Osmium oxydiammine dihydroxide
Osmium oxydiammine dihydroxide stored in water.
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3D model (JSmol)
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| Properties | |
| [OsO(NH3)2](OH)2 | |
| Molar mass | 274.31 g/mol |
| Appearance | brown powder[4]: 231 |
| Melting point | (decomposes)[3] |
| insoluble[2] | |
| Solubility | dissolves in acids |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
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Osmium oxydiammine dihydroxide is an inorganic chemical compound with the formula [OsO(NH3)2](OH)2.[4][5] It exists as a brown powder that is insoluble in water.[2][4]
Synthesis
The compound was first produced by Berzelius by reducing osmium tetroxide with an excess of ammonia at 50°C.[3][5][6]
- 3OsO4 + 10NH3 → 3OsO(NH3)2(OH)2 + 2N2 + 3H2O
It can also be produced by treating hexachloroosmates with ammonia.[4][5]
Properties
Osmium oxydiammine dihydroxide decomposes explosively when heated in air, releasing nitrogen gas.[3][1]
When heated to boiling in concentrated alkali hydroxide solutions, osmium oxydiammine dihydroxide releases ammonia and decomposes to osmium dioxide.[1][4] It dissolves in acids.[5]
References
- ^ a b c J.W. Mellor (May 1936). "Osmium". A comprehensive treatise on inorganic and theoretical chemistry, Volume 15. London: Longmans, Green and Co. pp. 704–720. Retrieved 16 June 2025.
- ^ a b c d Comey, Arthur Messinger (1896). A Dictionary of Chemical Solubilities: Inorganic. Macmillan and Company. p. 279. Retrieved 16 June 2025.
- ^ a b c d Gmelin, Leopold (1852). Hand Book of Chemistry. Cavendish Society. p. 415. Retrieved 16 June 2025.
- ^ a b c d e J. Newton Friend (1920). "Osmium and its compounds". A textbook of inorganic chemistry, vol.IX Part I Cobalt, Nickel, and The Elements of The Platinum Group (PDF). London: Charles Griffin and Company, Limited. pp. 216–231. Retrieved 17 June 2025.
- ^ a b c d Fremy, Edmund. (1900). "Osmium". Encyclopédie chimique.Tome III.- Métaux. 17e cahier : platine et métaux qui l'accompagnent. Paris : Dunod. pp. 112–114. Retrieved 21 October 2025.
{{cite book}}: CS1 maint: publisher location (link) - ^ Prakash Satya (2013). "Platinum Metals-IV:Osmium". Advanced Chemistry of Rare Elements, 5th Ed. India: S Chand and Company Limited. pp. 611–612. ISBN 978-81-219-4254-6. Retrieved 24 July 2025.