Fullerene Isomerism: Isolation of C 2 v ,-C 78 and D 3 -C 78
- 20 December 1991
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 254 (5039), 1768-1770
- https://doi.org/10.1126/science.254.5039.1768
Abstract
Early reports on the formation of the higher fullerenes C76, C78, C84, C90, and C94 by resistive heating of graphite stimulated theoretical calculations of possible cage structures for these all-carbon molecules. Among the five fullerene structures with isolated pentagons found for C78, a closed-shell D3h-isomer was predicted to form preferentially. Two distinct C78-isomers were formed in a ratio of ∼5:1 and could be separated by high-performance liquid chromatography. The carbon-13 nuclear magnetic resonance (NMR) spectrum of the major isomer is uniquely consistent with a C2v-structure. The NMR data also support a chiral D3-structure for the minor isomer. The isolation of specifically these two isomers of C78 provides insight into the stability of higher fullerene structures and into the mechanism for fullerene formation in general.Keywords
This publication has 21 references indexed in Scilit:
- The Separation and Identification of Higher Molecular Weight FullerenesPolycyclic Aromatic Compounds, 1992
- High-yield synthesis, separation, and mass-spectrometric characterization of fullerenes C60 to C266Journal of the American Chemical Society, 1991
- Solid-state magnetic resonance spectroscopy of fullerenesThe Journal of Physical Chemistry, 1991
- Faraday communications. Proposal of a chiral structure for the fullerene C76Journal of the Chemical Society, Faraday Transactions, 1991
- Faraday communications. The higher fullerences: a candidate for the structure of C78Journal of the Chemical Society, Faraday Transactions, 1991
- Organic chemistry of C60 (buckminsterfullerene): chromatography and osmylationThe Journal of Organic Chemistry, 1990
- Efficient production of C60 (buckminsterfullerene), C60H36, and the solvated buckide ionThe Journal of Physical Chemistry, 1990
- C60 has icosahedral symmetryJournal of the American Chemical Society, 1990
- Solid C60: a new form of carbonNature, 1990
- C60: BuckminsterfullereneNature, 1985