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Diamagnetic Clusters of Paramagnetic Endometallofullerenes: A Solid-State MAS NMR Study

“…An alternative proposal was made by Solodovnikov et al These authors called attention to the similarity of the electronic absorption spectra of La@C 82 in DMF and HMPA, which were obtained in their own work, with the UV−vis spectra of the La@C 82 - anion, obtained in the work of Akasaka et al On the basis of this similarity, they suggested that the paramagnetic La@C 82 is reduced by the solvent into the diamagnetic anion, La@C 82 - 25a. At this point, it is worthy noting that our 13 C NMR spectra of La-EMF/HMPA (Figure ) are similar to the 13 C spectrum of La@C 82 - from the same paper of Akasaka et al…”

“…Moreover, paramagnetic EMF molecules can form the spin-transfer complexes in which the electron spin density is located partially on atoms of the matrix in which the EMF molecules are embedded . By the same reasoning, the finding of the EPR signals in the solutions of Ce@C 82 in DMF or pyridine do not prove that Ce@C 82 , which is EPR-silent at 77−300 K, is indeed reduced to Ce@C 82 - in these solvents 25b…”