Two new acidic diphosphates Rb2M(H2P2O7)2·2H2O (M = Zn and Mg): Crystal structures and vibrational study

Rachid Essehli, Brahim El Bali, Mohammed Lachkar, Giuseppe Cruciani

Research output: Contribution to journalArticle

4 Citations (Scopus)


Two new complex diphosphates Rb2M(H2P2O7)2·2H2O [M = Zn (I), Mg (II)], have been synthesized using wet chemistry. Their crystals have been isolated and characterized by X-ray diffraction, FTIR and micro-Raman techniques. Both compounds crystallize in the triclinic system, S.G. P-1, Z = 1 and following parameters (Å,°), [6.9573(1), 7.3615(1), 7.7938(1), 81.851(1), 70.622(1), 86.263(1), R1 / w R2 = 0.0315 / 0.1083 for (I) and 6.9546(1), 7.3752(1), 7.8117(1), 81.986(1), 70.275(1), 85.988(1), R1 / w R2 = 0.0275 / 0.0865 for (II)]. The crystal packing in (I) and (II) consists in a three-dimensional network made by layers, parallel to ac-plane. H2P2O72- shows bent eclipsed conformation and the M2+ ion lies on inversion centre. IR and Raman spectra confirm the bent geometry of the POP bridge angle.

Original languageEnglish
Pages (from-to)358-362
Number of pages5
JournalJournal of Alloys and Compounds
Issue number1-2
Publication statusPublished - 4 Mar 2010



  • Acidic diphosphates
  • Crystal structure
  • IR and micro-Raman spectroscopies
  • X-ray diffraction

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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