Copper(II) fluoride

Kupferdifluorid

• 7789-19-7
• 13454-88-1 (dihydrate )

White powder

Fixed

4.23 g · cm -3 ( anhydrous) 2.934 g · cm -3 ( dihydrate)

836 ° C

1676 ° C

Slightly soluble in cold water ( 47 g · l-1 at 20 ° C)

Risk

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

Production and representation

Copper (II ) fluoride (II) can be obtained oxide with hydrogen fluoride at 400 ° C by the reaction of copper ( II) chloride, fluoride, or copper.

Properties

Copper (II ) fluoride is a white, crystalline, air-sensitive powder is sparingly soluble in cold water. From hot water it is cleaved hydrolytically. Is not it completely anhydrous, it turns slightly gray when heated. In the presence of water, a light blue dihydrate, which emits at temperatures above 130 ° C, its water of crystallization forms again. With fluoride ion to form the complex anions CuF3, CuF42 - and - CuF64. As a solid is copper (II ) fluoride before in a distorted rutile structure. In the melt, it decomposes slowly to release fluoride to copper (I ) fluoride and copper.

Use

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

Similarly, copper (II ) fluoride are used at high temperatures as a fluorinating agent for inorganic materials, such as tantalum.