Abstract
AbstractThe solvent influence on the recently synthesized hydrophilic and negatively solvatochromic 4‐[2,6‐diphenyl‐4‐(pyridin‐4‐yl)pyridinium‐1‐yl]‐2,6‐bis(pyridin‐3‐yl)phenolate betaine dye [ET(8) dye] dissolved in binary water–tetra‐n‐butylammonium bromide mixtures was studied by UV–Vis spectroscopy and compared with analogous measurements of the standard ET(30) betaine dye [2,6‐diphenyl‐4‐(2,4,6‐triphenylpyridinium‐1‐yl)phenolate]. A preferential solvation model was applied to the data obtained. The ET(8) betaine dye can be applied for the determination of ET(30) values for aqueous media. However, the nonlinear nature of the relationship has to be taken into account if accurate results are desired. Copyright © 2005 John Wiley & Sons, Ltd.
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