Ce@C 82 is isolated by high-performance liquid chromatography (HPLC) and the cage symmetry is determined as C 2 v by measuring the 13 C NMR spectra of its anion. The 13 C NMR peaks of [Ce@C 82 ] - show temperature-dependent shifts ascribed to the f electron remaining on the Ce atom. Both Ce@C 82 and [Ce@C 82 ] - are silent in electron spin resonance spectroscopy (ESR) because of the highly anisotropic g matrix as well as of the fast relaxation process originating from the orbital angular momentum of the f electron. This is the complementary relationship to the observation of the paramagnetic shift in 13 C NMR. [Ce@C 82 ] - has lower stability in air than [La@C 82 ] - .
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Wakahara et al. (2004) studied this question.
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