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Triplet fluoranthenes: Aromaticity versus unpaired electrons.
- Source :
-
Journal of Molecular Modeling . Apr2011, Vol. 17 Issue 4, p805-810. 6p. 2 Color Photographs, 2 Diagrams, 2 Charts. - Publication Year :
- 2011
-
Abstract
- Three fluoranthenes and one substituted fluoranthene, 2,2-dimethyl-2 H-dibenzo[ cd,k]fluoranthene, were investigated using the unrestricted symmetry-broken and complete active space methods. It was shown that four Kekuléan hydrocarbons are diradicals, implying that their ground state is a triplet. In the energetically less favorable singlet state these hydrocarbons exhibit pronounced diradical character. This occurance is explained with the tendency of the investigated molecules to delocalize their π-electrons. This leads to aromatic stabilization which is stronger than destabilization due to unpaired electrons. Our results for 2,2-dimethyl-2 H-dibenzo[ cd,k]fluoranthene are in excellent accord with experimental findings of McMaster et al. concerning this compound. [Figure not available: see fulltext.] [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 16102940
- Volume :
- 17
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- Journal of Molecular Modeling
- Publication Type :
- Academic Journal
- Accession number :
- 59984252
- Full Text :
- https://doi.org/10.1007/s00894-010-0778-5