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Open metal-organic framework containing cuprate chains.

Dat T Tran1, Xiaojuan Fan, Daniel P Brennan

  • 1Department of Chemistry and Biochemistry, University of California, Santa Cruz, 1156 High Street, Santa Cruz, California 95064, USA.

Inorganic Chemistry
|August 30, 2005
PubMed
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A novel copper-based metal-organic framework was synthesized and characterized. This material exhibits one-dimensional antiferromagnetic ordering within its copper chains, with potential for guest molecule removal.

Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Solid-State Chemistry

Background:

  • Metal-organic frameworks (MOFs) offer tunable structures for diverse applications.
  • Copper-based MOFs are of interest due to their catalytic and magnetic properties.
  • Understanding the structural and magnetic behavior of novel MOFs is crucial for materials design.

Purpose of the Study:

  • To synthesize and characterize a new three-dimensional Cu(II) metal-organic framework.
  • To investigate the structural, thermal, and magnetic properties of the synthesized material.
  • To explore the potential for guest molecule removal and its impact on stability.

Main Methods:

  • Hydrothermal synthesis using copper nitrate and p-pyridinecarboxylic acid.
  • Single-crystal X-ray diffraction for structural determination.

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  • Thermogravimetric analysis (TGA) for thermal stability and guest molecule assessment.
  • Magnetic susceptibility measurements and data fitting to the Bonner-Fisher model.

    • Main Results:

    • A novel 3D Cu(II) MOF, [Cu(OH)(C5H4NCO2).H2O], was successfully synthesized.
    • X-ray diffraction revealed a distorted square pyramidal geometry around Cu(II) centers and infinite copper oxide chains linked by p-pyridinecarboxylate ligands.
    • TGA indicated stability up to 245°C after removal of guest water molecules.
    • Magnetic studies showed 1D antiferromagnetic ordering with a Néel temperature of ~51 K, and a coupling constant (J) of -7.3 cm⁻¹.

    Conclusions:

    • The synthesized copper hydroxide p-pyridinecarboxylate hydrate is a stable 3D MOF with interesting 1D magnetic properties.
    • The framework structure facilitates the removal of guest water molecules, suggesting potential for host-guest chemistry.
    • The observed antiferromagnetic ordering provides insights into magnetic interactions in copper-based MOFs.