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Updated: Jan 14, 2026

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Published on: June 9, 2023
Histidine-Copper Site Variability in UiO-66: Monitoring Synthetic Intricacy with EPR Spectroscopy
Erlend Aunan1, Isabelle Gerz2, Karl P Lillerud1
1Centre for Materials Science and Nanotechnology, Department of Chemistry, University of Oslo, Sem Sælandsvei 26, N-0315 Oslo, Norway.
Researchers developed a tunable metal-organic framework catalyst inspired by nature. This bioinspired catalyst supports copper-histidine complexes, showing promise for efficient industrial chemical reactions like methane to methanol conversion.
Area of Science:
- Catalysis
- Materials Science
- Bioinorganic Chemistry
Background:
- Bioinspired catalyst design mimics natural enzymes for enhanced efficiency.
- Monooxygenases are key enzymes for selective substrate oxidation, e.g., methane to methanol.
- Metal-organic frameworks (MOFs) offer tunable platforms for catalyst development.
Purpose of the Study:
- To investigate copper-histidine complexes supported by zirconium-based UiO-66 MOFs with open zirconium sites.
- To explore the influence of histidine loading on copper speciation and retention within the MOF.
- To assess the potential for bioinspired catalyst design using MOF characterization.
Main Methods:
- Synthesis of UiO-66 MOF with open zirconium sites.
- Incorporation of copper-histidine complexes with varying histidine loadings.
- Electron Paramagnetic Resonance (EPR) spectroscopy for copper species identification and quantification.
Main Results:
- Three distinct copper species were identified within the UiO-66 framework.
- Copper retention was significantly improved by histidine loading.
- Copper speciation was tunable based on histidine concentration, with one species resembling the pMMO CuB site.
Conclusions:
- The developed MOF system demonstrates tunable copper speciation for potential catalytic applications.
- Bioinspired design principles can be effectively applied using advanced MOF characterization.
- This work provides a foundation for developing novel catalysts for industrially relevant reactions.
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