Annealing C[sub 60][sup +]: Synthesis of fullerenes and large carbon rings

Journal Article · Fri May 07 04:00:00 EDT 1993 · Science (Washington, D.C.); (United States)

DOI:https://doi.org/10.1126/science.260.5109.784· OSTI ID:6201877

Hunter, J; Fye, J; Jarrold, M F ^[1]

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1. Northwestern Univ., Evanston, IL (United States)

Laser vaporization of graphite generates C[sub 60][sup +] cluster ions that are fullerenes and a mixture of roughly planar polycyclic polyyne ring isomers. Experimental studies of the annealing of the non-fullerene C[sub 60][sup +] ions indicate that they can be converted (in the gas phase) into the fullerene and an isomer that appears to be a large monocylic ring. Some fragmentation is associated with conversion to the fullerene geometry, but the majority of the non-fullerene C[sub 60][sup +] isomers are cleanly converted into an intact fullerene. The emergence of the monocyclic ring (as the clusters are annealed) suggests that this is a relatively stable nonspheroidal form of these all-carbon molecules. The estimated activation energies for the observed structural interconversions are relatively low, suggesting that these processes may play an important role in the synthesis of spheroidal fullerenes. 18 refs., 5 figs.

• OSTI ID: 6201877
• Journal Information: Science (Washington, D.C.); (United States), Journal Name: Science (Washington, D.C.); (United States) Vol. 260:5109; ISSN SCIEAS; ISSN 0036-8075
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACTIVATION ENERGY
ALKYNES
ANNEALING
CARBON
CHARGED PARTICLES
ELEMENTAL MINERALS
ELEMENTS
ENERGY
EVAPORATION
FULLERENES
GRAPHITE
HEAT TREATMENTS
HYDROCARBONS
IONS
MINERALS
NONMETALS
ORGANIC COMPOUNDS
PHASE TRANSFORMATIONS
RINGS
SYNTHESIS