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Preparation of Highly Porous Coordination Polymer Coatings on Macroporous Polymer Monoliths for Enhanced Enrichment of Phosphopeptides
Published on: July 14, 2015
Constructing Denser Hydrogen-Bonding Networks in Polyoxometalate-Based Coordination Polymers for Enhancing Proton
Xin Zheng1, Xue-Song Wu1, Hong-Yan Li1
1School of Chemistry and Environmental Engineering, Jilin Provincial Science and Technology Innovation Center of Optical Materials and Chemistry; Jilin Provincial International Joint Research Center of Photo-functional Materials and Chemistry, Changchun University of Science and Technology, Changchun 130022, China.
Abstract:
It is urgent and significant to design and fabricate long-range ordered crystalline proton-conductive materials and study their proton conduction mechanisms. Two new polyoxometalate-based coordination polymers, named CUST-963 and CUST-964, have been constructed by combining Keggin-type H4SiW12O40 (SiW12), nitrogen-rich ligand 2,5-di(1H-imidazole-1-yl)terephthalic acid (H2DTA), and transition metal ions under hydrothermal conditions. X-ray diffraction analysis revealed that there are more uncoordinated nitrogen sites within CUST-963, which can collaboratively form a denser and continuous hydrogen-bonding network with surface oxygen atoms of SiW12 and water molecules and act as proton hopping sites. The alternating current impedance tests suggested CUST-963 achieves a lower activation energy (0.14 eV) and a higher proton conductivity (1.88 × 10-2 S cm-1) than that of CUST-964 under 95 °C and 98% relative humidity. This work provided an effective strategy for designing high-performance proton-conductive materials.
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