Caesium sesquioxide

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Caesium sesquioxide
Identifiers
3D model (
JSmol
)
  • InChI=1S/4Cs.2HO2.O2/c;;;;3*1-2/h;;;;2*1H;/q4*+1;;;-2/p-2
    Key: CBAPCGFDLAJQPQ-UHFFFAOYSA-L
  • [Cs+].[Cs+].[Cs+].[Cs+].[O-] [O].[O-] [O].[O-] [O-]
Properties
Cs4O6
Molar mass 627.616 g·mol−1
Appearance black powder[1]
Structure[1]
Pu2C3 structure type (
body-centered cubic
)
I43d (no. 220)
a = 984.6 pm
Related compounds
Other cations
 Rubidium sesquioxide
Related caesium oxides
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Caesium sesquioxide is a

anions O−2 and peroxide anions O2−2. Caesium in this compound has an oxidation state of +1, while oxygen in superoxide has an oxidation state of −1/2 and oxygen in peroxide has an oxidation state of −1. This compound has a structural formula of (Cs+)4(O−2)2(O2−2).[1][2] Compared to the other caesium oxides, this phase is less well studied,[3] but has been long present in the literature.[4] It can be created by thermal decomposition of caesium superoxide at 290 °C.[5]

4 CsO2 → Cs4O6 + O2

The compound is often studied as an example of a

half metal,[9] but along with the closely related rubidium sesquioxide, experimental results found a magnetically frustrated system.[1] Below about 200 K, the structure changes to tetragonal symmetry.[10] Electron paramagnetic resonance and nuclear magnetic resonance measurements show a complicated low temperature magnetic behavior that depends on the orientation of the oxygen dimers and superexchange through the caesium atoms.[11]

References

  1. ^
    S2CID 118706339
    .
  2. ^ "Chempendix - Oxidation States".
  3. ISSN 1520-6106
    .
  4. ISSN 0863-1786
    .
  5. ISSN 0044-2313
    .
  6. ^ Max Planck Society (2018-01-19). "Charge order and electron localization in a molecule-based solid". Phys.org. Retrieved 2021-11-26.
  7. PMID 29372183
    .
  8. PMID 31633914
    .
  9. S2CID 98543752
    .
  10. S2CID 210041198
    .
  11. ISSN 1098-0121
    .
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