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N-N-Bridged Polynuclear POM-Based Coordination Polymers Based on a V-Type Ligand: Proton Conduction and Magnetism
Hui-Jie Lun1, Zhi-Min Zhang1, Ya-Hao Sun1
1Henan Key Laboratory of Polyoxometalate, College of Chemistry and Molecular Sciences, Henan University, Kaifeng, Henan 475004, P.R. China.
Inorganic Chemistry
|October 6, 2023
Summary
Four new polyoxometalate (POM)-based coordination polymers were synthesized. These materials show promise for proton conductivity applications, with composite membranes exhibiting enhanced performance, and also display interesting magnetic properties.
Area of Science:
- Inorganic Chemistry
- Materials Science
- Supramolecular Chemistry
Background:
- Polyoxometalates (POMs) and nitrogen heterocyclic ligands are building blocks for advanced materials.
- POM-based coordination polymers offer tunable structures for applications in proton conductivity and magnetism.
- Diverse structural motifs can be achieved by combining POMs with organic linkers.
Purpose of the Study:
- To synthesize and characterize novel POM-based coordination polymers using a specific nitrogen heterocyclic ligand.
- To investigate the structural diversity and topological features of the synthesized compounds.
- To evaluate the proton conductivity and magnetic properties of the new materials.
Main Methods:
- Solvothermal synthesis of four new POM-based coordination polymers.
- Single-crystal X-ray diffraction for structural determination.
- Proton conductivity measurements under varying humidity and temperature.
- Magnetic susceptibility measurements.
Main Results:
- Four new POM-based coordination polymers (1-4) were successfully synthesized using the btb ligand.
- Compounds 1-3 exhibit 2D structures with varying metal-ligand arrangements and POM coordination modes.
- Compound 4 displays a 3D framework constructed from trinuclear copper subunits and Strandberg-type anions.
- All compounds show significant proton conductivity, with composite membranes of 2 and 4 demonstrating enhanced performance.
- Compounds 1, 3, and 4 exhibit antiferromagnetic behavior.
Conclusions:
- The study successfully demonstrates the construction of diverse 2D and 3D POM-based coordination polymers.
- The synthesized materials show potential for proton conduction applications, especially in composite forms.
- The magnetic properties indicate antiferromagnetic interactions within specific compounds.
- This work provides insights into the rational design of POM-based materials for energy-related applications.
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