Indium(III) iodide

Indium(III) iodide
Names
	Other names Indium triiodide
Identifiers
CAS Number	13510-35-5 ;
3D model (JSmol)	Interactive image;
ChemSpider	75371;
ECHA InfoCard	100.033.475
EC Number	236-839-6;
PubChem CID	83539;
UNII	3Y156GSM7E ;
CompTox Dashboard (EPA)	DTXSID5065516;
	InChI InChI=1S/3HI.In/h3*1H;/q;;;+3/p-3 Key: RMUKCGUDVKEQPL-UHFFFAOYSA-K;
	SMILES [In](I)(I)I;
Properties
Chemical formula	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

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

^ Handbuch der präparativen anorganischen Chemie. 1 (3., umgearb. Aufl ed.). Stuttgart: Enke. 1975. ISBN 978-3-432-02328-1.
^ 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.
^ 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.
^ Handbuch der präparativen anorganischen Chemie. 1 (3., umgearb. Aufl ed.). Stuttgart: Enke. 1975. ISBN 978-3-432-02328-1.
^ Downs, Anthony John (1993). Chemistry of aluminium, gallium, indium and thallium. London Glasgow New York [etc.]: Blackie. ISBN 978-0-7514-0103-5.
^ 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.
^ Taylor M. J., Kloo L. A. Journal of Raman Spectroscopy 31, 6, (2000), 465

[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.

[Brauer-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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