cu(bpmtzH)}2(μ-dppm)2](ClO4)2 (1).
- Investigation of solvated polymorphs (1·2CH2Cl2 (1-g) and 1·2CHCl3 (1-c)) and their luminescence properties.
- Analysis of structural changes induced by solvent vapor and grinding.
Main Results:
- Complex 1 exhibits selective vapochromism, interconverting between green (1-g) and cyan (1-c) emission upon exposure to CH2Cl2 and CHCl3 vapors.
- Mechanochromism was observed in both polymorphs, primarily due to grinding-induced disruption of intermolecular hydrogen bonds.
- Solvent-induced changes in both hydrogen bonds and intramolecular π-π interactions were identified, while grinding primarily affected hydrogen bonds.
Conclusions:
- The study provides a comprehensive understanding of the multi-stimuli-responsive luminescence mechanism in the bimetallic cuprous complex.
- It highlights the crucial roles of intermolecular hydrogen bonds and intramolecular π-π interactions in controlling luminescence output.
- These findings offer valuable insights for the rational design and synthesis of novel stimuli-responsive luminescent materials.
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