Note: Crystal Structure, Vibrational Spectrum and Thermal Behavior of the Ammonium Hexathiohypodiphosphate Dihydrate, (NH4)4P2S6 · 2H2O
2014
Gjikaj, Mimoza | Brockner, Wolfgang
Single crystals of (NH₄)₄P₂S₆ ・ 2H₂O could be obtained and the crystal structure determined (monoclinic, P2₁/c with a = 6.931(1), b = 12.730(2), c = 17.446(2) Å , β = 96.87(1)°, V = 1528.2(4) ų, Z = 4). The NH₄ ⁺, and [P₂S₆]⁴⁻ ions and the water molecules are involved in an extended hydrogenbonding network. The FT-Raman and FT-IR spectra have been recorded and the observed vibrational frequencies assigned to tetrahedral NH₄ ⁺ and [P₂S₆]⁴⁻ (D₃d) ions as well as to H₂O molecules. The thermogravimetric analysis has shown that (NH₄)₄P₂S₆ · 2H₂O starts to decompose at around 60 °C (up to 170 °C), but no distinct intermediates could be observed.
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