Tantalum(V) iodide

{{Chembox

| ImageFile = Ta2I10.svg

| ImageSize =

| ImageAlt =

| IUPACName =

| OtherNames = Tantalum pentaiodide

|Section1={{Chembox Identifiers

| CASNo1 = 14693-81-3

| CASNo1_Comment = TaI₅

| CASNo1_Ref = {{Cascite|correct|CAS}}

| CASNo2 = 26814-38-0

| CASNo2_Comment = Ta₂I₁₀

| ChemSpiderID = 76319

| EC_number = 238-742-4

| PubChem = 84598

| StdInChI=1S/5HI.Ta/h5*1H;/q;;;;;+5/p-5

| StdInChIKey = MISXNQITXACHNJ-UHFFFAOYSA-I

| SMILES = [I-].[I-].[I-].[I-].[I-].[Ta+5]

}}

|Section2={{Chembox Properties

| Formula = {{chem2|Ta2I10}}

| Ta=2|I=10

| Appearance = black solid

| Density = 5.8 g/cm³

| MeltingPtC = 382 {{cite journal|doi=10.1021/ic50032a029|title=The Equilibrium Phase Diagrams for the Tantalum-Tantalum Bromide and Tantalum-Tantalum Iodide Systems|year=1965|last1=McCarley|first1=R. E.|last2=Boatman|first2=J.C.|journal=Inorganic Chemistry|volume=4|issue=10|pages=1486–1491|s2cid=67778953 |url=https://lib.dr.iastate.edu/cgi/viewcontent.cgi?article=4835&context=rtd}}

| MeltingPt_notes = sublimes

| BoilingPt =

| Solubility = }}

|Section7={{Chembox Hazards

| GHSPictograms = {{GHS05}}{{GHS06}}

| GHSSignalWord = Danger

| HPhrases = {{H-phrases|314|331}}

| PPhrases = {{P-phrases|260|261|264|271|280|301+330+331|303+361+353|304+340|305+351+338|310|311|321|363|403+233|405|501}}

| MainHazards =

| FlashPt =

| AutoignitionPt = }}

| Section9 = {{Chembox Related

| OtherAnions = {{ubl|Tantalum(V) fluoride|Tantalum(V) chloride|Tantalum(V) bromide}}

| OtherCations = {{ubl|Protactinium(V) iodide|Niobium(V) iodide}}

| OtherCompounds = {{ubl|Tantalum(IV) iodide}}

}}

}}

Tantalum(V) iodide is the inorganic compound with the formula Ta₂I₁₀. Its name comes from the compound's empirical formula, TaI₅.Greenwood, N. N.; & Earnshaw, A. (1997). Chemistry of the Elements (2nd Edn.), Oxford: Butterworth-Heinemann. {{ISBN|0-7506-3365-4}}. It is a diamagnetic, black solid that hydrolyses readily. The compound adopts an edge-shared bioctahedral structure, which means that two TaI₅ units are joined by a pair of iodide bridges. There is no bond between the Ta centres.{{cite journal|doi=10.1107/S0567740879009778|title=Die Kristallstruktur von Tantalpentajodid und ihre Fehlordnung|year=1979|last1=Müller|first1=U.|journal=Acta Crystallographica Section B: Structural Crystallography and Crystal Chemistry|volume=35|issue=11|pages=2502–2509|bibcode=1979AcCrB..35.2502M }} Niobium(V) chloride, niobium(V) bromide, niobium(V) iodide, tantalum(V) chloride, and tantalum(V) bromide all share this structural motif.