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Magnetic properties of MOF 525 and PCN 223 doped with copper (II) ions studied by EPR spectroscopy

The magnetic properties of metal-organic frameworks MOF-525 and PCN-223 doped with copper (II) ions were examined by continuous wave (CW) and pulse electron paramagantic resonance (EPR) spectroscopy. MOF-525 and PCN-223 have different topologies: MOF-525 cuboctahedron and PCN-223 hexagonal prism. [1] Fullerene was added to PCN- 223 to investigate if it could be incorporated into its structure and what impact it has on spintronic properties. Computer simulations of the experimental EPR data were obtained using EasySpin software. [2] From the simulations of the experimental data we can see that the CW-EPR spectra of MOF-525 and PCN-223 exhibit different hyperfine tensors, that superhyperfine lines are more pronounced if copper ions are more diluted and that fullerene is incorporated into the structure of PCN-223. Pulsed EPR data regarding coherence signal properties are being analyzed. [1] B.Karadeniz et al., J. Am. Chem. Soc. 2019, 141, 19214 19214–19220. [2] S. Stoll, A. Schweiger, J. Magn. Reson. 2006, 178, 42-55.

metal organic frameworks ; copper ; EPR spectroscopy

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