Russian Journal of General Chemistry

, Volume 89, Issue 2, pp 212–218 | Cite as

Isomeric Bisdicyanomethylene-Substituted 1,3- and 1,2-Pyrilo-4-squaraines: Synthesis, Molecular, and Crystal Structure

  • V. V. KurdyukovEmail author
  • Yu. G. Vlasenko


Isomeric biscyanomethylene-substituted 1,3- and 1,2-pyrilo-4-squaraines have been synthesized. The formation of a dye, derivative of 1,2-squarate, from the derivative of 1,3-squarate has been demonstrated for the first time. Electronic absorption spectra of the synthesized dyes have been studied. The molecular and crystal structure has been investigated by X-ray diffraction analysis. Both isomeric dyes exist in the cis-conformation.


1,2- and 1,3-squaraines malononitrile squaraine dyes pyrylo-4-squaraines 


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© Pleiades Publishing, Ltd. 2019

Authors and Affiliations

  1. 1.Institute of Organic Chemistry of the National Academy of Sciences of UkraineKievUkraine

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