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Solvent-dependent zinc(II) coordination polymers with mixed ligands: selective sorption and fluorescence sensing
Ji-Ai Hua1, Yue Zhao, Yan-Shang Kang
1Coordination Chemistry Institute, State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing National Laboratory of Microstructures, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China. sunwy@nju.edu.cn.
Dalton Transactions (Cambridge, England : 2003)
|June 3, 2015
Summary
Two novel zinc(II) coordination polymers were synthesized, demonstrating selective adsorption of carbon dioxide over nitrogen and selective detection of acetone using fluorescence quenching. These materials offer potential for gas separation and chemical sensing applications.
Area of Science:
- Materials Chemistry
- Coordination Chemistry
- Supramolecular Chemistry
Background:
- Metal-organic frameworks (MOFs) and coordination polymers (CPs) are widely studied for their diverse structures and potential applications.
- Tuning ligand combinations and solvent systems allows for the rational design of novel network architectures.
- Developing materials for selective gas adsorption and chemical sensing remains a key challenge in materials science.
Purpose of the Study:
- To synthesize and characterize novel zinc(II) coordination polymers using specific organic ligands.
- To investigate the structural diversity and properties of the resulting coordination polymers.
- To evaluate the gas adsorption selectivity and sensing capabilities of the synthesized materials.
Main Methods:
- Solvothermal synthesis using metal salts (zinc(II)) and mixed organic ligands: 1,3,5-tris(1-imidazolyl)benzene (tib) and 2-bromo-1,4-benzenedicarboxylic acid (H2BDC-Br).
- Utilized different solvent systems (DMF/H2O and DMF/EtOH/H2O) to control the formation of distinct coordination polymer structures.
- Characterization of the coordination polymers through structural analysis and gas adsorption/sensing experiments.
Main Results:
- Two novel zinc(II) coordination polymers, [Zn2(tib)2(BDC-Br)]2·2SO4·17H2O (1) and [Zn4(tib)2(BDC-Br)3(H2O)4SO4]·7.5H2O·2.5DMF (2), were successfully synthesized.
- Compound 1 exhibits an unusual (3,4)-connected 3D net topology ({4·8·10(4)}{4·8·10}), while compound 2 forms a 1D chain with 3D supramolecular assembly via hydrogen bonding.
- Both compounds demonstrated selective adsorption of carbon dioxide (CO2) over nitrogen (N2) and selective detection of acetone via fluorescence quenching.
Conclusions:
- The choice of solvent system significantly influences the resulting coordination polymer structure and dimensionality.
- The synthesized zinc(II) coordination polymers possess potential for selective CO2 capture and N2 separation.
- These materials show promise as fluorescent sensors for the selective detection of acetone.
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