Transition Metal Complexes Containing Dihydrogen Hypodiphosphate in Eclipsed Conformation as Ligand: Preparation, Crystal Structure, Vibrational Spectra, and Thermal Behavior of K2[M(H2P2O6)2(H2O)2]·H2O (M = Co, Ni, Cu, and Zn)

Authors

  • Mimoza Gjikaj,

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    1. Institut für Anorganische und Analytische Chemie der TU Clausthal, Paul-Ernst-Strasse 4, 38678 Clausthal-Zellerfeld, Germany
    • Institut für Anorganische und Analytische Chemie der 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 der TU Clausthal, Paul-Ernst-Strasse 4, 38678 Clausthal-Zellerfeld, Germany
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  • Supporting Information for this article is available on the WWW under http://dx.doi.org/10.1002/zaac.201300305 or from the author.

Abstract

The transition metal dihydrogen hypodiphosphate hydrates K2[Co(H2P2O6)2(H2O)2]·H2O (1), K2[Ni(H2P2O6)2(H2O)2]·H2O (2), K2[Cu(H2P2O6)2(H2O)2]·H2O (3) and K2[Zn(H2P2O6)2(H2O)2]·H2O (4) were synthesized and characterized by single crystal structure determination. The compounds 14 crystallize isotypic in the monoclinic space group C2/m (no. 12) with two formula units in the unit cell. The crystal structure is built up by [H2P2O6]2– units in an eclipsed conformation, by the corresponding transition metal, potassium cations, and water molecules. The eclipsed conformation of the [H2P2O6]2– has not been previously observed in none of known hypodiphosphates(IV) analyzed via X-ray diffraction. However, its proposed based on spectroscopic methods. FT-IR/FIR and FT-Raman spectra of the crystalline salts were recorded and the thermal behavior of the compounds was investigated.

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