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    • Keywords


      Infrared and Raman spectra; normal modes; spectral changes; hydrogen bonding, inter-and intra-molecular; phase transition

    • Abstract


      The IR and Raman spectra of 2-methyl, 3-chloroaniline (2-M, 3-CA) and 2-methyl, 6-chloroaniline (2-M, 6-CA) have been recorded at room temperature in the region 3600-100 cm−1. A vibrational analysis has been made using additional frequencies obtained from IR studies at 223 and 123 K and also including the polarization measurement of the Raman lines. A comparative study of these two molecules together with the spectra of 2,3-dimethylaniline (2,3-DMA), investigated earlier, has been presented. The anomalous behaviour of certain normal modes at low temperatures indicates the presence of an intermolecular hydrogen bonding of the N-H…N type in 2-M, 3-CA and 2,3-DMA, whereas, in 2-M, 6-CA, an intramolecular hydrogen bonding of the type N-H…Cl has been detected owing to the presence of the highly electronegative Cl atom at the ortho position.

    • Author Affiliations


      A R Shukla1 2 C M Pathak1 N G Dongre3 B P Asthana1 Jacob Shamir1 4

      1. Laser and Spectroscopy Laboratory, Department of Physics, Banaras Hindu University, Varanasi - 221 005, India
      2. Department of Non-Conventional Energy Sources, Block No. 14, CGO Complex, New Delhi - 110 003, India
      3. Department of Physics, Harish Chandra Post-graduate College, Varanasi - 221 001, India
      4. Department of Inorganic and Analytical Chemistry, The Hebrew University of Jerusalem, Jerusalem, Israel
    • Dates

  • Journal of Chemical Sciences | News

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