Silver(I,III) oxide

Silver(I,III) oxide
IUPAC name

silver(I,III) oxide
Other names

silver peroxide, argentic oxide, silver suboxide, divasil
Identifiers
CAS number 1301-96-8 Y
Properties
Molecular formula AgO

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 alkalies
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Silver(I,III) oxide is the inorganic compound with the formula AgO. It is a component of silver oxide-zinc alkaline 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]

Structure

The empirical formula AgO might suggest that silver is in the +2 oxidation state, however, AgO is diamagnetic. X-ray diffraction studies show that silver atoms adopt two different coordination environments, one having two collinear oxide neighbours and the other four coplanar oxide neighbours.[1] AgO is therefore formulated as AgIAgIIIO2[3] or Ag2O·Ag2O3. It is also known as silver peroxide, although it does not have peroxide (O22−) anions.

References

  1. ^ a b Wells A.F. (1984) Structural Inorganic Chemistry 5th edition Oxford Science Publications ISBN 0-19-855370-6
  2. ^ David Tudela "Silver(II) Oxide or Silver(I,III) Oxide?" J. Chem. Educ., 2008, volume 85, p 863. doi: 10.1021/ed085p863
  3. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Oxford: Butterworth-Heinemann. ISBN 0080379419.  p. 1181.