Solvatochromic dipolarity micro‐sensor behaviour in binary solvent systems of the (water + ionic liquid) type: application of preferential solvation model and linear solvation energy relationships |
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Authors: | Claudia G. Adam M. Virginia Bravo Pedro M. E. Mancini Graciela G. Fortunato |
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Affiliation: | Departamento de Química, área Química Orgánica, Facultad de Ingeniería Química, Universidad Nacional del Litoral, , (3000) Santa Fe, Argentina |
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Abstract: | The type of specific intermolecular and interionic interactions that are established when an ionic liquid is dissolved in water was here analysed. The study of the solvatochromic response of dipolarity micro‐sensors based on Reichardt ET(30) and Kamlet–Abboud–Taft solvent scales and the application of the solvent exchange model confirmed the formation of different intersolvent complexes in binary mixtures of (water + [C4mim] [BF4]/[Br]) type. These complexes provide H‐bond or electron pairs to the polar network, respectively. Moreover, for 4‐methoxybenzenesulfonyl chloride hydrolysis reaction in the (water + [C4mim] [BF4]) system, a higher inhibition (13 times) on the kobs values was observed. Multiple linear regression analysis that allows confirming the solvent effect upon the reactive system is due to the hydrogen‐bond donor properties of intersolvent complex formed. Then, the correlation between two different solvent‐dependent processes proved to be successful. Copyright © 2014 John Wiley & Sons, Ltd. |
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Keywords: | binary solvent mixtures empirical parameters ionic liquid linear solvation energy relationships microscopic properties solvatochromic probe |
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