In:
Angewandte Chemie International Edition, Wiley, Vol. 58, No. 40 ( 2019-10), p. 14095-14099
Kurzfassung:
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.
Materialart:
Online-Ressource
ISSN:
1433-7851
,
1521-3773
DOI:
10.1002/anie.201902154
Sprache:
Englisch
Verlag:
Wiley
Publikationsdatum:
2019
ZDB Id:
2011836-3
ZDB Id:
123227-7