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In-MOFs based on amide functionalised flexible linkers.

J Haddad1, G F S Whitehead, A P Katsoulidis

  • 1Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, UK. rossein@liverpool.ac.uk.

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|June 15, 2017
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Summary
This summary is machine-generated.

Two novel indium-based metal-organic frameworks, In(OH)CSA and In(OH)PDG, were synthesized. Their distinct linker designs create varied pore structures and accessible volumes, impacting potential applications.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Crystallography

Background:

  • Metal-organic frameworks (MOFs) offer tunable porous structures for diverse applications.
  • Indium-based MOFs are less explored compared to other transition metals.
  • Flexible linkers can introduce unique structural motifs and functionalities in MOFs.

Purpose of the Study:

  • To synthesize and characterize two new amide-functionalized indium(III) hydroxide-based metal-organic frameworks.
  • To investigate the impact of flexible dicarboxylate linkers on the resulting framework topology, pore characteristics, and supramolecular interactions.
  • To compare the structural features and pore environments of the synthesized MOFs.

Main Methods:

  • Solvothermal synthesis of indium-based MOFs using flexible linkers: N-(4-carboxyphenyl)succinamic acid (CSA) and N,N'-(1,4-phenylenedicarbonyl)diglycine (PDG).
  • Single-crystal X-ray diffraction for structural determination of In(OH)CSA and In(OH)PDG.
  • Analysis of supramolecular interactions, including hydrogen bonding, and pore accessibility calculations.

Main Results:

  • Successful synthesis of two new indium(III) hydroxide-based MOFs: In(OH)CSA and In(OH)PDG.
  • Both frameworks feature trans indium hydroxide chains interconnected by dicarboxylate linkers, forming 2D layers.
  • In(OH)CSA exhibits close packing with small pores due to lack of hydrogen bonding between linkers.
  • In(OH)PDG displays significant intra- and interlayer hydrogen bonding, leading to larger cylindrical pores with 25% accessible volume.

Conclusions:

  • The choice of flexible linker significantly influences the supramolecular assembly and pore architecture in indium-based MOFs.
  • Hydrogen bonding plays a crucial role in dictating layer packing and pore formation in these materials.
  • The distinct pore characteristics of In(OH)CSA and In(OH)PDG suggest potential for selective guest inclusion or separation applications.