ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

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 (ε_r) and refractive index (n) in the form f(ε_r., n²) = (ε_r — 1)/ε_r • (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(ε_r,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)