Diarsenic tetraiodide

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| ImageFile = Diphosphorus-tetraiodide-3D-balls.png

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| IUPACName = Arsenic diiodide

|Section1={{Chembox Identifiers

| CASNo = 13770-56-4

| CASNo_Ref = {{Cascite|correct|CAS}}

| PubChem = 165365657

| SMILES = I[As](I)[As](I)I

| InChI = 1S/As.2HI/h;2*1H/p-2

| InChIKey = YWEMTIDRPOANDU-UHFFFAOYSA-L

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|Section2={{Chembox Properties

| Formula = As₂I₄

| MolarMass = 657.461 g/mol

| Appearance = Red crystalline solid

| BoilingPtC = 380

| MeltingPtC = 137

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Diarsenic tetraiodide is an inorganic compound of arsenic and iodine. It is a dark red metastable solid. The compound is a closely related to the better characterized diphosphorus tetraiodide. Identified in the late 19th century with the (accurate) empirical formula AsI₂,{{cite journal |first1= Eugen |last1= Bamberger |first2= Julius |last2= Philipp |title= Ueber Verbindungen von Arsen und Jod |journal= Berichte der Deutschen Chemischen Gesellschaft |volume= 14 |issue= 2 |pages= 2643–2648 |year= 1881 |doi= 10.1002/cber.188101402228 |url= https://zenodo.org/record/1425240 }} the compound was assigned the formula (As₂I₄) several years later.{{cite journal |title= LXXXIX.—Arsenic di-iodide |first1= John Theodore |last1= Hewitt |first2= Thomas Field |last2= Winmill |journal= J. Chem. Soc., Trans. |year= 1907 |volume= 91 |pages= 962–964 |doi= 10.1039/CT9079100962 |url= https://zenodo.org/record/1879397 }}