UV–visible spectroscopic study of the hydrophilic and solvatochromic 4-[2,6-diphenyl-4-(pyridin-4-yl)pyridinium-1-yl]-2,6-bis(pyridin-3-yl)phenolate betaine dye in eight binary solvent mixtures

Autor: Herodes, Koit, Koppel, Juta, Reichardt, Christian, Koppel, Ilmar A.
Zdroj: Journal of Physical Organic Chemistry; September 2003, Vol. 16 Issue: 9 p626-632, 7p
Abstrakt: Solvent effects 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] in binary solvent mixtures of dimethyl sulfoxide and acetonitrile with water, methanol, propan-2-ol and 2-methylpropan-2-ol were studied by UV–visible 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 applicability of the ET(8) betaine dye for the determination of ET(30) values for aqueous media is discussed. Copyright © 2003 John Wiley & Sons, Ltd.
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