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Electron Spin Relaxation Times of Copper(II) Ions in MOF-525 and PCN-223 Measured by Pulsed EPR Spectroscopy

The spin-lattice (𝑇1) and phase-memory electron spin (𝑇𝑚) relaxation times of metal-organic frameworks (MOFs) MOF-525 and PCN-223 doped with 10% copper (II) ions were examined by pulse electron paramagnetic resonance (EPR) spectroscopy. Investigation of these MOFs was performed in order to determine their potential as molecular spin qubits. Both MOFs exhibit electron spin coherence detectable up to 80 K. MOF-525 shows longer relaxation times than PCN-223. Incorporation of fullerene into PCN-223 increases both spin-lattice and phase-memory electron spin relaxation times. It was observed that PCN-223 with a maximum filling of fullerene shows better performance in both relaxation times compared with the previously surpassing MOF-525.

metal-organic frameworks ; copper ; molecular spin qubits ; pulsed EPR spectroscopy

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