Add time:08/08/2019         Source:sciencedirect.com

The spectrophotometrical behavior of pyridinium N-phenolate betaine dye used as a solvatochromic indicator of solvent polarity is studied in binary mixtures of tetra-n-butylammonium glycinate and tetra-n-butylammonium l-alaninate with molecular solvents such as acetonitrile, ethyl acetate, and 1-butanol. This study shows that the solvent/solvent interactions, which cause preferential solvation of the dye solute, should not be established for studied amino acid-based ionic liquids with conventional molecular solvent mixtures. After addition of mole fraction of the ionic liquid, the intramolecular charge-transfer absorption spectrum of the betaine dye shows a dual peak structure. Variation of UV–Vis spectra demonstrates the existence of a relationship with the type of the molecular solvent. Molecular dynamic simulations showed clearly different compositions in the solvation shells of betaine dye.

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