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Manganese(II) iodide

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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 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
Ball-and-stick model of layer stacking in the crystal structure of manganese(II) iodide
Molecular structure of manganese(II) iodide tetrahydrate
Molecular structure of manganese(II) iodide tetrahydrate
Names
IUPAC name
Manganese(II) iodide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard100.029.274Edit this at Wikidata
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 mass308.747 g/mol
Appearancepink crystalline
Density5.01 g/cm3
Melting point701 °C (1,294 °F; 974 K) (anhydrous)
80 °C (tetrahydrate)
Boiling point1,033 °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)
Flash pointnon-flammable
Related compounds
Otheranions
Manganese(II) fluoride
Manganese(II) chloride
Manganese(II) bromide
Othercations
Iron(II) iodide
Cobalt(II) iodide
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)
Chemical compound

Manganese(II) iodide is thechemical compound composed ofmanganese andiodide with theformula MnI2(H2O)n. The tetrahydrate is a pink solid while the anhydrous derivative is beige.[2] Both forms featureoctahedral Mn centers. Unlike MnCl2(H2O)4 and MnBr2(H2O)4 which are cis, MnI2(H2O)4 is trans.[3]

Preparation

[edit]

Anhydrous MnI2 is prepared from the elements:[4]

Mn + I2 → MnI2

The tetrahydrate can be prepared by treatingmanganese(II) carbonate withhydriodic acid. The anhydrous form can be produced from it by dehydration in a vacuum.[2]

Properties

[edit]

Samples turn brown in air under the influence of light as a result of the oxidation of the iodide ion to iodine.[5] It has a trigonal crystal structure of thecadmium iodide type (polytype 2H)[6][7] with the space group P3m1 (space group no. 164). It dissolves in water and decomposes.[5] The tetrahydrate has a monoclinic crystal structure with the space group P21/c (No. 14).[3]

Applications

[edit]

It is often used in the lighting industry.[8]

References

[edit]
  1. ^"223646 Manganese(II) iodide 98%". Sigma-Aldrich. Retrieved2011-08-05.
  2. ^abHosseiny, Afshin; MacKie, Anthony G.; McAuliffe, Charles A.; Minten, Karl (1981). "The Coordination Chemistry of Manganese".Inorganica Chimica Acta.49:99–105.doi:10.1016/S0020-1693(00)90464-X.
  3. ^abMoore, J. E.; Abola, J. E.; Butera, R. A. (1985-09-15)."Structure of manganese(II) iodide tetrahydrate, MnI2·4H2O".Acta Crystallographica Section C: Crystal Structure Communications.41 (9):1284–1286.doi:10.1107/S0108270185007466.ISSN 0108-2701.
  4. ^Friour, G.; Cahiez, G.; Normant, J. F. (1984). "Organomanganous Reagents; IX. Preparation of Various Halogenated, Alkoxylated, Aryloxylated, and Arylsulfenylated Ketones from Correspondingly Functionalized Carboxylic Acid Chlorides or Anhydrides".Synthesis.1984:37–40.doi:10.1055/s-1984-30724.S2CID 94812612.
  5. ^abAns, Jan d'; Ans, Jan d' (1998).Elemente, anorganische Verbindungen und Materialien. Taschenbuch für Chemiker und Physiker / D'Ans (4., neubearb. u. rev. Aufl ed.). Ort nicht ermittelbar: Verlag nicht ermittelbar.ISBN 978-3-540-60035-0.
  6. ^Riedel, Erwin; Alsfasser, Ralf, eds. (2007).Moderne anorganische Chemie: mit CD-ROM (3. Aufl ed.). Berlin: de Gruyter.ISBN 978-3-11-019060-1.
  7. ^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.
  8. ^Cepanec, Ivica (2004).Synthesis of Biaryls. Elsevier. p. 104.ISBN 0-08-044412-1. Retrieved2008-06-18.
Manganese(−I)
Manganese(0)
Manganese(I)
Manganese(II)
Manganese(II,III)
Manganese(II,IV)
Manganese(III)
Manganese(IV)
Manganese(V)
Manganese(VI)
Manganese(VII)
Salts and covalent derivatives of theiodide ion
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