Isolation and properties of small-bandgap fullerenes

Article Abstract:

The wide-ranging molecular structures of fullerenes suggests that they may have many interesting properties. The characteristics of C60 and C70 fullerenes are well known, with large energy gaps between the lowest-unoccupied and the highest-occupied molecular orbitals. They are soluble in many solvents. A new study identifies a second class of fullerenes, represented by C74 and a single isomer of C80. These fullerenes have small energy gaps and readily form insoluble polymerized solids which can be converted to soluble ions for separation and purification.

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Higher fullerenes in the Allende meteorite

Article Abstract:

Higher fullerenes (C(sub100) to C(sub250)) were detected in carbon-arc-evaporated soot material. A similar solvent extraction procedure was applied to the acid residue of the carbonaceous chondrite from the Allende meteorite to seek higher fullerenes. C(sub60) and C(sub70) were found, along with stable clusters of C(sub100) to C(sub400). The presence of fullerenes and higher-carbon clusters in the Allende meteorite suggests their survival through space and processing in the interstellar medium, and arrival on planets such as Earth.

Meteorites

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