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Kamlet–Taft's Solvatochromic Parameters for Nonaqueous Binary Mixtures between n-Hexane and 2-Propanol, Tetrahydrofurane, and Ethyl Acetate

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Abstract

The π*, α, and β Kamlet–Taft solvatochromic solvent parameters have been determined for nonaqueous binary mixtures commonly used in normal-phase liquid chromatography (NPLC), such as ethyl acetate n-hexane, tetrahydrofurane n-hexane, and 2-propanol n-hexane from spectroscopic data by using several UV-visible absorbing probes. Because preferential solvation is almost nonexistent for the π* probes in the different binary mixtures, we conclude that the measured values reflect quite well the dipolarity–polarizability of the bulk solution. However, strong preferential solvation for the different α and β probes in all mixtures studied here shows that the solvent parameters obtained reflect the properties of the solvation shell more than the bulk properties. This observation does not necessarily mean that the α and β values obtained will not be useful in multiple linear regressions (MLR), but results should be interpreted with care and will depend on the particular situation. Actually, results will make sense only if the particular solute under study preferentially solvates in a fashion similar to that of the α and β solvatochromic probes.

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Authors and Affiliations

  1. Departamento de Química y Física, Universidad Nacional de Río Cuarto, Agencia Postal No. 3, (5800), Río Cuarto, Argentina

    Mario Reta, Rosa Cattana & Juana J. Silber

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  1. Mario Reta
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  2. Rosa Cattana
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  3. Juana J. Silber
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Reta, M., Cattana, R. & Silber, J.J. Kamlet–Taft's Solvatochromic Parameters for Nonaqueous Binary Mixtures between n-Hexane and 2-Propanol, Tetrahydrofurane, and Ethyl Acetate. Journal of Solution Chemistry 30, 237–252 (2001). https://doi.org/10.1023/A:1005275432313

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