Manganese(II) chloride

Manganese(II) chloride
	Anhydrous
	Tetrahydrate
Names
	IUPAC names Manganese(II) chloride; Manganese dichloride
	Other names Manganous chloride; hyperchloride of manganese
Identifiers
CAS Number	7773-01-5 ; 20603-88-7 (dihydrate) ; 13446-34-9 (tetrahydrate) ;
3D model (JSmol)	anhydrous: Interactive image; tetrahydrate: Interactive image;
ChEMBL	ChEMBL1200693 ;
ChemSpider	22888 ;
ECHA InfoCard	100.028.972
PubChem CID	24480;
RTECS number	OO9625000;
UNII	6YB4901Y90 ; QQE170PANO (tetrahydrate) ;
CompTox Dashboard (EPA)	DTXSID9040681 ;
	InChI InChI=1S/2ClH.Mn/h21H;/q;;+2/p-2 Key: GLFNIEUTAYBVOC-UHFFFAOYSA-L ; InChI=1S/2ClH.Mn/h21H;/q;;+2/p-2 Key: GLFNIEUTAYBVOC-NUQVWONBAP; Key: GLFNIEUTAYBVOC-UHFFFAOYSA-L;
	SMILES anhydrous: [Mn+2].[Cl-].[Cl-]; tetrahydrate: Cl[Mn-4]([OH2+])(Cl)([OH2+])([OH2+])[OH2+];
Properties
Chemical formula	MnCl2
Molar mass	125.844 g/mol (anhydrous); 161.874 g/mol (dihydrate); 197.91 g/mol (tetrahydrate)
Appearance	pink solid (tetrahydrate)
Density	2.977 g/cm3 (anhydrous) ; 2.27 g/cm3 (dihydrate) ; 2.01 g/cm3 (tetrahydrate)
Melting point	654 °C (1,209 °F; 927 K) (anhydrous) ; dihydrate dehydrates at 135 °C ; tetrahydrate dehydrates at 58 °C
Boiling point	1,225 °C (2,237 °F; 1,498 K)
Solubility in water	63.4 g/100 ml (0 °C) ; 73.9 g/100 ml (20 °C) ; 88.5 g/100 ml (40 °C) ; 123.8 g/100 ml (100 °C)
Solubility	slightly soluble in pyridine, soluble in ethanol ; insoluble in ether
Magnetic susceptibility (χ)	+14,350·10−6 cm3/mol
Structure
Crystal structure	CdCl2
Coordination geometry	octahedral
Hazards
NFPA 704 (fire diamond)	2 0 0
Flash point	Non-flammable
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	250-275 mg/kg (rat, oral); 1715 mg/kg (mouse, oral)
Related compounds
Other anions	Manganese(II) fluoride; Manganese(II) bromide; Manganese(II) iodide
Other cations	Manganese(III) chloride; Technetium(IV) chloride; Rhenium(III) chloride; Rhenium(IV) chloride; Rhenium(V) chloride; Rhenium(VI) chloride
Related compounds	Chromium(II) chloride; Iron(II) chloride
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Manganese(II) chloride is the dichloride salt of manganese, MnCl₂. This inorganic chemical exists in the anhydrous form, as well as the dihydrate (MnCl₂·2H₂O) and tetrahydrate (MnCl₂·4H₂O), with the tetrahydrate being the most common form. Like many Mn(II) species, these salts are pink, with the paleness of the color being characteristic of transition metal complexes with high spin d⁵ configurations.

Names
Anhydrous
Tetrahydrate
IUPAC names Manganese(II) chloride Manganese dichloride
Other names Manganous chloride hyperchloride of manganese
Identifiers
CAS Number	7773-01-5^Y 20603-88-7 (dihydrate)^N 13446-34-9 (tetrahydrate)^Y
3D model (JSmol)	anhydrous: Interactive image tetrahydrate: Interactive image
ChEMBL	ChEMBL1200693^N
ChemSpider	22888^Y
ECHA InfoCard	100.028.972
PubChem CID	24480
RTECS number	OO9625000
UNII	6YB4901Y90^Y QQE170PANO (tetrahydrate)^Y
CompTox Dashboard (EPA)	DTXSID9040681
InChI InChI=1S/2ClH.Mn/h21H;/q;;+2/p-2^Y Key: GLFNIEUTAYBVOC-UHFFFAOYSA-L^Y InChI=1S/2ClH.Mn/h21H;/q;;+2/p-2 Key: GLFNIEUTAYBVOC-NUQVWONBAP Key: GLFNIEUTAYBVOC-UHFFFAOYSA-L
SMILES anhydrous: [Mn+2].[Cl-].[Cl-] tetrahydrate: Cl[Mn-4]([OH2+])(Cl)([OH2+])([OH2+])[OH2+]
Properties
Chemical formula	MnCl₂
Molar mass	125.844 g/mol (anhydrous) 161.874 g/mol (dihydrate) 197.91 g/mol (tetrahydrate)
Appearance	pink solid (tetrahydrate)
Density	2.977 g/cm³ (anhydrous) 2.27 g/cm³ (dihydrate) 2.01 g/cm³ (tetrahydrate)
Melting point	654 °C (1,209 °F; 927 K) (anhydrous) dihydrate dehydrates at 135 °C tetrahydrate dehydrates at 58 °C
Boiling point	1,225 °C (2,237 °F; 1,498 K)
Solubility in water	63.4 g/100 ml (0 °C) 73.9 g/100 ml (20 °C) 88.5 g/100 ml (40 °C) 123.8 g/100 ml (100 °C)
Solubility	slightly soluble in pyridine, soluble in ethanol insoluble in ether
Magnetic susceptibility (χ)	+14,350·10⁻⁶ cm³/mol
Structure
Crystal structure	CdCl₂
Coordination geometry	octahedral
Hazards
NFPA 704 (fire diamond)	2 0 0
Flash point	Non-flammable
Lethal dose or concentration (LD, LC):
LD₅₀ (median dose)	250-275 mg/kg (rat, oral) 1715 mg/kg (mouse, oral)
Related compounds
Other anions	Manganese(II) fluoride Manganese(II) bromide Manganese(II) iodide
Other cations	Manganese(III) chloride Technetium(IV) chloride Rhenium(III) chloride Rhenium(IV) chloride Rhenium(V) chloride Rhenium(VI) chloride
Related compounds	Chromium(II) chloride Iron(II) chloride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is ^YN ?) Infobox references