Raman characterization of aqueous solutions of diols
S.O. Liubimovskii,1, V.S. Novikov,1
1 - Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov Str. 38, 119991 Moscow, Russia
Abstract
Aqueous solutions of ethylene glycol (EG, HO-CH2-CH2-OH) and 1,3-propylene glycol (1,3-PG, HO-CH2-CH2-CH2-OH) are widely used as antifreezes. The relative contents of the diol and water determine the structure and physicochemical properties of the solutions, including the freezing point.
Raman spectroscopy is an effective tool to evaluate the chemical composition and conformational order, and to characterize the intermolecular interactions of these polar molecules. The aims of this work were comparative Raman study of aqueous solutions of EG and 1,3-PG and the elaboration of Raman methods for their structural characterization.
The Raman spectra of EG, 1,3-PG and water contain the O-H stretching band, extended from 2800 to 3800 cm-1. Intensity of this band in the Raman spectra of aqueous solutions depends strongly on the diol content. We found out that the ratios of the intensities of the OH stretching band and the selected reference diol bands are the linear functions of the ratio of the contents of the solution components and, thus, can be used to evaluate the chemical compositions of these binary solutions.
This work was funded by the Russian Foundation for Basic Research (project No. 19-02-00931). We are grateful to the Joint Supercomputer Center of the RAS for the possibility of using their computational resources for our calculations.
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Speaker
Sergei Liubimovskii
GPI RAS
Russia
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