Potassium osmiamate
From Wikipedia, the free encyclopedia
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| Names | |||
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| Other names
Potassium nitridoosmate potassium nitridotrioxoosmate | |||
| Identifiers | |||
3D model (JSmol) |
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| ChEBI | |||
| ChemSpider | |||
| ECHA InfoCard | 100.040.508 | ||
| EC Number |
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| 13067 | |||
PubChem CID |
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CompTox Dashboard (EPA) |
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| Properties | |||
| K[OsO3N] | |||
| Molar mass | 291.3 g/mol | ||
| Appearance | Yellow crystals | ||
| Density | 4.2 g/cm3[1] | ||
| Melting point | 187°C[2] | ||
| slightly soluble[3] | |||
| Hazards | |||
| GHS labelling: | |||
 [2] | |||
| H315, H319, H335[2] | |||
| P261, P305+P351+P338[2] | |||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Potassium osmiamate (also known as potassium nitridoosmate and potassium nitridotrioxoosmate) is an inorganic chemical compound with the formula K[OsO3N], containing osmium in the +8 oxidation state.
The osmiamate anion [OsO3N]⁻ is structurally isoelectronic with osmium tetroxide, in which one oxygen atom is replaced with a nitrogen atom. It is classified as a transition metal nitrido complex, featuring a terminal nitrido ligand.[1][4]
The potassium salt possesses a distorted tetrahedral structure, with infrared bands at 1023, 858, and 890 cm⁻¹.[5] It forms yellow tetragonal bipyramidal crystals, which are slightly soluble in cold water, but more soluble in hot water. It is also soluble in alcohol, but not in ether.[3][6] It is stable in strong alkali under heating, but when treated with hydrohalic acids such as HCl and HBr, it is reduced to pentahalonitridoosmates, such as K2[OsNCl5].[5][1]
Potassium osmiamate is sensitive to light, and upon prolonged exposure samples darken. When heated to above 180 °C, it decomposes explosively, and when heated above 200 °C in a vacuum, it decomposes with the release of nitrogen gas.[7][6][1]
