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Microstructural Modulation of Isomorphic Luminescent Coordination Polymers To Achieve Sensing Effect Transformation
Jinfang Zhang1, Xingyu Tao1, Shuaixing Wang1
1International Joint Research Center for Photoresponsive Molecules and Materials, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, P. R. China.
Two new coordination polymers, 1 and 2, were synthesized using AIE ligands L-1 and L-2. They exhibit distinct "turn-off" and "turn-on" sensing capabilities for permanganate ions (MnO4-), respectively.
Area of Science:
- Materials Science
- Supramolecular Chemistry
- Chemical Sensing
Background:
- Developing novel materials for selective ion detection is crucial.
- Coordination polymers offer tunable structures for sensing applications.
- Aggregation-Induced Emission (AIE) functional ligands can enhance luminescence properties.
Purpose of the Study:
- To design and synthesize isomorphic coordination polymers with distinct sensing behaviors.
- To investigate the structure-property relationships governing permanganate ion (MnO4-) sensing.
- To explore microstructural modulation for transforming sensing effects.
Main Methods:
- Synthesis of two AIE functional ligands, L-1 and L-2.
- Construction of isomorphic coordination polymers [Cu(L-1)2(SCN)2] (1) and [Cu(L-2)2(SCN)2] (2).
- Characterization of crystal structures, stability, and luminescence properties.
- Evaluation of sensing performance towards permanganate ions (MnO4-).
Main Results:
- Compounds 1 and 2 possess 1-D single-chain architectures and exhibit good stability.
- Ligand stacking distances (4.61 Å in 1, 5.38 Å in 2) influence sensing mechanisms.
- Compound 1 shows 'turn-off' luminescence sensing for MnO4-.
- Compound 2 demonstrates 'turn-on' luminescence sensing for MnO4- with ultrahigh sensitivity, marking the first such sensor.
Conclusions:
- Microstructural modulation via ligand design enables distinct sensing transformations.
- The developed coordination polymers offer promising platforms for selective ion detection.
- Compound 2 represents a significant advancement in 'turn-on' permanganate ion sensing.
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