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Charge-tunable indium-organic frameworks built from cationic, anionic, and neutral building blocks.

Fei Bu1, Qipu Lin, Quan-Guo Zhai

  • 1Department of Chemistry, University of California, Riverside, California 92521, USA. pingyun.feng@ucr.edu.

Dalton Transactions (Cambridge, England : 2003)
|August 29, 2015
PubMed
Summary

Researchers synthesized indium-based metal-organic frameworks (In-MOFs) using 2,5-furandicarboxylic acid. Varying the indium to ligand ratio enabled control over framework charge, from positive trimers to negative monomers.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Coordination Chemistry

Background:

  • Metal-organic frameworks (MOFs) offer tunable properties for diverse applications.
  • Controlling the charge and structure of MOF building blocks is crucial for advanced material design.
  • Indium-based MOFs (In-MOFs) present unique opportunities due to indium's versatile coordination chemistry.

Purpose of the Study:

  • To explore the synthesis of novel indium-based building blocks using 2,5-furandicarboxylic acid (FDA).
  • To investigate the impact of synthetic conditions, specifically the indium(III) to FDA ratio, on the resulting structures.
  • To achieve tunable framework charges in In-MOFs by controlling the assembly of these building blocks.

Main Methods:

  • Systematic variation of the indium(III) to 2,5-furandicarboxylic acid (In(3+)/FDA) molar ratio.
  • Crystallization and characterization of indium-containing inorganic building units.
  • Analysis of structural and charge properties of the synthesized materials.

Main Results:

  • Three distinct indium-based building blocks were successfully synthesized using the same ligand, FDA.
  • A charge-switching phenomenon was observed, transitioning from a positively charged trimer to a negatively charged monomer.
  • The ability to control building block charge facilitated the synthesis of In-MOFs with tunable framework charges.

Conclusions:

  • The In(3+)/FDA ratio is a critical parameter for directing the formation of specific indium building blocks.
  • This synthetic strategy allows for the rational design of In-MOFs with predetermined framework charges.
  • The charge-tunable building blocks offer new possibilities for designing functional In-MOFs.