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

Rachid Essehli, Brahim El Bali, Aziz Alaoui Tahiri, Mohammed Lachkar, Bouchaib Manoun, Michal Dušek, Karla Fejfarova

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The crystal structures of three isotypic orthorhombic dihydrogendiphosphates, namely dipotassium copper(II)/nickel(II)/zinc(II) bis(dihydrogendiphosphate) dihydrate, K2M(H2P 2O7)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.

Original languageEnglish
JournalActa Crystallographica Section C: Crystal Structure Communications
Issue number12
Publication statusPublished - Dec 2005
Externally publishedYes


ASJC Scopus subject areas

  • Condensed Matter Physics
  • Structural Biology

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