Capturing nonclassical C70 with double heptagons in low-pressure combustion.

A double–heptagon–containing C70H6 (dihept-C70H6) was isolated and unambiguously characterized in the soot of low-pressure combustion, which shares the identical heptagonal cage as dihept-C70Cl6 previously identified in the products of carbon arc, and thus represents the first nonclassical fullerene isolable in both carbon arc and combustion. [ABSTRACT FROM AUTHOR]