Indium(III) iodide

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

Indium(III) iodide
Names
Other names
Indium triiodide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.475
EC Number
  • 236-839-6
UNII
  • InChI=1S/3HI.In/h3*1H;/q;;;+3/p-3
    Key: RMUKCGUDVKEQPL-UHFFFAOYSA-K
  • [In](I)(I)I
Properties
InI3
Molar mass 495.53 g/mol
Appearance Yellow solid
Density 4.69 g/cm3
Melting point 210 °C (410 °F; 483 K)
Boiling point 500 °C (932 °F; 773 K)
Related compounds
Other anions
 Indium(III) bromide
Indium(III) chloride
Other cations
 Aluminum iodide
Gallium(III) iodide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

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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