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Manganese(II) iodide is the chemical compound composed of manganese and iodide with the formula MnI2(H2O)n. The tetrahydrate is a pink solid while the anhydrous derivative is beige.[2] Both forms feature octahedral Mn centers. Unlike MnCl2(H2O)4 and MnBr2(H2O)4 which are cis, MnI2(H2O)4 is trans.[3]

Preparation

Anhydrous MnI2 is prepared from the elements:[4]

Mn + I2 → MnI2

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

Properties

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 the cadmium 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

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

References

  1. ^ "223646 Manganese(II) iodide 98%". Sigma-Aldrich. Retrieved 2011-08-05.
  2. ^ a b Hosseiny, 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. ^ a b Moore, 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. ^ a b Ans, 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. Elseveir. p. 104. ISBN 0-08-044412-1. Retrieved 2008-06-18.
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