Copper (II) fluoride

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Structural formula
Structural formula of
General
Surname Copper (II) fluoride
other names

Copper difluoride

Molecular formula CuF 2
Brief description

White dust

External identifiers / databases
CAS number
  • 7789-19-7
  • 13454-88-1 (dihydrate)
PubChem 522688
Wikidata Q419686
properties
Molar mass 101.54 g mol −1
Physical state

firmly

density

4.23 g cm −3 (anhydrous)
2.934 g cm −3 (dihydrate)

Melting point

836 ° C

boiling point

1676 ° C

solubility

slightly soluble in cold water (47 g l −1 at 20 ° C)

safety instructions
GHS labeling of hazardous substances
05 - Corrosive

danger

H and P phrases H: 314
P: 280-305 + 351 + 338-310
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Copper (II) fluoride is a chemical compound from the group of fluorides .

Extraction and presentation

Copper (II) fluoride can be obtained by reacting copper (II) chloride with fluorine or copper (II) oxide with hydrogen fluoride at 400 ° C.

properties

Copper (II) fluoride

Copper (II) fluoride is a white, crystalline, air-sensitive powder that is sparingly soluble in cold water. It is hydrolytically split by hot water. If it is not completely anhydrous, it will turn a pale gray when heated. In the presence of water, a light blue dihydrate forms, which gives off its water of crystallization at temperatures above 130 ° C. The complex anions CuF 3 - , CuF 4 2− and CuF 6 4− are formed with fluoride ions . As a solid, copper (II) fluoride is in a distorted rutile structure . In the melt, it slowly decomposes to give copper (I) fluoride and copper , releasing fluorine .


use

Copper (II) fluoride can be used for the fluorination of aromatic hydrocarbons . However, this requires relatively high temperatures, which makes this reaction impossible for many products.

Synthesis of fluorobenzene

Similarly, copper (II) fluoride can also be used at high temperatures as a fluorinating agent for inorganic substances, for example for tantalum .

Individual evidence

  1. a b c d Georg Brauer (Ed.), With the collaboration of Marianne Baudler a . a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 246.
  2. a b c data sheet Copper (II) fluoride, 98% from Sigma-Aldrich , accessed on November 30, 2011 ( PDF ).
  3. a b c d David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. CRC Press, 2009, ISBN 978-1-4200-9084-0 .
  4. ^ A b c A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 .
  5. MA Subramanian, LE Manzer: A "Greener" Synthetic Route for Fluoroaromatics via Copper (II) Fluoride . In: Science . 297, No. 5587, 2002, p. 1665. doi : 10.1126 / science.1076397 . PMID 12215637 .