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COPPER(I) CYANIDE

Basic information Uses Preparation Safety Related Supplier

COPPER(I) CYANIDE Basic information

Product Name:
COPPER(I) CYANIDE
CAS:
544-92-3
MF:
CCuN
MW:
89.56
EINECS:
208-883-6
Mol File:
544-92-3.mol
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COPPER(I) CYANIDE Chemical Properties

Melting point:
474 °C(lit.)
Boiling point:
decomposes [STR93]
Density 
2.92 g/mL at 25 °C(lit.)
storage temp. 
Poison room
form 
Powder
Specific Gravity
2.92
color 
White-beige to greenish
Water Solubility 
Practically insoluble in water and alcohol. Soluble in ammonium hydroxide, aqueous ammonia, pyridine and N-methylpyrrolidone.
Sensitive 
air sensitive
Merck 
14,2661
BRN 
3587244
Solubility Product Constant (Ksp)
pKsp: 19.46
Exposure limits
TLV-TWA 1 mg Cu/m3 (ACGIH).
Stability:
Stable. Incompatible with acids, bases, magnesium. Reacts violently with oxidizing agents, nitrates. Reaction with acid releases highly toxic gas (HCN).
CAS DataBase Reference
544-92-3(CAS DataBase Reference)
EPA Substance Registry System
Copper(I) cyanide (544-92-3)
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Safety Information

Hazard Codes 
T+,N,T
Risk Statements 
26/27/28-32-50/53
Safety Statements 
7-28-29-45-60-61-28A
RIDADR 
UN 1587 6.1/PG 2
WGK Germany 
2
RTECS 
GL7150000
10-23
TSCA 
Yes
HS Code 
2837 19 00
HazardClass 
6.1
PackingGroup 
II

MSDS

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COPPER(I) CYANIDE Usage And Synthesis

Uses

Copper(I) cyanide is used in copper plating of nickel, chromium, zinc alloys, steel, and other metals or alloys. Such copper plating imparts brightness, smoothness, hardness, and strength. The cyanide solution employed for copper electroplating consists of copper cyanide and sodium cyanide. Other applications of this compound are as an insecticide, a catalyst in polmerization, and as an antifouling agent in marine paints.

Preparation

Copper(I) cyanide is a precipitate obtained by adding potassium cyanide solution to an aqueous solution of Cu2+ salt:
COPPER(I) CYANIDE 2652CuCl2 + 4KCN → 2CuCN + C2N2 + 4KCl
The Cu2+ to CN¯ molar ratio should be 1:2. The precipitate dissolves in an excess of cyanide, forming soluble ions Cu(CN)2¯ , Cu(CN)32¯, and Cu(CN)43¯.

Description

off-white to green powder. Insoluble in water,soluble in HCI, Nl40H, and potassium cyanide. Used in Sandmeyer's reaction to synthesize aryl cyanides. Toxic by skin absorption, through open wounds, by ingestion, and by inhalation of hydrogen cyanide that arises from slight decomposition. Produces toxic oxides of nitrogen in fires.

Chemical Properties

Cuprous cyanide is a white crystalline substance.

Uses

In electroplating Cu or Fe; as insecticide, fungicide; as antifouling agent in marine paints; as polymerization catalyst.

Uses

Cuprous cyanide is used in electroplating; as an insecticide and fungicide; and as a catalyst for polymerization.

Reactivity Profile

COPPER(I) CYANIDE is decomposed by acids to give off hydrogen cyanide, a flammable poisonous gas. Tends to explosive instability. Capable of violent oxidation under certain condition: fusion with metal chlorates, perchlorates, nitrates or nitrites can cause explosions [Bretherick, 1979 p. 101]. Reacts with incandescence with magnesium [Mellor, 1940, Vol. 4, 271].

Hazard

Poison.

Health Hazard

Cuprous cyanide is a highly toxic substance. The toxic routes are inhalation of dust, ingestion, and skin contact. Toxicology and LD50 values for this compound are not reported. Because it is slightly soluble in water, its dissociation to cuprous and cyanide ions in the body may not be significant. The role of cyanide ion in the toxicity of cuprous cyanide is not established. The inhalation hazard, however, is attributable to copper. It is a skin irritant.

Health Hazard

Following severe exposure to dust, symptoms of cyanide poisoning may develop (see ingestion). Ingestion causes anxiety, confusion, dizziness, sudden loss of consciousness, odor of bitter almonds on breath or in vomitus, rapid weak pulse, convulsions, and paralysis. Contact with eyes causes irritation.

Fire Hazard

Special Hazards of Combustion Products: Toxic hydrogen cyanide gas may form in fires.

Safety Profile

A poison. Reacts violently with magnesium. When heated to decomposition it emits very toxic CNand NOx. See also CYANIDE and COPPER COMPOUNDS.

Potential Exposure

Copper cyanide is used in electroplating copper on iron; and as an insecticide and a catalyst.

Shipping

UN1587 Copper cyanide, Hazard Class: 6.1; Labels: 6.1-Poisonous materials

Purification Methods

Wash the cyanide thoroughly with boiling H2O, then with EtOH. Dry it at 100o to a fine soft powder. It dissolves in excess alkali cyanide solutions to form the very soluble complex ion Cu(CN)43-. [Bassett & Corbett J Chem Soc 125 1660 1924, Barber J Chem Soc 79 1943.]

Incompatibilities

Contact with heat, strong acids (HCl, H2SO4, HNO3) forms deadly hydrogen cyanide gas. May release hydrogen cyanide on contact with moisture. Incompatible with strong oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases, strong acids, oxoacids, epoxides, acetylene gas, and chemically active metals, such as potassium, sodium, magnesium, and zinc.

Waste Disposal

Copper-containing soluble wastes can be concentrated through the use of ion exchange, reverse osmosis, or evaporators to the point where copper can be electrolytically removed and sent to a reclaiming firm. If recovery is not feasible, the copper can be precipitated through the use of caustics and the sludge deposited in a chemical waste landfill. Copper-containing wastes can be concentrated to the point where copper can be electrolytically removed and reclaimed. If recovery is not feasible, the copper can be precipitated by alkali; the cyanide destroyed by alkaline oxidation yielding a sludge which can be sent to a chemical waste landfill. In accordance with 40CFR165, follow recommendations for the disposal of pesticides and pesticide containers. Must be disposed properly by following package label directions or by contacting your local or federal environmental control agency, or by contacting your regional EPA office.

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COPPER(I) CYANIDESupplierMore

Creasyn Finechem(Tianjin) Co., Ltd.
Tel:
022-83945878-
Email:
export@creasyn.com
J & K SCIENTIFIC LTD.
Tel:
010-82848833- ;010-82848833-
Email:
jkinfo@jkchemical.com;market6@jkchemical.com
Meryer (Shanghai) Chemical Technology Co., Ltd.
Tel:
21-61259100-
Email:
sh@meryer.com
3B Pharmachem (Wuhan) International Co.,Ltd.
Tel:
86-21-50328103 * 801、802、803、804 Mobile:18930552037
Email:
3bsc@sina.com
Alfa Aesar
Tel:
400-610-6006; 021-67582000
Email:
saleschina@alfa-asia.com
Basic information Uses Preparation Safety Related Supplier