Manganese(II) fluoride

Tetragonal

P42/mnm

Manganese difluoride

Pink solid

Fixed

3.98 g · cm -3 ( 25 ° C)

856 ° C

1820 ° C

Slightly soluble in water (10 g · l -1)

Attention

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Manganese (II ) fluoride is a chemical compound of manganese and one of the fluorides.

Production and representation

Manganese (II ) fluoride can be obtained by the reaction of manganese with hydrofluoric acid. It has already been obtained in 1824 by Jöns Jakob Berzelius in this way.

It can also be shown directly from the elements.

The tetrahydrate produced by slow evaporation of an aqueous solution of manganese (II ) fluoride.

Properties

Manganese (II ) fluoride is pink square prisms and is sparingly soluble in water, soluble in dilute hydrofluoric acid, and slightly soluble in concentrated hydrochloric acid and nitric acid. It is an antiferromagnet and has a tetragonal crystal structure of rutile type with space group P42/mnm and the lattice constants a = b = 487.3 pm and c = 313.0 pm. Its Néel temperature is 72-75 ° C. The compound forms with alkali metal fluorides fluoro M1MnF3 with perovskite structure and M1MnF4.

Use

Manganese (II ) fluoride can also be used as a catalyst in Pyridinsynthesen.