Indium(III) iodide or indium triiodide is a chemical compound of indium and iodine with the formula InI3.
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Other names
Indium triiodide
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3D model (JSmol)
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ECHA InfoCard | 100.033.475 |
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PubChem CID
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UNII |
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CompTox Dashboard (EPA)
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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) |
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Other anions
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Indium(III) bromide Indium(III) chloride |
Other cations
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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
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Indium(III) iodide can be obtained by reacting indium with iodine vapor:[1]
Indium(III) iodide can also be obtained by evaporation of a solution of indium in HI.[2]
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.