Manganese(II) iodide

Manganese(II) iodide is the chemical compound composed of manganese and iodide with the formula MnI2. The anhydrous compound adopts the cadmium iodide crystal structure.[2] The pink tetrahydrate is known. Unlike MnX2(H2O)4, which are cis for X = Cl, Br, the iodides are trans in MnI2(H2O)4.[3]

Manganese(II) iodide
Ball-and-stick model of part of a layer in the crystal structure of manganese(II) iodide
Ball-and-stick model of layer stacking in the crystal structure of manganese(II) iodide
Names
IUPAC name
Manganese(II) iodide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.029.274
EC Number
  • 232-201-6
UNII
  • InChI=1S/2HI.Mn/h2*1H;/q;;+2/p-2 ☒N
    Key: QWYFOIJABGVEFP-UHFFFAOYSA-L ☒N
  • InChI=1/2HI.Mn/h2*1H;/q;;+2/p-2
    Key: QWYFOIJABGVEFP-NUQVWONBAL
  • [Mn+2].[I-].[I-]
Properties
MnI2
Molar mass 308.747 g/mol
Appearance pink crystalline
Density 5.01 g/cm3
Melting point 701 °C (1,294 °F; 974 K) (anhydrous)
80 °C (tetrahydrate)
Boiling point 1,033 °C (1,891 °F; 1,306 K)
soluble
+14,400·10−6 cm3/mol
Structure
Rhombohedral, hP3, SpaceGroup = P-3m1, No. 164
octahedral
Hazards[1]
GHS labelling:
GHS08: Health hazard
Danger
H360
P201, P202, P281, P308+P313, P405, P501
NFPA 704 (fire diamond)
1
0
1
Flash point non-flammable
Related compounds
Other anions
 Manganese(II) fluoride
Manganese(II) chloride
Manganese(II) bromide
Other cations
 Iron(II) iodide
Cobalt(II) iodide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

It can be used as a pink pigment or as a source of the manganese ion or iodide ion. It is often used in the lighting industry.[4]

References
  1. "223646 Manganese(II) iodide 98%". Sigma-Aldrich. Retrieved 2011-08-05.
  2. Cable, J. W.; Wilkinson, M. K.; Wollan, E. O.; Koehler, W. C. (1962). "Neutron Diffraction Investigation of the Magnetic Order in MnI2". Phys. Rev. 125 (6): 1860–1864. doi:10.1103/PhysRev.125.1860.
  3. Moore, J. E.; Abola, J. E.; Butera, R. A. (1985). "Structure of Manganese(II) Iodide Tetrahydrate, MnI2.4H2O". Acta Crystallographica Section C Crystal Structure Communications. 41 (9): 1284–1286. doi:10.1107/S0108270185007466.
  4. Cepanec, Ivica (2004). Synthesis of Biaryls. Elseveir. p. 104. ISBN 0-08-044412-1. Retrieved 2008-06-18.
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