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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| Authors: | B Singh Shashi P Gupta B N Khanna |
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| Institution: | (1) Department of Physics, Aligarh Muslim University, 202 001 Aligarh, India |
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| 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 NH
4
+
and SO
4
2−
ions have a symmetry lower thanT
dand also the complex M″(H2O)6]2+ has a symmetry lower than O
h
. The hydrogen bonding is the strongest in the Ni-salt and the weakest in the Mg-salt. |
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| Keywords: | Infrared spectra tutton salts optical phonons libratory modes metalaquo complex |
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