In:
Angewandte Chemie, Wiley, Vol. 131, No. 40 ( 2019-10), p. 14233-14237
Abstract:
All previously reported C 70 isomers have positive curvature and contain 12 pentagons in addition to hexagons. Herein, we report a new C 70 species with two negatively curved heptagon moieties and 14 pentagons. This unconventional heptafullerene[70] containing two symmetric heptagons, referred to as dihept‐C 70 , grows in the carbon arc by a theoretically supported pathway in which the carbon cluster of a previously reported C 66 species undergoes successive C 2 insertion via a known heptafullerene[68] intermediate with low energy barriers. As identified by X‐ray crystallography, the occurrence of heptagons facilitates a reduction in the angle of the π‐orbital axis vector in the fused pentagons to stabilize dihept‐C 70 . Chlorination at the intersection of a heptagon and two adjacent pentagons can greatly enlarge the HOMO–LUMO gap, which makes dihept‐C 70 Cl 6 isolable by chromatography. The synthesis of dihept‐C 70 Cl 6 offers precious clues with respect to the fullerene formation mechanism in the carbon‐clustering process.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.v131.40
DOI:
10.1002/ange.201902154
Language:
English
Publisher:
Wiley
Publication Date:
2019
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