| Identification | Back Directory | [Name]
COBALT CYANIDE | [CAS]
542-84-7 | [Synonyms]
COBALT CYANIDE
cobaltdicyanide
Cobal(II)cyanide
COBALTOUS CYANIDE
COBALT (II) CYANIDE
Cobalt(II)dicyanide
cobaltous dicyanide
cobalt(2+) dicyanide
cobaltcyanide(co(cn)2) | [EINECS(EC#)]
208-830-7 | [Molecular Formula]
C2CoN2 | [MDL Number]
MFCD00049427 | [MOL File]
542-84-7.mol | [Molecular Weight]
110.97 |
| Hazard Information | Back Directory | [Physical properties]
The anhydrous form is a deep-blue powder; hygroscopic; density 1.872 g/cm3; melts at 280°C; insoluble in water. The dihydrate is pink to reddish brown powder or needles; insoluble in water and acids; soluble in sodium or potassium cyanide solutions, ammonium hydroxide, and hydrochloric acid. | [Uses]
The compound has limited commercial applications. It is used as a catalyst and in the preparation of cyanide complexes. | [Preparation]
The trihydrate salt is obtained as a reddish brown precipitate by adding potasium cyanide to a cobalt salt solution:
CoCl2 + KCN + 3H2O → Co(CN)2?3H2O + 2KCl
This on dehydration yields anhydrous Co(CN)2. The Co(CN)2?3H2O precipitate formed above redissolves when excess KCN is added, forming a red solution of potassium cobalt(II) cyanide, K4Co(CN)6. Stoichiomtric amount of KCN should, therefore, be used in the preparation of cobalt(II) cyanide. | [Hazard]
The compound is highly toxic by ingestion and possibly through other routes of exposure. |
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