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The electronic spectra of 1,1′-dianthrylpoly-ynes have been studied by Hückel MO theory on the basis on various approximations for resonance integrals. A good agreement between theoretical and experimental values is obtained from a modified bond-alternation approximation. This result shows that the contribution of a cumulene-type ionic structure to the ground state of the molecule increases with an increase in the number of the triple bonds.
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Nishimoto et al. (1966) studied this question.
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