• Near infrared spectral studies on interactions of CH3 groups with halide ions

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      https://www.ias.ac.in/article/fulltext/jcsc/105/01/0071-0078

    • Keywords

       

      Anion-molecular interactions; overtone spectra; local modes; methyl iodide; acetonitrile; nitromethane; dimethyl sulphoxide

    • Abstract

       

      Near infrared (NIR) spectra in the CH3 stretching first-overtone region for methyl iodide, acetonitrile, nitromethane and dimethyl sulphoxide are discussed in terms of normal mode and local mode descriptions. NIR spectra in this region for solutions of several alkali metal halides and tetraalkyl ammonium halides in these solvents are also reported. It is found that the relative intensity of the cooperative excitation band with respect to the pure overtone excitation band reduces considerably on increase in the concentration of the electrolytes in solution. The results are discussed in terms of the formation of anion-molecular complexes as well as intermode coupling due to kinetic energy and anharmonicity effects.

    • Author Affiliations

       

      A F Jayaraj1 Surjit Singh1

      1. Department of Chemistry, Indian Institute of Technology, Madras - 600 036, India
    • Dates

       
  • Journal of Chemical Sciences | News

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