Osmium oxydiammine dihydroxide

Last updated
Osmium oxydiammine dihydroxide
Osmium diammine hydroxide.jpg
Osmium oxydiammine dihydroxide stored in water.
Names
Other names
Osmium oxydiammine-dihydroxide, [1] : 704 Oxyosmiumamine hydroxide, [2] osmosyldiammine hydroxide, [2] ammonio-sesquioxide of osmium [3] : 415 
Identifiers
3D model (JSmol)
  • InChI=1S/2H3N.2H2O.O.Os/h2*1H3;2*1H2;;/q;;;;;+2/p-2
  • Key: XLQFMNGSMNDSFO-UHFFFAOYSA-L
  • N.N.O=[Os](O)O
Properties
[OsO(NH3)2](OH)2
Molar mass 274.31 g/mol
Appearancebrown 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).

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. [4] [2]

Contents

Synthesis

The compound was first produced by Berzelius by reducing osmium tetroxide with an excess of ammonia at 50°C. [3] [6] [5]

3OsO4 + 10NH3 → 3OsO(NH3)2(OH)2 + 2N2 + 3H2O [5]

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

  1. 1 2 3 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.
  2. 1 2 3 4 Comey, Arthur Messinger (1896). A Dictionary of Chemical Solubilities: Inorganic. Macmillan and Company. p. 279. Retrieved 16 June 2025.
  3. 1 2 3 4 Gmelin, Leopold (1852). Hand Book of Chemistry. Cavendish Society. p. 415. Retrieved 16 June 2025.
  4. 1 2 3 4 5 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.
  5. 1 2 3 4 5 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)
  6. ↑ 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.
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.