Acta Cryst. (2005). E61, i64-i66  [ doi:10.1107/S1600536805008640 ]

(NH₄)₂[Ni(H₂P₂O₇)₂(H₂O)₂]

R. Essehli, M. Lachkar, I. Svoboda, H. Fuess and B. El Bali

Abstract: Diammonium nickel(II) dihydrogendiphosphate(V) dihydrate is a member of the isotypic series (NH₄)₂T(H₂P₂O₇)₂·2H₂O (T = Mn, Co or Zn). Isolated almost-regular NiO₆ octahedra form a layered structure. The Raman spectrum shows bands characteristic of H₂P₂O₇ groups.

Online 25 March 2005

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