Potassium, Cesium, and Ammonium Peroxogermanates with Inorganic Hexanuclear Peroxo Bridged Germanium Anion Isolated from Aqueous Solution

Alexander G. Medvedev, Alexey A. Mikhaylov, Andrei V. Churakov, Mikhail V. Vener, Tatiana A. Tripol'skaya, Shmuel Cohen, Ovadia Lev*, Petr V. Prikhodchenko

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Potassium (K6[Ge6(μ-OO)6(μ-O)6(OH)6]·14H2O, 1), cesium ammonium (Cs4.2(NH4)1.8[Ge6(μ-OO)6(μ-O)6(OH)6]·8H2O, 2), and potassium ammonium (K2.4(NH4)3.6[Ge6(μ-OO)6(μ-O)6(OH)6]·6H2O, 3) peroxogermanates were isolated from 3% hydrogen peroxide aqueous solutions of the corresponding hydroxogermanates and characterized by single crystal and powder X-ray diffraction studies and by Raman spectroscopy and thermal analysis. The crystal structure of all three compounds consists of cations of potassium and/or ammonium and cesium, water molecules, and centrosymmetric hexanuclear peroxogermanate anion [Ge6(μ-OO)6(μ-O)6(OH)6]6- with six μ-oxo- and six μ-peroxo groups. Peroxogermanates demonstrate relatively high thermal stability: the peroxide remains in the structure even after water release after heating to 100-120 C. DFT calculations of the peroxogermanate [Ge6(μ-OO)6(μ-O)6(OH)6]6- anion confirm its higher thermodynamic stability compared to the hydroperoxo- and oxogermanate analogues. (Chemical Equation Presented).

Original languageAmerican English
Pages (from-to)8058-8065
Number of pages8
JournalInorganic Chemistry
Volume54
Issue number16
DOIs
StatePublished - 17 Aug 2015

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© 2015 American Chemical Society.

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