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Solvent-dependent Raman study of ethyl acetate and N,N-dimethyl formamide in methanol and carbon tetrachloride

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Abstract

Raman spectra corresponding to C=O stretching mode of ethyl acetate (\(\hbox {C}_{{4}}\hbox {H}_{{8}}\hbox {O}_{{2}}\)) and N,N-dimethyl formamide (\(\hbox {C}_{3}\hbox {H}_{7}\hbox {NO}\)) in methanol (\(\hbox {CH}_{3}\hbox {OH}\)) and carbon tetrachloride (\(\hbox {CCl}_{{4}}\)) solvents were investigated in the region 1600–\(1800~\hbox {cm}^{{-1}}\). The variations of bandwidths corresponding to isotropic and anisotropic components of the C\(=\)O stretching mode with varying solvent concentration were discussed using different mechanisms. The variation in the vibrational and reorientational correlation times with concentration have been explained in terms of self-association, diffusion mechanism, formation of hydrogen bond and screening effect. The Onsager–Fröhlich dielectric model on anisotropy shift has been tested. This model holds good for the solute–\(\hbox {CH}_{3}\hbox {OH}\) system. However, the exponential curve for the solute–\(\hbox {CCl}_{{4}}\) system shows repulsive type of intermolecular forces playing a vital role in such complex system.

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Authors and Affiliations

  1. Department of Physics, North-Eastern Hill University, Shillong, 793 022, India

    Smriti Adhikari & S S Khatri

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  1. Smriti Adhikari
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  2. S S Khatri
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Correspondence to S S Khatri.

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Adhikari, S., Khatri, S.S. Solvent-dependent Raman study of ethyl acetate and N,N-dimethyl formamide in methanol and carbon tetrachloride. Pramana - J Phys 95, 133 (2021). https://doi.org/10.1007/s12043-021-02159-0

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  • DOI: https://doi.org/10.1007/s12043-021-02159-0

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