Osmium diammine hydroxide

Osmium diammine hydroxide
Osmium diammine hydroxide stored in water.
Names
Other names
Osmium oxydiammine-dihydroxide, [1]: 704 Oxyosmiumamine hydroxide,[2] osmosyldiammine hydroxide, [2] ammonio-sesquioxide of osmium [3]: 415 
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

Osmium diammine hydroxide (also known as osmium oxydiammine dihydroxide) is an inorganic chemical compound with the formula [OsO(NH3)2](OH)2.[4] : 231  It exists as a brown powder that is insoluble in water.[4][2]

Synthesis

Osmium diammine hydroxide can be produced by reducing osmium tetroxide with aqueous ammonia at 50°C.[3][5][4]: 231  It can also be produced by treating hexachloroosmates with ammonia. [4]: 216 

Properties

Osmium diammine hydroxide decomposes explosively when heated in air, releasing nitrogen gas.[3][1] : 704 

When heated to boiling in concentrated alkali hydroxide solutions, osmium diammine hydroxide releases ammonia and decomposes to osmium dioxide.[1]: 705 [4]: 231 

It dissolves in acids to produce corresponding salts, such as osmium diammine chloride, [OsO(NH3)2]Cl2.[1]: 720 [4]: 231 

  • A solution of osmium diammine chloride.

References

  1. ^ a b c d 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. ^ a b c d Comey, Arthur Messinger (1896). A Dictionary of Chemical Solubilities: Inorganic. Macmillan and Company. p. 279. Retrieved 16 June 2025.
  3. ^ a b c d Gmelin, Leopold (1852). Hand Book of Chemistry. Cavendish Society. p. 415. Retrieved 16 June 2025.
  4. ^ a b c d e f g 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. ^ Prakash Satya (2013). "Platinum Metals-IV:Osmium". Advanced Chemistry of Rare Elements, 5th Ed. India: S Chand and Company Limited. pp. 611–612.
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