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In this work, the synthesis and the photophysical study of novel symmetrical and unsymmetrical squaraine dyes is described. These dyes were prepared by base-catalyzed condensation reaction between 3H-indolium or benzothiazolium salts with dicyanomethylene squarate, derived from squaric acid. The photophysical behavior of the dyes was investigated using UV–Vis absorption and steady-state fluorescence...
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