Purer than the driven snow. Ce2@C80 has been isolated with a purity of >99% by an efficient extraction procedure, followed by an HPLC separation. The X‐ray photoelectron spectrum of Ce2@C80 suggests that both Ce atoms inside the cage occur as Ce3+, in agreement with the results of a recent ab initio calculation.
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Ding et al. (1996) studied this question.
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