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Rare-earth squarate frameworks with topology.

Zhe Wang1, Zhanning Liu1,2,3, Changsong Xie1

  • 1School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China. znliu@upc.edu.cn.

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Summary
This summary is machine-generated.

Researchers assembled squarate ligands with rare-earth ions to create novel (4, 8)-connected frameworks. The terbium-based material shows proton conductivity and luminescence, indicating potential for multifunctional applications.

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Area of Science:

  • Materials Science
  • Coordination Chemistry
  • Solid-State Chemistry

Background:

  • Squarate ligands (C4O4^2-) are planar, 4-connected molecules with D4h symmetry.
  • These ligands are known to form diverse network topologies through coordination with metal ions.
  • Rare-earth ions offer unique electronic and coordination properties for framework construction.

Purpose of the Study:

  • To explore the assembly of squarate ligands with rare-earth ions.
  • To synthesize and characterize novel coordination frameworks.
  • To investigate the functional properties, such as proton conductivity and luminescence, of the resulting materials.

Main Methods:

  • Hydrothermal synthesis was employed to construct the coordination frameworks.
  • Powder X-ray diffraction (PXRD) was used for structural characterization.
  • Proton conductivity measurements were performed under varying humidity conditions.
  • Luminescence spectroscopy was utilized to study the response to specific analytes.

Main Results:

  • A series of (4, 8)-connected frameworks with the 'smallest' type topology were successfully synthesized.
  • The terbium-based analogue demonstrated significant proton conductivity.
  • This terbium compound exhibited selective luminescence responses to permanganate (MnO4-) and dichromate (Cr2O7^2-) ions.

Conclusions:

  • The squarate ligand is effective in constructing complex (4, 8)-connected rare-earth frameworks.
  • The terbium-based material displays promising proton conductivity and luminescence sensing capabilities.
  • These findings highlight the potential of rare-earth squarate frameworks as multifunctional materials for sensing and energy applications.