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Preparation, Crystal Structure, Vibrational Spectra, and Thermal Behavior of Rb2H2P2O6·2H2O

Authors

  • Mimoza Gjikaj,

    Corresponding author
    1. Institut für Anorganische und Analytische Chemie, TU Clausthal, Paul-Ernst-Strasse 4, 38678 Clausthal-Zellerfeld, Germany
    • Institut für Anorganische und Analytische Chemie, TU Clausthal, Paul-Ernst-Strasse 4, 38678 Clausthal-Zellerfeld, Germany, Fax: +49-5323-722995

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  • Peng Wu,

    1. Institut für Anorganische und Analytische Chemie, TU Clausthal, Paul-Ernst-Strasse 4, 38678 Clausthal-Zellerfeld, Germany
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  • Wolfgang Brockner

    1. Institut für Anorganische und Analytische Chemie, TU Clausthal, Paul-Ernst-Strasse 4, 38678 Clausthal-Zellerfeld, Germany
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  • Dedicated to Professor Dieter E. Kaufmann on the Occasion of His 65th Birthday

Abstract

Single crystals of Rb2H2P2O6·2H2O could be obtained from aqueous solutions of hypodiphosphoric acid and rubidium carbonate. Its crystal structure was determined by X-ray diffraction and it crystallizes in the monoclinic space group P21/c with Z = 4. The salt-like title compound consists of [H2P2O6]2– units in staggered P2O6-skeleton conformation, Rb+ cations, and H2O molecules, held together by intermolecular hydrogen bonds of the type O···O. The vibrational spectra (IR/FIR and Raman) of the rubidium salt were recorded and an assignment of the vibrational modes is proposed based on the point group C2h for the P2O6-skeleton of the anion. The thermal behavior of Rb2H2P2O6·2H2O is dominated by a complex TG decay indicating a simultaneous H2O delivery coupled with a disproportionation of [H2P2O6]2–, what is also supported by Raman spectra of heated samples.

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