Abstract
Based on a combination of experimental and theoretical studies of the absorption spectra (UV and IR) of diazonium salts (dimethylaminophenyldiazonium borofluoride) in different types of solutions, we have shown that the broad absorption band has vibrational structure, where the position of the components is regularly shifted depending on the solvent polarity, while the optical density and the position of the band depend on the nature of the solvation shell in the mixed solvent water:ethanol. A thermodynamic description of experimental data on the effect of the solvation shell on the optical density of the diazonium salt allowed us to show that the quantitative composition of the solvation shell differs from the composition of the mixed solvent: when the ethanol content in the solvent is less than 20 vol.%, there are practically no ethanol molecules in the solvation shell; when the ethanol content is greater than 80 vol.%, water molecules are missing from the solvation shell.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 74, No. 4, pp. 427–432, July–August, 2007.
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Lopatkin, Y.M., Kondratenko, P.A. Effect of interaction between the diazonium cation and the solvent on its spectral properties. J Appl Spectrosc 74, 472–478 (2007). https://doi.org/10.1007/s10812-007-0076-x
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DOI: https://doi.org/10.1007/s10812-007-0076-x