 Short-lived precipitate of[OsO2(NH3)4]Cl2 | |
| Names | |
|---|---|
| IUPAC name TetraamminedioxoOsmium(VI)Chloride | |
| Other names Osmyl tetramminochloride Dioxoosmium(2+) chloride ammoniate (1:2:4) | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider | |
| ECHA InfoCard | 100.206.699 |
| EC Number |
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| |
| |
| Properties | |
| [OsO2(NH3)4]Cl2 | |
| Molar mass | 361.3 g/mol |
| Appearance | Yellow powder[1] |
| slightly soluble[2] | |
| Solubility | Insoluble in alcohol, HCl, and solutions of ammonium salts.[3] |
| Hazards | |
| GHS labelling: | |
 | |
| Warning | |
| H315,H319,H335 | |
| P261,P264,P264+P265,P271,P280,P302+P352,P304+P340,P305+P351+P338,P319,P321,P332+P317,P337+P317,P362+P364,P403+P233,P405,P501 | |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Osmyl tetra-ammine chloride (also known asosmyl tetramminochloride[3] andtetraamminedioxoosmium (VI) chloride[1]) is an inorganicchemical compound with the formula[OsO2(NH3)4]Cl2.[4]
Osmyl tetra-ammine chloride can be prepared by addingammonium chloride to a solution ofpotassium osmate.[4][3][5]
Osmyl tetra-ammmine chloride is prone to decomposition. In boiling water it disproportionates toosmium tetroxide and osmium oxydiammine chloride.[3] When calcined in hydrogen, it yields osmium metal sponge.[4][7]
Despite its low solubility in water, solutions of the tetra-ammine chloride react withpotassium ferrocyanide to produce a violet color.[3][4]
Osmyl tetra-ammine chloride was used to recover metallic osmium. However, this application was abandoned in favor ofammonium hexachloroosmate(IV) due to unsatisfactory yields.[7] Despite this, it is still readily available to purchase from some chemical suppliers.[1][8][9]
Other osmyl tetra-ammine salts are known, such as the sulfate, nitrate, and oxalate. Their syntheses and characteristics are similar to those of the chloride.[2][3][4][5]
Their parent base, osmyl tetra-ammine hydroxide, is unstable and known only in solution.[2][3][4]
