Copper Fluoride

Chemistry & Physical Properties

Copper(II) fluoride, formula CuF2, formula weight 101.54 g/mol. Anhydrous form is a white crystalline solid, monoclinic crystal structure. Density 4.23 g/cm3. Melting point 950°C with decomposition. Anhydrous form is hygroscopic. Solubility in water poor; soluble in dilute HF. Dihydrate (CuF2·2H2O) is a blue crystalline solid often supplied as the working form for wet-chemistry applications.

Standards & Specifications

Industrial grades conform to generic supplier specifications and ASTM C1191 for industrial fluorides. Catalysis grades target high-surface-area material with controlled iron impurity. Pharmacopeial grades not commonly specified.

Regulatory & Transport Profile

CAS 7789-19-7. UN 3288 — Class 6.1 (Toxic), PG III. GHS pictograms: GHS07 (harmful), GHS09 (environmental hazard). REACH registered (EC 232-148-1). TSCA listed. RoHS — copper compounds are not restricted. Hygroscopic anhydrous form requires sealed packaging.

Available Grades

Frequently Asked Questions

What is the difference between anhydrous and dihydrate?

Anhydrous CuF2 is the dry white crystalline solid (used in catalysis); dihydrate is the blue crystalline form with 2 water molecules per formula unit (preferred for wet-chemistry handling).

Is it the same as copper(I) fluoride?

No — copper(II) fluoride (CuF2, the standard commercial form) and copper(I) fluoride (CuF, much less stable) are different compounds with different properties.

How should it be stored?

Anhydrous form requires sealed moisture-barrier containers, ideally under argon for high-purity lots. Dihydrate stores in normal moisture-tight packaging at room temperature.

Can it be used as a fluorinating agent?

Yes — used in selective fluorination of organic substrates and in the conversion of metal oxides to fluorides at high temperature.

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Authoritative References & External Data Sources

For peer-reviewed property data, regulatory listings, and structure verification: