We report here on the two‐step synthesis of fullerene dimer 3 from monomer 2. The structures were confirmed by MALDI mass spectrometry, UV/Vis, FTIR, 1H NMR, and 13C NMR spectroscopy. The magnetic properties of the analogous species of dimer 3, N@C140H24O12, were studied by continuous‐wave electron‐spin resonance (CW‐EPR), indicating that the functionalization introduces a permanent zero‐field splitting (ZFS) D = 8.6 MHz and E = 0.45 MHz. The same synthetic procedure could be used to produce a 14N–15N dimer enabling spin resonance experiments that could demonstrate entanglement between electron spins.
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Hörmann et al. (2010) studied this question.
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