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A 2023 study found that hosting ferrocene inside the cobalt-based metal–organic framework Co-MOF-74 changes the molecule’s structure and electronic state, allowing its iron centre to bind oxygen from air and oxidise from Fe(II) to Fe(III). The researchers also report that the oxygen binding can be reversed with temperature swings—but this is a laboratory finding, not a demonstrated oxygen-storage or medical technology.
What the researchers found
Ferrocene is an organometallic “sandwich” molecule: an iron atom sits between two cyclopentadienyl rings. In the reported experiment, researchers placed ferrocene inside Co-MOF-74, a cobalt-based metal–organic framework. The host environment altered ferrocene’s structure and magnetic and electronic properties, enabling oxygen to bind directly at the iron centre.
The authors describe a bent, stretched, high-spin Fe(II) state before oxygen binds. When oxygen from air attaches at the iron centre, the iron is oxidised from Fe(II) to Fe(III). This is not simply ordinary free ferrocene reacting with oxygen; the framework’s effect on the hosted molecule is central to the result. The American Chemical Society article record and abstract describe the structural and electronic change and oxygen binding.
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Why the framework changes ferrocene
Co-MOF-74 contains cobalt atoms arranged in chains. Chemistry World’s account of the study says ferrocene binds between these chains in an antiferromagnetic configuration, bending the molecule. That distortion weakens the ligand-field energy associated with the cyclopentadienyl rings and makes the high-spin state accessible. The authors’ publisher abstract independently supports the broader finding that the host changes ferrocene’s structure and electronic and magnetic properties. Chemistry World’s account provides the more detailed mechanism.
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What happens to the iron and oxygen
| Stage | Iron state | What the study reports |
|---|---|---|
| Ferrocene hosted in Co-MOF-74 | Bent, stretched high-spin Fe(II) | The framework alters ferrocene’s structure and properties, creating a state that can accept oxygen. |
| Oxygen binds | Fe(III) | Oxygen from air binds at the iron centre, oxidising iron from Fe(II) to Fe(III). |
| Temperature swing | Oxygen binding is reversed under the reported experimental conditions | The authors report reversible oxygen binding through temperature-swing experiments. |
The authors’ abstract says, “We also show that the binding of oxygen is reversible through temperature swing experiments.” The result establishes reversibility in their experiments; it does not by itself establish a practical storage process.
How the study was examined
The ACS record says the researchers combined several methods to analyse the material and its behaviour:
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- Mössbauer spectroscopy and extended X-ray absorption fine structure (EXAFS) to examine the iron’s state and local environment.
- In situ infrared spectroscopy to study changes while the material was being observed under experimental conditions.
- SQUID measurements to assess magnetic properties.
- Thermogravimetric analysis and energy-dispersive X-ray fluorescence spectroscopy for material characterization.
- Ab initio modelling to support interpretation of the system.
The ACS record also lists supporting information with further synthesis, experimental, computational and characterization details. See the publisher’s article record and supporting information.
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The work demonstrates a specific chemical response in ferrocene hosted by Co-MOF-74: oxygen binding at the iron centre, oxidation from Fe(II) to Fe(III), and reported reversibility through temperature swings. Chemistry World mentions oxygen storage and artificial blood as areas this research could inform, but these are prospective research directions, not applications demonstrated by the study.
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The sources do not establish an engineering-ready oxygen-storage system, medical use, operating capacity, efficiency or cycle life. They provide no quantitative performance figures that would support claims about how much oxygen the material stores or how well it performs over repeated cycles.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Study details
The paper, “Magnetically Induced Binary Ferrocene with Oxidized Iron,” was written by Saif Ullah, Stephanie Jensen, Yanyao Liu, Kui Tan, Hannah Drake, Guoyu Zhang, Junjie Huang, Jiří Klimeš, Darren M. Driscoll, Raphaël P. Hermann, Hong-Cai Zhou, Jing Li and Timo Thonhauser. It appeared in the Journal of the American Chemical Society, volume 145, issue 32, pages 18029–18035 (2023), DOI 10.1021/jacs.3c05754. It was published online August 2, 2023, and in the issue dated August 16, 2023. Ullah, Jensen, Liu and Tan are marked as equal contributors; Thonhauser is the corresponding author. The PubMed record provides bibliographic confirmation.
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