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Absorption spectra of dicyanomethylene squaraine dyes (1–5) in acetonitrile (ACN), acetone (ACT), dichloromethane (DCM), dimethylformamide (DMF), dimethyl sulfoxide (DMSO), 1,4-dioxane (DXN), ethanol (EtOH) and tetrahydrofuran (THF). The absorbance was normalized and is presented as arbitrary units (a.u.).
