• The infrared spectra of tutton salts 1. A comparative study of (NH4)2 M″(SO4)2·6H2O (M″=Ni, Co or Mg)

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      https://www.ias.ac.in/article/fulltext/pram/014/06/0509-0521

    • Keywords

       

      Infrared spectra; tutton salts; optical phonons; libratory modes; metalaquo complex

    • Abstract

       

      The infrared spectra of (NH4)2M″(SO4)2.6H2O has been analysed in the region 4000–250 cm−1. The dynamics of each crystal has been discussed in terms of 234 phonon modes, including 3 acoustical ones, using the unit cell approximation. The ambiguity in the assignments of the bands in the region 900–500 cm−1 has been removed by assigning the bands in this region to the libratory modes of H2O molecules. It has been concluded that the NH4+ and SO42− ions have a symmetry lower thanTdand also the complex [M″(H2O)6]2+ has a symmetry lower than Oh. The hydrogen bonding is the strongest in the Ni-salt and the weakest in the Mg-salt.

    • Author Affiliations

       

      B Singh1 Shashi P Gupta1 B N Khanna1

      1. Department of Physics, Aligarh Muslim University, Aligarh - 202 001, India
    • Dates

       
  • Pramana – Journal of Physics | News

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