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Homoconjugated push–pull chromophores are obtained by [2+2] cycloaddition of 2,3-dichloro-5,6-dicyano-p-benzoquinone to anilino or ferrocene donor-substituted alkynes, and in one case a spiro compound (see picture: examples with corresponding electron adsorption spectra; C gray, Cl green, N blue, O red). Significant third-order optical nonlinearities could be measured for the first time for homoconjugated push–pull systems.
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Kato et al. (2010) studied this question.
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