Ag(I) Ag(III) O
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Names | |
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IUPAC name
silver(I,III) Oxide
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Other names
tetrasilver tetroxide, silver peroxide, argentic oxide, silver suboxide, divasil
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Identifiers | |
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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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Properties | |
Ag4O4 Ag2O.Ag2O3 | |
Molar mass | 123.87 g/mol |
Appearance | grey-black powder diamagnetic |
Density | 7.48 g/cm3 |
Melting point | >100 °C, decomposition |
.0027 g/100 mL | |
Solubility | soluble in alkalis |
Hazards | |
GHS labelling: | |
Danger | |
H272, H315, H319, H335 | |
Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
|
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]
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−.
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]
Ag(I) Ag(III) O
| |
Names | |
---|---|
IUPAC name
silver(I,III) Oxide
| |
Other names
tetrasilver tetroxide, silver peroxide, argentic oxide, silver suboxide, divasil
| |
Identifiers | |
| |
3D model (
JSmol)
|
|
ECHA InfoCard | 100.013.726 |
EC Number |
|
PubChem
CID
|
|
UNII | |
| |
| |
Properties | |
Ag4O4 Ag2O.Ag2O3 | |
Molar mass | 123.87 g/mol |
Appearance | grey-black powder diamagnetic |
Density | 7.48 g/cm3 |
Melting point | >100 °C, decomposition |
.0027 g/100 mL | |
Solubility | soluble in alkalis |
Hazards | |
GHS labelling: | |
Danger | |
H272, H315, H319, H335 | |
Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
|
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]
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−.
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]