Journal
JOURNAL OF MOLECULAR MODELING
Volume 6, Issue 2, Pages 226-233Publisher
SPRINGER VERLAG
DOI: 10.1007/s0089400060226
Keywords
strained rings; aromaticity; ab initio; AM1; MNDO; B3LYP
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The belt-like polyphenylenes, [0(n)]paracyclophanes, (n = 5 and 6), have been investigated using semi-empirical, ab initio and DFT methods. The molecular structure, rotational barrier on twisting a single phenyl ring and the aromatic character within each ring as well as in the whole molecule have been evaluated. [0(5)]Paracyclophane is predicted to have a quinonoid structure. In contrast, the equatorial pentaphenyl fragment found in C-70 as well as the hexagons of the less strained [0(6)]paracyclophane have benzenoid character. Approximate band structures have been derived for larger cycles of [0(n)] paracyclophanes.
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