542-84-7 Usage
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.
Check Digit Verification of cas no
The CAS Registry Mumber 542-84-7 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 5,4 and 2 respectively; the second part has 2 digits, 8 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 542-84:
(5*5)+(4*4)+(3*2)+(2*8)+(1*4)=67
67 % 10 = 7
So 542-84-7 is a valid CAS Registry Number.
InChI:InChI=1/2CN.Co/c2*1-2;/q2*-1;+2
