Abstract：The UV-Vis spectroscopic characterization of Sudan Ⅰ, Sudan Ⅲ and Sudan Ⅳ in nonpolar solvent ligarine，polar solvent acetonitrile, and acetonitrile-water mixture was studied. The characteristic absorption peaks of sudan series were a little red shifted in polar solvent compared to that in nonpolar solvent. In acetonitrile-water mixture the red shift of characteristic absorption peaks of sudan Ⅰ and sudan Ⅲ is respectively 13 and 8 nm, but the characteristic absorption peaks of sudan Ⅳ are red shifted before blue shifted. The increased adsorption strength of Sudan Ⅰ, Sudan Ⅲ and Sudan Ⅳ is 34.5%, 11% and 2.5% respectively. For these, the important reason is that the destroyed intramolecular hydrogen bond in Sudan series enlarges the scope of the π delocalized bond in polar solvent.
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