Abstract
The synthesis of polymethine dyes of the cyanine and merocyanine series derived from 3-methylthionaphtheno[2,3-b]pyridine, 3-methylthionaphtheno[3,2-b]-pyridine, 6-methylthieno[2,3-b]thieno[2,3-b]-pyridine, and 6-methylthieno[3,2-b]thieno[2,3-b]pyridine is described. The color of the dyes obtained is discussed. It has been shown that the replacement of vinylene groups by sulfur atoms in one of the two benzene rings of the hetero residue in 2-substituted 5,6-benzoquinolines in cyanine dyes leads to a bathochromic shift of the absorption maxima.
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For part VI, see [8].
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Zhiryakov, V.G., Abramenko, P.I. Polymethine dyes derived from heterocyclic bases containing condensed thiophene rings. Chem Heterocycl Compd 5, 366–371 (1969). https://doi.org/10.1007/BF00471146
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DOI: https://doi.org/10.1007/BF00471146