Germanium (II) oxide

General
Surname	Germanium (II) oxide
other names	Germanium monoxide
Molecular formula	GeO
Brief description	yellow solid
External identifiers / databases
CAS number 20619-16-3 EC number 243-922-0 ECHA InfoCard 100,039,914 PubChem 6327639 Wikidata Q4115313
properties
Molar mass	88.64 g mol −1
Physical state	firmly
density	1.825 g cm −3
Melting point	700 ° C (decomposition)
Refractive index	1.607
safety instructions
GHS hazard labeling no classification available
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . Refractive index: Na-D line , 20 ° C

Germanium (II) oxide is an inorganic chemical compound of germanium from the group of oxides .

Extraction and presentation

Germanium (II) oxide can be obtained by reacting germanium (IV) oxide with phosphinic acid or germanium.

${\displaystyle \mathrm {GeO_{2}+H_{3}PO_{2}\longrightarrow GeO+H_{3}PO_{3}} }$

${\displaystyle \mathrm {GeO_{2}+Ge\longrightarrow 2\ GeO} }$

properties

Germanium (II) oxide is a yellow solid that turns brown when boiled under water. Oxidation begins slowly at around 550 ° C in air. It usually contains a few percent germanium (IV) oxide and is easily oxidizable. The product obtained by reducing germanium (IV) oxide with germanium is crystalline and diamagnetic .

Individual evidence

1. ↑ ^{a b c d} Georg Brauer (Ed.), With the collaboration of Marianne Baudler a . a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 735.
2. ^ ^{A b} Jean d'Ans, Ellen Lax, Roger Blachnik: Pocket book for chemists and physicists . Springer DE, 1998, ISBN 3-642-58842-5 , pp. 474 .
3. ^ William M. Haynes: CRC Handbook of Chemistry and Physics, 93rd Edition . CRC Press, 2012, ISBN 1-4398-8049-2 , pp. 4–65 ( limited preview in Google Book Search).
4. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.