Silver(I,III) oxide
![]() Ag(I) Ag(III) O | |
Names | |
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IUPAC name silver(I,III) Oxide | |
Other names tetrasilver tetroxide, silver peroxide, argentic oxide, silver suboxide, divasil | |
Identifiers | |
CAS Number |
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3D model (JSmol) |
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ECHA InfoCard | 100.013.726 ![]() |
EC Number |
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PubChem CID |
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UNII |
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InChI
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Properties | |
Chemical formula | Ag4O4 Ag2O.Ag2O3 |
Molar mass | 123.87 g/mol |
Appearance | grey-black powder diamagnetic |
Density | 7.48 g/cm3 |
Melting point | >100 °C, decomposition |
Solubility in water | .0027 g/100 mL |
Solubility | soluble in alkalis |
Hazards | |
GHS labelling: | |
Pictograms | ![]() ![]() ![]() |
Danger | |
Hazard statements | H272, H315, H319, H335 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). ![]() ![]() ![]() Infobox references |
Silver(I,III) oxide or tetrasilver tetroxide is the inorganic compound with the formula Ag4O4. It is a component of silver zinc batteries. It can be prepared by the slow addition of a silver(I) salt to a persulfate solution e.g. AgNO3 to a Na2S2O8 solution.[1] It adopts an unusual structure, being a mixed-valence compound.[2] It is a dark brown solid that decomposes with evolution of O2 in water. It dissolves in concentrated nitric acid to give brown solutions containing the Ag2+ ion.[3]
Structure
Although its empirical formula, AgO, suggests that the compound tetrasilver tetraoxide has silver in the +2 oxidation state, each unit has two monovalent silver atoms bonded to an oxygen atom, and two trivalent silver atoms bonded to three oxygen atoms, and it is in fact diamagnetic. X-ray diffraction studies show that the silver atoms adopt two different coordination environments, one having two collinear oxide neighbours and the other four coplanar oxide neighbours.[1] tetrasilver tetraoxide is therefore formulated as AgIAgIIIO2[4] or Ag2O·Ag2O3. It has previously been called silver peroxide, which is incorrect since it does not contain the peroxide ion, O22−.
Uses
Tetrasilver tetroxide has been marketed under a trade name "Tetrasil." In 2010, the FDA issued a warning letter to an American company concerning the firm's marketing of Tetrasil and Genisil ointments of tetrasilver tetroxide for herpes and similar conditions.[5]
References
- ^ a b Wells A.F. (1984) Structural Inorganic Chemistry 5th edition Oxford Science Publications ISBN 0-19-855370-6
- ^ David Tudela "Silver(II) Oxide or Silver(I,III) Oxide?" J. Chem. Educ., 2008, volume 85, p 863. doi:10.1021/ed085p863
- ^ Peter Fischer, Martin Jansen "Electrochemical Syntheses of Binary Silver Oxides" 1995, vol. 30, pp. 50–55. doi:10.1002/9780470132616.ch11
- ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8. p. 1181.
- ^ "FDA Warning Letter to Aidance Skincare and Topical Solutions, LLC | Quackwatch". 19 July 2010.
- v
- t
- e
- Ag4O4
- Al2O3
- AmO2
- Am2O3
- As2O3
- As2O5
- Au2O3
- B2O3
- BaO
- BeO
- Bi2O3
- BiO2
- Bi2O5
- BrO2
- Br2O3
- Br2O5
- Br
3O
8 - CO
- CO2
- C3O2
- CaO
- CaO2
- CdO
- CeO2
- Ce3O4
- Ce2O3
- ClO2
- Cl2O
- Cl2O2
- Cl2O3
- Cl2O4
- Cl2O6
- Cl2O7
- CoO
- Co2O3
- Co3O4
- CrO3
- Cr2O3
- Cr2O5
- Cr5O12
- CsO2
- Cs2O3
- CuO
- Dy2O3
- Er2O3
- Eu2O3
- FeO
- Fe2O3
- Fe3O4
- Ga2O
- Ga2O3
- GeO
- GeO2
- H2O
- 2H2O
- 3H2O
- H218O
- H2O2
- HfO2
- HgO
- Hg2O
- Ho2O3
- IO
- I2O4
- I2O5
- I2O6
- I4O9
- In2O3
- IrO2
- KO2
- K2O2
- La2O3
- Li2O
- Li2O2
- Lu2O3
- MgO
- Mg2O3
- MnO
- MnO2
- Mn2O3
- Mn2O7
- MoO2
- MoO3
- Mo2O3
- NO
- NO2
- N2O
- N2O3
- N2O4
- N2O5
- NaO2
- Na2O
- Na2O2
- NbO
- NbO2
- Nd2O3
- O2F
- OF
- OF2
- O2F2
- O3F2
- O4F2
- O5F2
- O6F2
- O2PtF6
- more...