Semi-empirical, ab initio Hartrce-Fock, and density functional studies (including gradient corrections) on the structures and stabilities of C,O and C&H2 are reported. Two low-energy isomers are found for both compounds which are roughly comparable in energy. These are obtained by bridging across th
Theoretical studies of icosahedral C60 and some related species
β Scribed by A.J. Stone; D.J. Wales
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- English
- Weight
- 307 KB
- Volume
- 128
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
There are many stable Cc0 structures other than the icosahedral one proposed by Kroto, Heath, O'Brien, Curl and SmaIley. They are related to each other by transformations involving the movement of two atoms. These tmnsformations are thermally forbIdden in the Woodward-Hoffmann sense (though photochemically allowed) and the observed C60 mass peak is likely to arise from a mixture of isomers.
π SIMILAR VOLUMES
Semi-empirical UNDO methods predict that 2 of 23 structurally distinct C6& isomers and 4 of 143 C7uH2 isomers have particularly low heats of formation. These isomers represent either 1 ,t-addition across a 6: 6-ring fusion or 1,4-addition across a ii-ring, with both hydrogens externally bound. Fully
## Abstract The ^13^C chemical shifts and oneβbond carbonβhydrogen coupling constants have been obtained for some hydroxycoumarins and their corresponding acetoxy and methoxy derivatives. The changes in the oneβbond carbonβhydrogen coupling constants resulting from the conversion of a hydroxy group
The energetics of the loss of C2 units from Cw and C,a has been extensively studied experimentally, but no consensus has yet been reached as to the energy of C2 dissociation from these fullerenes. We have used the Hat-tree-Fock self-consistent field theory and a hybrid of Hartree-Fock and density fu