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Breaking the rule: The first isolated endohedral cluster fullerene of C70 (Sc3N@C70) exhibits a cage structure that does not obey the isolated pentagon rule. It contains three pairs of adjacent pentagons, which are coordinated to the three Sc atoms of the asymmetrical Sc3N cluster (see the DFT-optimized structure; red Sc, blue N).
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Yang et al. (2007) studied this question.
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