Login
Login

Thorium diiodide

{{Chembox

| ImageFile = Unit cell of ThI2.png

| ImageSize =

| ImageAlt =

| IUPACName =

| OtherNames =

| Section1 = {{Chembox Identifiers

| CASNo = 13779-95-8

| PubChem = 21115822

| StdInChI=1S/2HI.Th/h2*1H;/q;;+2/p-2

| StdInChIKey = WASWCTHKYRRDNN-UHFFFAOYSA-L

| SMILES = [Th+2].[I-].[I-]

}}

| Section2 = {{Chembox Properties

| Formula = ThI2

| MolarMass = 612.75

| Appearance = golden metallic

| Density = 7.21 g/cm3{{Cite journal |last=Guggenberger |first=Lloyd J. |last2=Jacobson |first2=R. A. |date=November 1968 |title=Crystal structure of thorium diiodide |url=https://pubs.acs.org/doi/abs/10.1021/ic50069a017 |journal=Inorganic Chemistry |language=en |volume=7 |issue=11 |pages=2257–2260 |doi=10.1021/ic50069a017 |issn=0020-1669|url-access=subscription }}

| MeltingPt = 850 °C{{Cite book |last=Edelstein |first=Norman M. |title=The chemistry of the actinide and transactinide elements |last2=Fuger |first2=J. |last3=Morss |first3=Lester R. |date=2010 |publisher=Springer |isbn=978-94-007-0211-0 |edition=4th |location=Dordrecht}}

| BoilingPt =

| Solubility = soluble

}}

| Section3 = {{Chembox Structure

| Coordination =

| CrystalStruct = hexagonal

| MolShape =

}}

| Section7 = {{Chembox Hazards

| MainHazards = Radioactive

| FlashPt =

| AutoignitionPt =

}}

| Section9 = {{Chembox Related

| OtherAnions =

| OtherCations = Cerium diiodide
Praseodymium diiodide
Gadolinium diiodide

| OtherFunction =

| OtherFunction_label =

| OtherCompounds = Thorium triiodide
Thorium tetraiodide

}}

}}

Thorium diiodide is an iodide of thorium, with the chemical formula of ThI2. It is an electride with the ionic formula Th4+(I−)2e−2. It is air-sensitive.

Preparation

Thorium diiodide cn be prepared by heating thorium tetraiodide in stoichiometric amounts of thorium:

:{{chem2|ThI4 + Th -> 2 ThI2}}

It can also be prepared by directly reacting thorium and iodine:{{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|Th + I2 -> ThI2}}

Thorium diiodide can also be prepared from the decomposition of thorium triiodide at temperatures above 550 °C:

:{{chem2|2 ThI3 -> ThI4 + ThI2}}

Properties

Like the diiodides of cerium, praseodymium and gadolinium, it has a metallic gold lustre and high electrical conductivity.{{Greenwood&Earnshaw|page=1272}}

References

{{reflist}}

{{Thorium compounds}}

{{Iodides}}

{{Actinide halides}}

Category:Iodides

Category:Thorium compounds