Intermolecular Hydrogen Bond in Acetic Acid Solutions. Raman Spectra and ab initio Calculations
American Journal of Physics and Applications
Volume 6, Issue 6, November 2018, Pages: 169-174
Received: Dec. 7, 2018; Accepted: Dec. 20, 2018; Published: Jan. 15, 2019
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Authors
Khakim Khushvaktov, Department of Physics, Samarkand State University, Samarkand, Uzbekistan
Abduvakhid Jumabaev, Department of Physics, Samarkand State University, Samarkand, Uzbekistan
Valeriy Pogorelov, Department of Physics, Kiev National University, Kiev, Ukraine
Ulugbek Tashkenbaev, Department of Physics, Samarkand State University, Samarkand, Uzbekistan
Akhmad Absanov, Department of Physics, Samarkand State University, Samarkand, Uzbekistan
Gayrat Sharifov, Department of Physics, Samarkand State University, Samarkand, Uzbekistan
Barno Amrullaeva, Department of Physics, Samarkand State University, Samarkand, Uzbekistan
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Abstract
C=O vibrational bands of various aggregated formations of pure acetic acid in the Raman spectra have different values of the depolarization ratio. Ab initio calculations using the Gaussian 98 W program in the Hartree-Fock approximation with the basic set of Gaussian functions RHF 6-31G++(d, p) show that this is how it should be. Thus, the formation of aggregates from molecules leads not only to a change in the dipole moment of the molecules, but also to a change in the bond polarizability tensor. Calculations according to this program showed that one of the hydrogen atoms of CH3 group of acetonitrile can participate in the intermolecular hydrogen bond. This can lead to the formation of closed acetonitrile-acetic acid dimers. However, a comparison of the calculated and experimental data shows that in the case of acid-acetonitrile molecules, the H-bond is formed in the direction of the elongation –О-Н…N of acetonitrile molecules. The activity of one of the hydrogen atoms of the CH3 group of acetonitrile leads to the formation of closed dimeric aggregates in pure acetonitrile with a shift of the СN band of acetonitrile towards lower frequencies. The low-frequency asymmetry of СN acetonitrile band in the Raman spectra is associated with the presence of such aggregates in liquid acetonitrile.
Keywords
Raman Spectra, Ab Initio Calculation, H-Bond, Aggregated Formations, Carboxylic Acids
To cite this article
Khakim Khushvaktov, Abduvakhid Jumabaev, Valeriy Pogorelov, Ulugbek Tashkenbaev, Akhmad Absanov, Gayrat Sharifov, Barno Amrullaeva, Intermolecular Hydrogen Bond in Acetic Acid Solutions. Raman Spectra and ab initio Calculations, American Journal of Physics and Applications. Vol. 6, No. 6, 2018, pp. 169-174. doi: 10.11648/j.ajpa.20180606.15
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Copyright © 2018 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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