Copper(I) cyanide

Copper(I) cyanide
Names
	IUPAC name Copper(I) cyanide
	Other names Cuprous cyanide, copper cyanide, cupricin
Identifiers
CAS Number	544-92-3 ;
3D model (JSmol)	Interactive image;
ChemSpider	10543 ;
ECHA InfoCard	100.008.076
EC Number	208-883-6;
PubChem CID	11009;
RTECS number	GL7150000;
UNII	534K22856J ;
UN number	1587
CompTox Dashboard (EPA)	DTXSID7023986 ;
	InChI InChI=1S/CN.Cu/c1-2;/q-1;+1 Key: DOBRDRYODQBAMW-UHFFFAOYSA-N ; InChI=1/CN.Cu/c1-2;/q-1;+1 Key: DOBRDRYODQBAMW-UHFFFAOYAI;
	SMILES [Cu+].[C-]#N;
Properties
Chemical formula	CuCN
Molar mass	89.563 g/mol
Appearance	off-white / pale yellow powder
Density	2.92 g/cm3
Melting point	474 °C (885 °F; 747 K)
Solubility in water	negligible
Solubility product (Ksp)	3.47×10−20
Solubility	insoluble in ethanol, cold dilute acids; ; soluble in NH3, KCN
Structure
Crystal structure	monoclinic
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H300, H310, H330, H410
Precautionary statements	P260, P262, P264, P270, P271, P273, P280, P284, P301+P310, P302+P350, P304+P340, P310, P320, P321, P322, P330, P361, P363, P391, P403+P233, P405, P501
NFPA 704 (fire diamond)	4 0 0
Flash point	Non-flammable
	NIOSH (US health exposure limits):
PEL (Permissible)	TWA 1 mg/m3 (as Cu)
REL (Recommended)	TWA 1 mg/m3 (as Cu)
IDLH (Immediate danger)	TWA 100 mg/m3 (as Cu)
Safety data sheet (SDS)	Oxford MSDS
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Copper(I) cyanide (cuprous cyanide) is an inorganic compound with the formula CuCN. This off-white solid occurs in two polymorphs; impure samples can be green due to the presence of Cu(II) impurities. The compound is useful as a catalyst, in electroplating copper, and as a reagent in the preparation of nitriles.