Carbon arc production of heptagon-containing fullerene[68]

Yuan-Zhi Tan, Rui-Ting Chen, Zhao-Jiang Liao, Jia Li, Feng Zhu, Xin Lu, Su-Yuan Xie (), Jun Li (), Rong-Bin Huang and Lan-Sun Zheng
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Yuan-Zhi Tan: College of Chemistry and Chemical Engineering, Xiamen University
Rui-Ting Chen: College of Chemistry and Chemical Engineering, Xiamen University
Zhao-Jiang Liao: College of Chemistry and Chemical Engineering, Xiamen University
Jia Li: College of Chemistry and Chemical Engineering, Xiamen University
Feng Zhu: College of Chemistry and Chemical Engineering, Xiamen University
Xin Lu: College of Chemistry and Chemical Engineering, Xiamen University
Su-Yuan Xie: College of Chemistry and Chemical Engineering, Xiamen University
Jun Li: College of Chemistry and Chemical Engineering, Xiamen University
Rong-Bin Huang: College of Chemistry and Chemical Engineering, Xiamen University
Lan-Sun Zheng: College of Chemistry and Chemical Engineering, Xiamen University

Nature Communications, 2011, vol. 2, issue 1, 1-6

Abstract: Abstract A carbon heptagon ring is a key unit responsible for structural defects in sp2-hybrized carbon allotropes including fullerenes, carbon nanotubes and graphenes, with consequential influences on their mechanical, electronic and magnetic properties. Previous evidence concerning the existence of heptagons in fullerenes has been obtained only in off-line halogenation experiments through top-down detachment of a C2 unit from a stable fullerene. Here we report a heptagon-incorporating fullerene C68, tentatively named as heptafullerene[68], which is captured as C68Cl6 from a carbon arc plasma in situ. The occurrence of heptagons in fullerenes is rationalized by heptagon-related strain relief and temperature-dependent stability. 13C-labelled experiments and mass/energy conservation equation simulations show that heptafullerene[68] grows together with other fullerenes in a bottom-up fashion in the arc zone. This work extends fullerene research into numerous topologically possible, heptagon-incorporating isomers and provides clues to an understanding of the heptagon-involved growth mechanism and heptagon-dependent properties of fullerenes.

Date: 2011
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DOI: 10.1038/ncomms1431

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