Semiempirical MO calculations predict that dicyclopenta[a,g]-, dicyclopenta[a,h]-, dibenzo[a,g]-, dicyclohepta[a,g]-, and dicyclohepta[a,h]-s-indacene undergo no bond distortions, retaining the full molecular symmetry groups, whereas dibenzo[a,h]-s-indacene suffers a pseudo Jahn–Teller bond distortion from C2v to Cs.
M. Kataoka and A. Toyota, J. Chem. Res. (S), 1998, 278 DOI: 10.1039/A800144H
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