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PreprintCC BYChemRxiv

Approaching the Two-Dimensional Limit of the S = 1/2 Kagome Magnet via Metal-Organic Framework Exfoliation

  • Elizabeth J. Evans1,2
  • Tristan N. Dolling1,2,3,4
  • Jem Pitcairn1,2,5,6
  • Dirk Backes7,8
  • Larissa S. I. Veiga7,8
  • Pascal Manuel9,10
  • Giovanni Costantini1,2,11
  • Lucy Clark1,2
11 affiliations
  1. 1School of Chemistry, Molecular Sciences Building
  2. 2University of Birmingham
  3. 3Inorganic Chemistry Laboratory, Department of Chemistry
  4. 4University of Oxford
  5. 5Advanced Manufacturing and Materials Centre
  6. 6University of Warwick
  7. 7Diamond Light Source
  8. 8Harwell Science and Innovation Campus
  9. 9ISIS Neutron and Muon Source
  10. 10Rutherford Appleton Laboratory
  11. 11School of Physics and Astronomy
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Abstract

Realising chemically programmable two-dimensional magnetic materials is a major challenge in the development of next-generation quantum technologies. Layered magnetic metal–organic frameworks (MOFs) provide an attractive platform because their reticular design enables systematic control over composition, topology, and magnetic interactions while offering the possibility of exfoliation into atomically thin nanosheets. Here, we investigate the layered S = 1/2 kagome MOF, Cu 3 (CO 3 ) 2 ( bipy ) 6 · 2 ClO 4 , whose bulk magnetic structure is most consistently described by ferromagnetic kagome layers that are ferromagnetically correlated to adjacent ones. We develop a micromechanical Scotch tape exfoliation strategy capable of producing few-layer nanosheets and combine synchrotron X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) to demonstrate that the Cu 2+ oxidation state and ferromagnetic behaviour are retained following exfoliation. By showing that magnetic functionality is preserved in the exfoliated kagome MOF nanosheets, this work establishes the promise of layered magnetic MOFs as tuneable platforms for low-dimensional quantum magnetism and provides an important experimental route toward realising the archetypal S = 1/2 kagome magnet in the two-dimensional limit.

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Cite

BibTeXRIS
BibTeX
@misc{evans2026approaching,
  title = {{Approaching the Two-Dimensional Limit of the S = 1/2 Kagome Magnet via Metal-Organic Framework Exfoliation}},
  author = {Elizabeth J. Evans and Tristan N. Dolling and Jem Pitcairn and Dirk Backes and Larissa S. I. Veiga and Pascal Manuel and Giovanni Costantini and Lucy Clark},
  howpublished = {ChemRxiv},
  year = {2026},
  month = oct,
  doi = {10.26434/chemrxiv.15010683/v1},
  url = {https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010683/v1},
  note = {CC BY},
}
RIS
TY  - UNPB
TI  - Approaching the Two-Dimensional Limit of the S = 1/2 Kagome Magnet via Metal-Organic Framework Exfoliation
AU  - Elizabeth J. Evans
AU  - Tristan N. Dolling
AU  - Jem Pitcairn
AU  - Dirk Backes
AU  - Larissa S. I. Veiga
AU  - Pascal Manuel
AU  - Giovanni Costantini
AU  - Lucy Clark
PY  - 2026
DA  - 2026/10/19
PB  - ChemRxiv
DO  - 10.26434/chemrxiv.15010683/v1
UR  - https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010683/v1
AB  - Realising chemically programmable two-dimensional magnetic materials is a major challenge in the development of next-generation quantum technologies. Layered magnetic metal–organic frameworks (MOFs) provide an attractive platform because their reticular design enables systematic control over composition, topology, and magnetic interactions while offering the possibility of exfoliation into atomically thin nanosheets. Here, we investigate the layered S = 1/2 kagome MOF, Cu 3 (CO 3 ) 2 ( bipy ) 6 · 2 ClO 4 , whose bulk magnetic structure is most consistently described by ferromagnetic kagome layers that are ferromagnetically correlated to adjacent ones. We develop a micromechanical Scotch tape exfoliation strategy capable of producing few-layer nanosheets and combine synchrotron X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) to demonstrate that the Cu 2+ oxidation state and ferromagnetic behaviour are retained following exfoliation. By showing that magnetic functionality is preserved in the exfoliated kagome MOF nanosheets, this work establishes the promise of layered magnetic MOFs as tuneable platforms for low-dimensional quantum magnetism and provides an important experimental route toward realising the archetypal S = 1/2 kagome magnet in the two-dimensional limit.
ER  -