Tellurium monoiodide
{{chembox
| verifiedrevid =
| Name = Tellurium iodide
| OtherNames =
|Section1={{Chembox Identifiers
| index1_label = Te2I
| index2_label = TeI2
| CASNo = 12600-42-9
| CASNo_Ref = {{Cascite|correct|CAS}}
| ChemSpiderID = 103867644
| ChemSpiderID2 = 9146156
| PubChem = 92025674
| PubChem2 = 10970946
| StdInChI=1S/ITe/c1-2
| StdInChIKey = PNRYLQGKCSQOGH-UHFFFAOYSA-N
| SMILES = [Te]I
}}
|Section2={{Chembox Properties
| Formula = TeI
| MolarMass =
| Appearance = gray solid
| Density =
| MeltingPt =
| BoilingPt =
}}
|Section3={{Chembox Structure
| CrystalStruct =
}}
|Section7={{Chembox Hazards
| GHSPictograms = {{GHS07}}
| GHSSignalWord = warning
| HPhrases = {{HPhrases|H302|H312|H332}}
| PPhrases = {{PPhrases|P261|P264|P270|P271|P280|P301+P312|P302+P352|P304+P312|P304+P340| P312|P322| P330| P363|P501}}
| GHS_ref = GHS: [https://pubchem.ncbi.nlm.nih.gov/compound/11436476 PubChem]
}}
|Section8={{Chembox Related
| OtherAnions = ditellurium bromide
| OtherCations = selenium monochloride
| OtherCompounds = tellurium tetraiodide
}}
}}
Tellurium iodide is an inorganic compound with the formula TeI. Two forms are known. Their structures differ from the other monohalides of tellurium. There are three subiodides of tellurium, α-TeI, β-TeI, and Te2I, and one tellurium tetraiodide.
Preparation and properties
TeI is a gray solid formed by the solvothermal reaction of tellurium metal and iodine in hydroiodic or chloroaluminic acid.{{cite journal|title=Substitution of conventional high-temperature syntheses of inorganic compounds by near-room-temperature syntheses in ionic liquids|first1=Matthias F.|last=Groh|first2=Ulrike|last2=Müller|first3=Ejaz|last3=Ahmed|first4=Alexander|last4=Rothenberger|first5=Michael|last5=Ruck|journal=Zeitschrift für Naturforschung|year=2013|volume=68b|p=1110|doi=10.5560/ZNB.2013-3141|orig-date=June 3, 2013|publisher=Verlag der Zeitschrift für Naturforschung|location=Tübingen}} When this reaction is conducted near 270 °C gives the α-TeI, which is triclinic. When the same mixture is heated to 150 °C, one obtains the metastable monoclinic phase β-TeI.R. Kniep, D. Mootz, A. Rabenau "Zur Kenntnis der Subhalogenide des Tellurs" Zeitschrift für anorganische und allgemeine Chemie 1976, Volume 422, pages 17–38. {{doi|10.1002/zaac.19764220103}} The compounds are related structurally to Te2I (see ditellurium bromide), but the additional iodide groups do not bridge to other Te centers.
The corresponding monochloride and monobromide are molecular compounds with the formula Te2X2.Zhengtao Xu "Recent Developments in Binary Halogen–Chalcogen Compounds, Polyanions and Polycations" in Handbook of Chalcogen Chemistry: New Perspectives in Sulfur, Selenium and Tellurium, Francesco Devillanova, Editor, 2006, RSC. pp. 381-416. Royal Society {{doi|10.1039/9781847557575-00455}}
Tellurium diiodide
Although TeI2 has not been isolated in bulk, complexes of the type TeI2(thiourea)2 are well characterized. These complexes precipitate upon treatment of aqueous solutions of the related tellurium dibromide complex with sodium iodide.{{cite journal|title=Complexes of Divalent Tellurium with Thiourea|author1=Foss, Olav |author2=Hauge, Sverre |journal=Acta Chemica Scandinavica|year=1961|volume=15|pages= 1615–1616|doi=10.3891/acta.chem.scand.15-1615|doi-access=free}}
References
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{{Tellurium compounds}}