Abstract
The aim of this work was the synthesis of two new indolenin squaraines containing one or two malononitrile residues in a four-membered ring and the study of their spectral properties, molecular and crystalline structure. The geometry optimization of the substituted squaraines was carried out by the DFT/CAM-B3LYP method. Molecular and crystal structure of new dyes has been studied by X-ray method. It has been shown that these molecules exist in the di-cis conformation.
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