Crystalline Ammonium Peroxogermanate as a Waste-Free, Fully Recyclable Versatile Precursor for Germanium Compounds

Dmitry A. Grishanov, Andrei V. Churakov, Alexander G. Medvedev, Alexey A. Mikhaylov, Ovadia Lev*, Petr V. Prikhodchenko

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


High, nearly 100%, yield synthesis of ammonium peroxogermanate (APG), (NH4)6[Ge6(μ-OO)6(μ-O)6(OH)6]·6H2O, is presented, and its crystal structure is determined by single crystal X-ray study. It comprises centrosymmetric hexanuclear peroxogermanate anions [Ge6(μ-OO)6(μ-O)6(OH)6]6- with six μ-oxo- and six μ-peroxo groups forming negatively charged layers. The space between these layers is filled by ammonium cations and water molecules, forming a highly stable structure due to hydrogen bonding. Highly soluble macroporous amorphous germanium oxide (HSGO) is then synthesized by mild treatment of APG. The compound forms highly oversaturated metastable germanium oxide solution with a solubility of 100 g/L, over 20 times higher than the solubility of amorphous germanium oxide. HSGO solution is a versatile reagent that can react with basic and acidic reagents to give a diverse range of salts including, e.g., germanium sulfide, germanium hydrophosphate, and potassium germanate. In the absence of acid or base, the aqueous HSGO solution yields hexagonal germanium oxide under ambient conditions.

Original languageAmerican English
Pages (from-to)1905-1911
Number of pages7
JournalInorganic Chemistry
Issue number3
StatePublished - 4 Feb 2019

Bibliographical note

Funding Information:
This study was supported by the Russian Science Foundation (grant 17-73-10482). The research was performed using the equipment of the JRC PMR IGIC RAS.

Publisher Copyright:
© 2019 American Chemical Society.


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