Osmium oxydiammine dihydroxide

Chemical compound From Wikipedia, the free encyclopedia

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]

Quick facts Names, Identifiers ...
Osmium oxydiammine dihydroxide
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
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).
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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

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