Abstract
A series of new squaraine dyes was synthesized by the condensation of 1,2-dihydroxycyclobuten-3,4-dione with various p-substituted anilines. The spectroscopic properties of these compounds were studied in ten solvents exhibiting different polarity. The solvatochromism of 1,3-bis(p-substituted phenylamino)squaraines in selected solvents was studied by measurement of absorption and emission spectra, and analyzed using the empirical Kamlet-Taft solvent parameter set. New synthesized dyes absorb in the UV–Vis region with the maximum located at about 340–410 nm and display low fluorescence quantum yield about 1 × 10−3.
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