Technetium(III) iodide
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| Section1 = {{Chembox Identifiers
| CASNo = 1509903-36-9
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| StdInChI=1S/3HI.Tc/h3*1H;/q;;;+3/p-3
| StdInChIKey=GRXKOOLXSFLODZ-UHFFFAOYSA-K
| SMILES = [Tc+3].[I-].[I-].[I-]
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| Section2 = {{Chembox Properties
| Formula = TcI3
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| Appearance = black solid
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| Solubility = insoluble
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| Section3 = {{Chembox Hazards
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Technetium(III) iodide is an inorganic compound with the chemical formula TcI3. It is the first iodide of technetium discovered and was first reported in 2013. Theoretical studies have shown that a single layer of TcI3 is ferromagnetic.{{cite journal|last1=Liu|first1=Tian|last2=Zhou|first2=Na|last3=Li|first3=Xu|last4=Zhu|first4=Guojun|last5=Wei|first5=Xiaolin|last6=Cao|first6=Juexian|title=Prediction of colossal magnetocrystalline anisotropy for transition metal triiodides|journal=Journal of Physics: Condensed Matter|volume=31|issue=29|year=2019|pages=295801|issn=0953-8984|doi=10.1088/1361-648X/ab1885|pmid=30974424 |bibcode=2019JPCM...31C5801L |s2cid=109941190 }}
It can be obtained by the reaction of Tc2(CH3COO)4Cl2 and hydrogen iodide at 150 °C, or by the reaction of technetium and iodine at 300~400 °C. It decomposes in a vacuum at 450 °C to produce the metal technetium.{{cite journal|journal=Inorganic Chemistry|volume=52|issue=24|language=en|issn=0020-1669|date=2013-12-16|pages=14309–14316|doi=10.1021/ic402278c|url=https://pubs.acs.org/doi/10.1021/ic402278c|title=Synthetic and Coordination Chemistry of the Heavier Trivalent Technetium Binary Halides: Uncovering Technetium Triiodide|accessdate=2021-04-16|author=Erik V. Johnstone, Frederic Poineau, Jenna Starkey, Thomas Hartmann, Paul M. Forster, Longzhou Ma, Jeremy Hilgar, Efrain E. Rodriguez, Romina Farmand, Kenneth R. Czerwinski, Alfred P. Sattelberger|pmid=24295331 }}