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Indium(III) iodide or indium triiodide is a chemical compound of indium and iodine with the formula InI3.

Preparation

Indium(III) iodide can be obtained by reacting indium with iodine vapor:[1]

2 In + 3I2 → 2 InI3

Indium(III) iodide can also be obtained by evaporation of a solution of indium in HI.[2]

Properties

Indium(III) iodide is a pale yellow, very hygroscopic monoclinic solid (space group P21/c (space group no. 14), a = 9.837 Å, b = 6.102 Å, c = 12.195 Å, β = 107.69°),[3] which melts at 210 °C to form a dark brown liquid and is highly soluble in water. Its crystals consist of dimeric molecules.[4] The yellow β form slowly converts to the red α form.[5] In the presence of water vapor, the compound reacts with oxygen at 245 °C to form indium(III) oxide iodide.[6]

Distinct yellow and red forms are known. The red form undergoes a transition to the yellow at 57 °C. The structure of the red form has not been determined by X-ray crystallography; however, spectroscopic evidence indicates that indium may be six coordinate.[7] The yellow form consists of In2I6 with 4 coordinate indium centres.

References

  1. ^ Handbuch der präparativen anorganischen Chemie. 1 (3., umgearb. Aufl ed.). Stuttgart: Enke. 1975. ISBN 978-3-432-02328-1.
  2. ^ E. Donges (1963). "Indium(III) Iodide". In G. Brauer (ed.). Handbook of Preparative Inorganic Chemistry, 2nd Ed. Vol. 1. NY, NY: Academic Press. pp. 861–2.
  3. ^ Forrester, J. D.; Zalkin, Allan; Templeton, David H. (Jan 1964). "Crystal and Molecular Structure of Indium(III) Iodide (In 2 I 6 )". Inorganic Chemistry. 3 (1): 63–67. doi:10.1021/ic50011a013. ISSN 0020-1669.
  4. ^ Handbuch der präparativen anorganischen Chemie. 1 (3., umgearb. Aufl ed.). Stuttgart: Enke. 1975. ISBN 978-3-432-02328-1.
  5. ^ Downs, Anthony John (1993). Chemistry of aluminium, gallium, indium and thallium. London Glasgow New York [etc.]: Blackie. ISBN 978-0-7514-0103-5.
  6. ^ Hagen, A. P. (2009-09-17). Inorganic Reactions and Methods, The Formation of Bonds to Group VIB (O, S, Se, Te, Po) Elements (Part 1). John Wiley & Sons. ISBN 978-0-470-14540-1.
  7. ^ Taylor M. J., Kloo L. A. Journal of Raman Spectroscopy 31, 6, (2000), 465


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