Pramana

, Volume 14, Issue 6, pp 509–521 | Cite as

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

  • B Singh
  • Shashi P Gupta
  • B N Khanna
Spectroscopy

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.

Keywords

Infrared spectra tutton salts optical phonons libratory modes metalaquo complex 

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Copyright information

© Indian Academy of Sciences 1980

Authors and Affiliations

  • B Singh
    • 1
  • Shashi P Gupta
    • 1
  • B N Khanna
    • 1
  1. 1.Department of PhysicsAligarh Muslim UniversityAligarhIndia

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