Manganese(II) chloride

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Manganese(II)_chloride_tetrahydrate
IUPAC name Manganese(II) chloride
General
Molecular formula	MnCl2
Molecular weight	125.84 amu (anhydrous) 197.91 amu (tetrahydrate)
Appearance	Pink solid (anhydrous) Rose-coloured crystalline solid (tetrahydrate)
CAS number	[7773-01-5] (anhydrous) [13446-34-9] (tetrahydrate)
MSDS	Manganese(II) chloride MSDS
Other names
Manganous chloride Manganese chloride Manganese dichloride
Bulk properties
Density	2.98 g/cm3 (anhydrous) 2.010 g/cm3 (tetrahydrate)
Solubility	water: 72.3 g/100 cm3 (25 °C) ethanol: soluble
Melting point	652 °C (925 K)
Boiling point	1190 °C (1460 K)
Hazards:	Toxic, irritant
Structure
Coordination geometry	Octahedral (6-coordinate)
Crystal structure	CdCl2
Hydrates	tetrahydrate
Related compounds
manganese(III) chloride- unstable at room temp. manganese(II) fluoride manganese(II) bromide manganese(II) iodide	chromium(II) chloride iron(II) chloride technetium(IV) chloride

Manganese(II) chloride (MnCl₂) is a pink salt of manganese and chlorine. It occurs naturally as the mineral scacchite. It is ionic and it dissolves in water to give a solution with a pH of around 4.

Contents

1 Chemical properties 2 Preparation 3 Uses 4 Precautions 5 Suppliers/Manufacturers 6 References

Chemical properties

Since manganese(II) chloride is soluble in water, it can be used to prepare a variety of manganese salts, e.g.,

MnCl₂(aq) + K₂CO₃(aq) → MnCO₃(s) + 2 KCl(aq)

It is a weak Lewis acid, reacting with chloride ion in ethanol to produce salts containing the [MnCl₄]^2- ion. It forms complexes with ligands such as triphenylphosphine (see "uses").

Preparation

Manganese(II) chloride may be prepared from manganese metal or manganese(II) carbonate reacting with hydrochloric acid. It is also produced when manganese(IV) oxide is heated with concentrated hydrochloric acid; this reaction was formerly used for the manufacture of chlorine.

MnO₂(s) + 4 HCl(aq) → MnCl₂(aq) + Cl₂(g) + 2 H₂O l)

Uses

In the laboratory, manganese(II) chloride serves as a starting point for the synthesis of a variety of manganese compounds. For example, manganocene may be prepared by reaction of MnCl₂ with cyclopentadienylsodium in THF. MnCl₂ reacts with ligands such as triphenylphosphine to produce metal complexes:

MnCl₂ + 2 Ph₃P → [MnCl₂(Ph₃P)₂]

Precautions

Suppliers/Manufacturers

• Strem (http://www.strem.com/code/index.ghc)
• Fisher (https://www1.fishersci.com/index.jsp)
• VWR (http://www.vwr.com/index.htm)
• Alfa (http://www.alfa.com/alf/index.htm)
• Aldrich (http://www.sigmaaldrich.com)

References

1. N. N. Greenwood, A. Earnshaw, Chemistry of the Elements, 2nd ed., Butterworth-Heinemann, Oxford, UK, 1997.
2. Handbook of Chemistry and Physics, 71st edition, CRC Press, Ann Arbor, Michigan, 1990.
3. A. F. Wells, 'Structural Inorganic Chemistry, 5th ed., Oxford University Press, Oxford, UK, 1984.
4. The Merck Index, 7th edition, Merck & Co, Rahway, New Jersey, USA, 1960.

Wikipedia (http://en.wikipedia.org/wiki/Main_Page) Manganese(II)_chloride (http://en.wikipedia.org/wiki/Manganese(II)_chloride) version history (http://en.wikipedia.org/w/index.php?title=Manganese(II)_chloride&action=history) GNU Free Documentation Lizenz (http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License) CC-by-sa (http://creativecommons.org/licenses/by-sa/2.5/)

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