In contrast to normal conjugated oligomers, the stilbenoid squaraines 3a–d do not show a convergence of VIS/NIR absorption due to the extension of conjugation; the observed bathochromic effect in the beginning of the series is followed by a hypsochromic effect; this result seems to be characteristic for stilbenoid compounds with donor–acceptor substitution.
H. Meier, R. Petermann and J. Gerold, Chem. Commun., 1999, 977 DOI: 10.1039/A900888H
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