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Evaluation of medium effect on the absorption maxima of electronic spectra by Born functions of relative permittivity and refractive-index

V. Bekárek, Š. Bekárek, and F. Pavlát

Department of Analytical and Organic Chemistry, Faculty of Natural Sciences, Palacký University, CS-771 46 Olomouc


Abstract: Regression analysis of the by medium induced changes in the absorption band position of ten model compounds showed that the product of the Born's functions of relative permittivity (εr) and refractive index (n) in the form f(εr., n2) = (εr — 1)/εr • (n2—1)/n2 is more efficient for the evaluation of medium effect than recommended equations containing either Onsager's or Mossotti's functions of relative permittivity and refractive index. An excellent correlation (R = 0.984) was found between Kamlet—Taft's n* po­larity/polarizability parameters and the f(εr,n2) function with the set of 54 aprotic aliphatic solvents.

Full paper in Portable Document Format: 422a197.pdf


Chemical Papers 42 (2) 197–203 (1988)

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