Caesium peroxide

Caesium peroxide
Names
	IUPAC name Caesium peroxide
Identifiers
CAS Number	12053-70-2;
3D model (JSmol)	Interactive image;
ChemSpider	10737153;
	InChI InChI=1S/2Cs.O2/c;;1-2/q2*+1;-2 Key: HNZHVTZRIBKSIO-UHFFFAOYSA-N;
	SMILES [Cs+].[Cs+].[O-][O-];
Properties
Chemical formula	Cs2O2
Molar mass	297.809 g·mol−1
Appearance	Yellowish
Structure
Crystal structure	Orthorhombic
Related compounds
Other cations	Lithium peroxide; Sodium peroxide; Potassium peroxide; Rubidium peroxide;
Related caesium oxides	Caesium suboxide; Caesium monoxide; Caesium sesquioxide; Caesium superoxide; Caesium ozonide;
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Caesium peroxide or cesium peroxide is an inorganic compound of caesium and oxygen with the chemical formula Cs₂O₂. 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

^ ^a ^b I. I. Volnov (2012). Peroxides, Superoxides, and Ozonides of Alkali and Alkaline Earth Metals. Springer. p. 45. ISBN 9781468482522.
^ 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.
^ 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.
^ Zefirov, Nikolaj (1995). Chimičeskaja ėnciklopedija : v pjati tomach (in Bosnian). Moskva: Izdat. p. 658. ISBN 5-85270-092-4. OCLC 258155382.
^ 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.
^ 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.

External links

Combining what shouldn't be combined: Making Cesium superoxide

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[Volnov-1] 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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