Indium(III) iodide
{{chembox
| Name = Indium(III) iodide
| ImageFile = Indium(III)-iodide-3D-balls.png
| ImageName =
| OtherNames = Indium triiodide
|Section1={{Chembox Identifiers
| DTXSID = DTXSID5065516
| EC_number = 236-839-6
| CASNo = 13510-35-5
| CASNo_Ref = {{Cascite|correct|CAS}}
| UNII_Ref = {{fdacite|correct|FDA}}
| UNII = 3Y156GSM7E
| ChemSpiderID = 75371
| PubChem = 83539
| StdInChI = InChI=1S/3HI.In/h3*1H;/q;;;+3/p-3
| StdInChIKey = RMUKCGUDVKEQPL-UHFFFAOYSA-K
| SMILES = [In](I)(I)I
}}
|Section2={{Chembox Properties
| Formula = InI3
| MolarMass = 495.53 g/mol
| Appearance = Yellow solid
| Density = 4.69 g/cm3
| Solubility =
| SolubleOther =
| Solvent =
| MeltingPtC = 210
| MeltingPt_notes =
| BoilingPtC = 500
| BoilingPt_notes =
}}
|Section3={{Chembox Structure
| Coordination =
| CrystalStruct =
| SpaceGroup =
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|Section7={{Chembox Hazards
| ExternalSDS =
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|Section8={{Chembox Related
| OtherAnions = Indium(III) bromide
Indium(III) chloride
| OtherCations = Aluminum iodide
Gallium(III) iodide
}}
}}
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:{{Cite book |title=Handbuch der präparativen anorganischen Chemie. 1 |date=1975 |publisher=Enke |isbn=978-3-432-02328-1 |edition=3., umgearb. Aufl |location=Stuttgart}}
:{{chem2|2 In + 3I2 -> 2 InI3}}
Indium(III) iodide can also be obtained by evaporation of a solution of indium in HI.{{cite book|author=E. Donges|chapter=Indium(III) Iodide|title=Handbook of Preparative Inorganic Chemistry, 2nd Ed. |editor=G. Brauer|publisher=Academic Press|year=1963|place=NY, NY|volume=1|pages=861–2}}
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°),{{Cite journal |last1=Forrester |first1=J. D. |last2=Zalkin |first2=Allan |last3=Templeton |first3=David H. |date=Jan 1964 |title=Crystal and Molecular Structure of Indium(III) Iodide (In 2 I 6 ) |url=https://pubs.acs.org/doi/abs/10.1021/ic50011a013 |journal=Inorganic Chemistry |language=en |volume=3 |issue=1 |pages=63–67 |doi=10.1021/ic50011a013 |issn=0020-1669}} which melts at 210 °C to form a dark brown liquid and is highly soluble in water. Its crystals consist of dimeric molecules.{{Cite book |title=Handbuch der präparativen anorganischen Chemie. 1 |date=1975 |publisher=Enke |isbn=978-3-432-02328-1 |edition=3., umgearb. Aufl |location=Stuttgart}} The yellow β form slowly converts to the red α form.{{Cite book |last=Downs |first=Anthony John |title=Chemistry of aluminium, gallium, indium and thallium |date=1993 |publisher=Blackie |isbn=978-0-7514-0103-5 |location=London Glasgow New York [etc.]}} In the presence of water vapor, the compound reacts with oxygen at 245 °C to form indium(III) oxide iodide.{{Cite book |last=Hagen |first=A. P. |url=https://books.google.com/books?id=pDfY5xkvxeYC&pg=PA301 |title=Inorganic Reactions and Methods, The Formation of Bonds to Group VIB (O, S, Se, Te, Po) Elements (Part 1) |date=2009-09-17 |publisher=John Wiley & Sons |isbn=978-0-470-14540-1 |language=en}}
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.Taylor M. J., Kloo L. A. Journal of Raman Spectroscopy 31, 6, (2000), 465 The yellow form consists of In2I6 with 4 coordinate indium centres.
References
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{{Indium compounds}}
{{iodides}}