CHEMISTRY: C70 Ions in Chains

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Science  08 Jun 2001:
Vol. 292, Issue 5523, pp. 1801b
DOI: 10.1126/science.292.5523.1801b

Fullerenes such as C60 and C70 are easily reduced and can accept a large number of negative charges. Dimeric, oligomeric, and polymeric (C60n)x ions have been studied, but the nature of the bonds linking the C60 units is not known precisely because no structural study has yet resolved all of the carbon positions; few studies of (C70n)x ions have been reported.

Brumm et al. have synthesized a linear polymeric C702− species as a barium salt and have localized and refined all of the carbon atoms (and thus the bond lengths) of the fullerene cage. The C70 units form zigzagging chains that are connected by bonds between carbon atoms in the five-membered rings at the “ends” of the molecule (these are the rings through which the fivefold rotational axis runs). In a two-dimensional representation (Schlegel projection) of the C70 molecule, the central pentagon represents the C70 face closest to the reader, and the outermost pentagon represents the opposing face on the far side of molecule. The bond lengths indicate that the negative charges are not localized on specific carbon atoms. — JU

Acknowledgments

Angew. Chem. Int. Ed. 40, 2069 (2001).

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