Copper(I) acetylide

Copper(I) acetylide
Names
	IUPAC name Dicuprous acetylide
	Other names Copper(I) acetylide; Copper carbide; Cuprous acetylide;
Identifiers
CAS Number	1117-94-8 ;
3D model (JSmol)	Interactive image;
ChemSpider	14318114 ;
PubChem CID	19021056;
	InChI InChI=1S/C2.2Cu/c1-2;;/q-2;2+1 Key: SQDLRJMJSRRYGA-UHFFFAOYSA-N ; InChI=1/C2.2Cu/c1-2;;/q-2;2+1 Key: SQDLRJMJSRRYGA-UHFFFAOYAK;
	SMILES [C-]#[C-].[Cu+].[Cu+];
Properties
Chemical formula	Cu2C2
Molar mass	151.114 g·mol−1
Appearance	red-brown powder
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	explosive
	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)
	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) acetylide, copper carbide or cuprous acetylide, is claimed to be a chemical compound with the formula Cu₂C₂. It is proposed to consists of Cu⁺ cations and acetylide anions ⁻C≡C⁻, with the triple bond between the two carbon atoms. Although never characterized by X-ray crystallography, the material has been claimed at least since 1856. One form is claimed to be a monohydrate with formula Cu₂C₂·H₂O. It is a reddish-brown explosive powder.