Thulium(III) iodide
{{Chembox
| Name = Thulium(III) iodide
| ImageFile=Kristallstruktur Bismut(III)-iodid.png
| ImageFile2 = Thullium(III)_iodide_crystals_in_glass_ampoule.jpg
| OtherNames = Thulium iodide
Thulium triiodide
| Section1 = {{Chembox Identifiers
| CASNo = 13813-43-9
| CASNo_Ref = {{cascite|correct|CAS}}
| ChemSpiderID = 75572
| PubChem = 83750
| EC_number = 237-472-4
| StdInChI=1S/3HI.Tm/h3*1H;/q;;;+3/p-3
| StdInChIKey = LZOMHYVAEHYDST-UHFFFAOYSA-K
| SMILES = I[Tm](I)I
}}
| Section2 = {{Chembox Properties
| Formula = TmI3
| MolarMass =
| Appearance = Yellow hexagonal crystal王世华,谷亚平,蒋盛邦.在Tm-HgI2体系中TmI2生成机理[J].物理化学学报,1987(03):334-336.
| Density =
| Solubility =
| MeltingPt = 1015 °CJantsch, G.; Zeitschrift fuer Anorganische und Allgemeine Chemie 1933, V212, P65-83 CAPLUS
}}
}}
Thulium(III) iodide is an iodide of thulium, with the chemical formula of TmI3. Thulium(III) iodide is used as a component of metal halide lamps.{{cite book|first1=Peter G. |last1=Flesch|title=Light and Light Sources: High-Intensity Discharge Lamps|publisher=Springer|year=2007|page=45|isbn=9783540326847|url=https://books.google.com/books?id=fWHQbhgxpAkC&pg=PA45
}}
Preparation
Mercury(II) iodide can be heated with thulium to obtain thulium(III) iodide:Georg Brauer (Hrsg.), unter Mitarbeit von Marianne Baudler u. a.: Handbuch der Präparativen Anorganischen Chemie. 3., umgearbeitete Auflage. Band I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6, S. 1077.
: 2 Tm + 3 HgI2 → 2 TmI3 + 3 Hg
The mercury produced in the reaction can be removed by distillation.Asprey, L. B.; Keenan, T. K.; Kruse, F. H. Preparation and crystal data for lanthanide and actinide triiodides. Inorg. Chem., 1964. 3 (8): 1137-1240
The thulium(III) iodide hydrate crystallized from solution can be heated with ammonium iodide to obtain the anhydrous form.无机化学丛书 第七卷 钪 稀土元素. 科学出版社. pp 211
Properties
Thulium(III) iodide is a yellow, highly hygroscopic solid with a bismuth(III) iodide-type crystal structure. It forms in the hexagonal crystal system. Its hydrate can be heated in air to obtain TmOI. Its anhydrous form can be heated with thulium to obtain TmI2:{{cite journal|url=http://linkinghub.elsevier.com/retrieve/pii/0022190260802321|pages=32–35|title=Divalent thulium. Thulium di-iodide|journal=Journal of Inorganic and Nuclear Chemistry|volume=13|issue=1–2|accessdate=2018-04-13|doi=10.1016/0022-1902(60)80232-1|author=L.B. Asprey, F.H. Kruse|year=1960 |archive-date=2018-06-09|archive-url=https://web.archive.org/web/20180609163225/https://linkinghub.elsevier.com/retrieve/pii/0022190260802321|url-status=live|url-access=subscription}}（注：此文献指出Tm+HgI2的反应生成TmI2）
: 2 TmI3 + Tm → 3 TmI2
References
{{reflist}}
{{Thulium compounds}}
{{Iodides}}
{{Lanthanide halides}}