Osmyl tetra-ammine chloride
 Short-lived precipitate of [OsO2(NH3)4]Cl2
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| Names | |
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| IUPAC name
TetraamminedioxoOsmium(VI)Chloride
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| Other names
Osmyl tetramminochloride
Dioxoosmium(2+) chloride ammoniate (1:2:4) | |
| Identifiers | |
3D model (JSmol)
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| ChemSpider | |
| ECHA InfoCard | 100.206.699 |
| EC Number |
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PubChem CID
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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: | |
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| 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 their standard state (at 25 °C [77 °F], 100 kPa).
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Osmyl tetra-ammine chloride (also known as osmyl tetramminochloride[3] and tetraamminedioxoosmium (VI) chloride[1]) is an inorganic chemical compound with the formula [OsO2(NH3)4]Cl2.[4]
Synthesis
[edit]Osmyl tetra-ammine chloride can be prepared by adding ammonium chloride to a solution of potassium osmate.[4][3][5]
- K2[OsO2(OH)4] + 4NH4Cl → [OsO2(NH3)4]Cl2 + 2KCl + 4H2O[6]
Properties
[edit]Osmyl tetra-ammmine chloride is prone to decomposition. In boiling water it disproportionates to osmium tetroxide and osmium diammine 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 with potassium ferrocyanide to produce a violet color.[3][4]
Uses
[edit]Osmyl tetra-ammine chloride was used to recover metallic osmium. However, this application was abandoned in favor of ammonium hexachloroosmate(IV) due to unsatisfactory yields.[7] Despite this, it is still readily available to purchase from some chemical suppliers.[1][8][9]
Related compounds
[edit]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]
References
[edit]- ^ a b c "Tetraamminedioxoosmium(VI) Chloride". American Elements. Retrieved 23 June 2025.
- ^ a b c Comey, Arthur Messinger (1896). A Dictionary of Chemical Solubilities: Inorganic. Macmillan and Company. p. 279. Retrieved 22 June 2025.
- ^ a b c d e f g J.W. Mellor (May 1936). "Osmium". A comprehensive treatise on inorganic and theoretical chemistry, Volume 15. London: Longmans, Green and Co. pp. 706–727. Retrieved 22 June 2025.
- ^ a b c d e f 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 22 June 2025.
- ^ a b Prakash Satya (2013). "Platinum Metals-IV:Osmium". Advanced Chemistry of Rare Elements, 5th Ed. India: S Chand and Company Limited. pp. 613–616. Retrieved 24 July 2025.
- ^ Griffith, William (1967). "Osmium". Chemistry of the Rarer Platinum Metals. Interscience Publishers. p. 82. Retrieved 25 July 2025.
- ^ a b Gilchrist, Raleigh (1931). "A method for the separation and gravimetric determination of osmium" (PDF). J Res Bur Stand. 6 (3): 421–448. doi:10.6028/jres.006.028. Retrieved 22 June 2025.
- ^ "Tetraamminedioxoosmium(VI) chloride". Stanford Advanced Materials. Retrieved 23 June 2025.
- ^ "Tetraamminedioxoosmium(VI) chloride". Colonial Metals Inc. Retrieved 23 June 2025.