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Five 8-hydroxyquinolinate-based coordination polymers with tunable structures and photoluminescent properties for
Liyan Zhang1, Liying Sun, Xinyuan Li
1School of Chemistry and Chemical Engineering Anhui University of Technology, Maanshan 243002, P. R. China. yuanguozan@163.com.
Dalton Transactions (Cambridge, England : 2003)
|November 5, 2014
Summary
Novel coordination polymers were synthesized and show potential for sensing nitroaromatic molecules. Compound 3 demonstrated superior sensitivity, quenching 2-nitrotoluene emission by 96% via fluorescence quenching.
Area of Science:
- Coordination Chemistry
- Materials Science
- Chemical Sensing
Background:
- 8-hydroxyquinolinate ligands are versatile building blocks for coordination polymers.
- Pyridyl group positioning influences the structural diversity and properties of coordination polymers.
- Fluorescence-based sensing offers a sensitive method for detecting volatile organic compounds.
Purpose of the Study:
- To synthesize and characterize novel coordination polymers using 8-hydroxyquinolinate ligands with varying pyridyl groups.
- To investigate the structural diversity and photophysical properties of the synthesized compounds.
- To evaluate the potential of these coordination polymers as sensors for nitroaromatic molecules in the vapor phase.
Main Methods:
- Synthesis of five novel coordination polymers: [Zn3(L1)6] (1), [Zn(L1)2]·2MeOH (2), [Zn(L2)2] (3), [Cd(L2)2] (4), and [Cd4(L1)6]·13H2O (5).
- Characterization using various techniques, including single-crystal X-ray diffraction.
- Investigation of fluorescence emission, lifetimes, and sensing behavior towards nitroaromatic vapors.
Main Results:
- Structural diversification observed in coordination polymers due to metal choice and pyridyl nitrogen position.
- All five compounds exhibited fluorescence emissions and lifetimes in the solid state.
- All polymers demonstrated vapor-phase sensing of nitroaromatic molecules via fluorescence quenching.
- Compound 3 showed superior sensitivity, with 2-nitrotoluene quenching its emission by 96%.
Conclusions:
- The synthesized coordination polymers exhibit tunable structures and photophysical properties.
- These materials are effective fluorescent sensors for nitroaromatic compounds in the vapor phase.
- Compound 3 represents a highly sensitive material for detecting specific nitroaromatic analytes.
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