Cobalt(II) cyanide
Cobalt(II) cyanide is the inorganic compound with the formula Co(CN)2. It is coordination polymer that has attracted intermittent attention over many years in the area of inorganic synthesis and homogeneous catalysis.
| Names | |
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| IUPAC name
Cobalt(II) cyanide | |
| Other names
cobaltous cyanide | |
| Identifiers | |
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3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.008.028 |
PubChem CID |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| Co(CN)2 | |
| Molar mass | 110.968 g/mol (anhydrous) 147.00 g/mol (dihydrate) 165.02 g/mol (trihydrate) |
| Appearance | deep-blue powder hygroscopic (anhydrous) reddish-brown powder (dihydrate) |
| Density | 1.872 g/cm3 (anhydrous) |
| Melting point | 280 °C (536 °F; 553 K) (anhydrous) |
| insoluble[1] | |
| Solubility | dihydrate degraded with dissolution by NaCN, KCN, NH4OH, HCl |
| +3825·10−6 cm3/mol | |
| Related compounds | |
Other anions |
Cadmium chloride, Cadmium iodide |
Other cations |
Zinc cyanide, Calcium cyanide, Magnesium cyanide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
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| Infobox references | |
Uses
Cobalt(II) cyanide has been used as a precursor to cobalt carbonyl.[2]
Preparation
The trihydrate salt is obtained as a reddish-brown precipitate by adding potassium cyanide to a cobalt salt solution.:[3]
- CoCl2(H2O)6 + 2 KCN → Co(CN)2 + 2 KCl + 6 H2O
Hydrated Co(CN)2 dissolves in the presence of excess potassium cyanide, forming a red solution of K4Co(CN)6. This material further oxidizes to yellow K3Co(CN)6.
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References
- Lide, David R., ed. (2006). CRC Handbook of Chemistry and Physics (87th ed.). Boca Raton, FL: CRC Press. ISBN 0-8493-0487-3.
- Heinz W. Sternberg, Irving Wender, Milton Orchin Cobalt Tetracarbonyl Hydride: (Cobalt Hydrocarbonyl) Inorganic Syntheses, 1957, vol. V, p. 192. doi:10.1002/9780470132364.ch55
- John H. Bigelow, "Potassium Hexacyanocobaltate(III)" Inorganic Syntheses, 1946, Volume I1, p. 225.
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