Spectroscopic study of [Me(NH<sub>3</sub>)<sub>6</sub>]X<sub>2</sub> compounds. I‐Raman study of phase transitions in [Ni(NH<sub>3</sub>)<sub>6</sub>](ClO<sub>4</sub>)<sub>2</sub> and [Ni(ND<sub>3</sub>)<sub>6</sub>](ClO<sub>4</sub>)<sub>2</sub>
J.A. JanikInstitute of Chemistry of the Jagiellonian University, 30–060 Kraków, PolandT. SargaInstitute of Nuclear Physics, 31–342 Kraków, PolandJ.M. JanikInstitute of Chemistry of the Jagiellonian University, 30–060 Kraków, PolandG. PytaszInstitute of Chemistry of the Jagiellonian University, 30–060 Kraków, PolandJ. SokotowskiInstitute of Nuclear Physics, 31–342 Kraków, and Regional Laboratory of Physicochemical Analysis and Structural Research of the Jagiellonian University, 30—060 Kraków, Poland
1977en
ABI
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Abstract Temperature dependence of Raman spectra was measured for polycrystalline [Ni(NH 3 ) 6 ](ClO 4 ) 2 and [Ni(ND 3 ) 6 ](ClO 4 ) 2 . Spectroscopic evidence for the phase transition at 173 K was obtained. The phase transition is evident in the splitting of some bands corresponding to the internal ClO ion vibrations and in charactreistic intensity dependences of the bands. Some bands also showed a characteristic broadening with increasing temperature, which we interpret as being connected with stochastic reorientations of NH 3 groups and ClO ions. Two bands which were not resolved from the others at the room temperature study 1 were now evidenced at low temperatures.
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