Manganese (II) fluoride

Crystal structure
__ Mn 2+      __ F -
Crystal system	tetragonal
Space group	P 4 2 / mnm (No. 136)
General
Surname	Manganese (II) fluoride
other names	Manganese difluoride
Ratio formula	MnF 2
Brief description	pink solid
External identifiers / databases
CAS number 7782-64-1 EC number 231-960-0 ECHA InfoCard 100,029,054 PubChem 24528 Wikidata Q414680
properties
Molar mass	92.93 g mol −1
Physical state	firmly
density	3.98 g cm −3  (25 ° C)
Melting point	856 ° C
boiling point	1820 ° C
solubility	slightly soluble in water (10 g l −1 )
safety instructions
GHS labeling of hazardous substances Caution H and P phrases H: 302-312-315-319-332-335 P: 261-280-305 + 351 + 338
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

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

Extraction and presentation

Manganese (II) fluoride can be obtained by reacting manganese carbonate with hydrofluoric acid . It was received in this way by Jöns Jakob Berzelius as early as 1824 .

${\displaystyle \mathrm {MnCO_{3}+2\ HF\longrightarrow MnF_{2}+CO_{2}+H_{2}O} }$

It can also be displayed directly from the elements.

${\displaystyle \mathrm {Mn+F_{2}\longrightarrow MnF_{2}} }$

The tetrahydrate is formed by the slow evaporation of an aqueous solution of manganese (II) fluoride.

properties

Manganese fluoride

Manganese (II) fluoride forms 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 the rutile type with the space group P 4 ₂ / mnm (space group no. 136) and the lattice constants a = b = 487.3 pm and c = 313.0 pm. Its Néel temperature is 68 K. The compound forms fluorocomplexes M ¹ MnF ₃ with a perovskite structure and M ¹ MnF ₄ with alkali fluorides .

use

Manganese (II) fluoride can be used as a catalyst in pyridine syntheses .

Web links

• Main properties of MnF2 and CdF2 crystals

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. 268.
2. ↑ ^{a b} Z. Yamani, Z. Tun, DH Ryan: Neutron scattering study of the classical antiferromagnet MnF ₂ : a perfect hands-on neutron scattering teaching courseSpecial issue on Neutron Scattering in Canada. In: Canadian Journal of Physics. 88, 2010, pp. 771-797, doi : 10.1139 / P10-081 .
3. ↑ ^{a b c d e f} Data sheet Manganese (II) fluoride, 98% from Sigma-Aldrich , accessed on July 7, 2012 ( PDF ).
4. ↑ AMERICAN ELEMENTS: Manganese Fluoride
5. ^ ^{A b} Leopold Gmelin, Michael Dub, Patrick J. Lennon, Richard Joseph Meyer: Gmelin handbook of inorganic chemistry. Springer, 1977, p. 5 ( limited preview in the Google book search).
6. ↑ webelements: WebElements Periodic Table of the Elements | Manganese | chemical reaction data
7. ↑ GP Felcher, R. Adhesives: Anti Ferromagnetic domains and the spin-flop transition of MnF2 In: Europhys. Lett. 36, 455 (1996) doi : 10.1209 / epl / i1996-00251-7 .
8. ^ AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 1483.
9. ↑ S. Shimizu, N. Watanabe, T. Kataoka, T. Shoji, N. Abe, S. Morishita, H. Ichimura: Pyridine and Pyridine Derivatives. In: Ullmann's Encyclopedia of Industrial Chemistry . Wiley-VCH, Weinheim 2005.