Acta Crystallographica Section C

Crystal Structure Communications

Volume 61, Part 12 (December 2005)

inorganic compounds


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Acta Cryst. (2005). C61, i120-i124    [doi:10.1107/S0108270105036656]

K2M(H2P2O7)2·2H2O (M = Ni, Cu, Zn): orthorhombic forms and Raman spectra

R. Essehli, B. El Bali, A. Alaoui Tahiri, M. Lachkar, B. Manoun, M. Dusek and K. Fejfarova

Abstract: The crystal structures of three isotypic orthorhombic dihydrogendiphosphates, namely dipotassium copper(II)/nickel(II)/zinc(II) bis(dihydrogendiphosphate) dihydrate, K2M(H2P2O7)2·2H2O (M = Cu, Ni and Zn), have been refined from single-crystal data. The M2+ and K+ cations are located at sites of m symmetry, and the P atoms occupy general positions. These compounds also exist in triclinic forms with very similar structural features. The structures of both forms are compared, as well as the geometry of the MO6 octahedron, which is considerably elongated towards the water molecules for M = Ni and Cu. Such elongation has not been observed among the other representatives of the family. A Raman study of the whole series K2M(H2P2O7)2·2H2O (M = Mn, Co, Ni, Cu, Zn and Mg) is reported.

Formula: K2Cu(H2P2O7)2·2H2O, K2Ni(H2P2O7)2·2H2O and K2Zn(H2P2O7)2·2H2O

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Structure factor file (CIF format) (64.7 kbytes)
Contains datablock II

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Structure factor file (CIF format) (65.6 kbytes)
Contains datablock III

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