Caesium peroxide

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Caesium peroxide
Cs2O2.png
Names
IUPAC name
Caesium peroxide
Identifiers
3D model (JSmol)
ChemSpider
  • InChI=1S/2Cs.O2/c;;1-2/q2*+1;-2
    Key: HNZHVTZRIBKSIO-UHFFFAOYSA-N
  • [Cs+].[Cs+].[O-][O-]
Properties
Cs2O2
Molar mass 297.809 g·mol−1
AppearanceYellowish [1]
Structure
Orthorhombic [2]
Related compounds
Other cations
Related caesium oxides
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Caesium peroxide or cesium peroxide is an inorganic compound of caesium and oxygen with the chemical formula Cs 2 O 2. It can be formed from caesium metal by adding a stoichiometric amount in ammonia solution, or oxidizing the solid metal directly. [1]

2 Cs + O2 → Cs2O2

It can also be formed by the thermal decomposition of caesium superoxide: [3]

2 CsO2 → Cs2O2 + O2

Upon heating until 650 °C, the compound will decompose to caesium monoxide and atomic oxygen: [4]

Cs2O2 → Cs2O + [O]

Caesium peroxide shows a Raman vibration at 743 cm−1, due to the presence of the peroxide ions. [5] The compound is often used as a coating for photocathodes, due to its low work function. [6]

References

  1. 1 2 I. I. Volnov (2012). Peroxides, Superoxides, and Ozonides of Alkali and Alkaline Earth Metals. Springer. p. 45. ISBN   9781468482522.
  2. ↑ Band, A.; Albu-Yaron, A.; Livneh, T.; Cohen, H.; Feldman, Y.; Shimon, L.; Popovitz-Biro, R.; Lyahovitskaya, V.; Tenne, R. (2004-07-27). "Characterization of Oxides of Cesium". The Journal of Physical Chemistry B. 108 (33). American Chemical Society (ACS): 12360–12367. doi:10.1021/jp036432o. ISSN   1520-6106.
  3. ↑ Berardinelli, S. P.; Kraus, D. L. (1974-01-01). "Thermal decomposition of the higher oxides of cesium in the temperature range 320-500.deg". Inorganic Chemistry. 13 (1). American Chemical Society (ACS): 189–191. doi:10.1021/ic50131a037. ISSN   0020-1669.
  4. ↑ Zefirov, Nikolaj (1995). Chimičeskaja ėnciklopedija : v pjati tomach (in Bosnian). Moskva: Izdat. p. 658. ISBN   5-85270-092-4. OCLC   258155382.
  5. ↑ Livneh, Tsachi; Band, Alisa; Tenne, Reshef (2002). "Raman scattering from the peroxide ion in Cs2O2". Journal of Raman Spectroscopy. 33 (8). Wiley: 675–676. Bibcode:2002JRSp...33..675L. doi:10.1002/jrs.900. ISSN   0377-0486.
  6. ↑ Sun, Yun; Liu, Zhi; Pianetta, Piero; Lee, Dong-Ick (2007). "Formation of cesium peroxide and cesium superoxide on InP photocathodes activated by cesium and oxygen". Journal of Applied Physics. 102 (7). AIP Publishing: 074908–074908–6. Bibcode:2007JAP...102g4908S. doi: 10.1063/1.2786882 . ISSN   0021-8979.


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