Solvatochromism in Binary Solvent Mixtures by Means of a Penta-tert-butyl Pyridinium N-Phenolate Betaine Dye

The solvatochromic behavior of a penta‐tert‐butyl prydinium N‐phenolate betaine dye was studied using UV‐visible spectrophotometry in several binary mixture solvents. The solvent polarity parameter, ET (1) (kcal. mol−1) was calculated from the position of the longest‐wavelength intramolecular charge...

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Bibliographic Details
Published in:Journal of the Chinese Chemical Society (Taipei) 2006-08, Vol.53 (4), p.759-765
Main Authors: Mehranpour, A. M., Hashemnia, S.
Format: Article
Language:English
Subjects:
Binary solvent mixtures
Penta-tert-butyl prydinium N-phenolate betaine dye
Solvatochromism
Solvent polarity
Synergism
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Summary:The solvatochromic behavior of a penta‐tert‐butyl prydinium N‐phenolate betaine dye was studied using UV‐visible spectrophotometry in several binary mixture solvents. The solvent polarity parameter, ET (1) (kcal. mol−1) was calculated from the position of the longest‐wavelength intramolecular charge transfer absorption band of this penta‐tert‐butyl betaine dye. For binary solvent mixtures, all plots of ET (1) versus the mole fraction of a more polar component are nonlinear owing to preferential solvation of the probe by one component of the binary solvent mixture. In the computation of ET (1) it was assumed that the two solvents mixed interact to form a common structure with an ET (1) value not always intermediate between those of the two solvents mixed. The results obtained are explained by the strong synergism observed for some of the binary mixtures with strong hydrogen bond donors (HBD) solvents such as alcohols.
ISSN:0009-4536
2192-6549
DOI:10.1002/jccs.200600101