Arsenic Triiodide

Arsenic triiodide is a chemical compound with the formula AsI3. It is a dark-red solid that is highly reactive and somewhat toxic. The compound belongs to the group of interhalogens, which are formed by combining halogens with elements from groups 13-17 of the periodic table.

In its solid state, arsenic triiodide adopts a layered structure consisting of AsI4 tetrahedra connected through shared iodine atoms. The layers stack on top of each other in an ABAB sequence, creating a three-dimensional lattice held together by van der Waals forces.

Arsenic triiodide is soluble in many organic solvents but insoluble in water. It reacts readily with water to form arsenious acid (H3AsO3) and hydroiodic acid (HI).

The compound has been studied for its potential applications in various areas, including as a reagent in organic synthesis and as a semiconductor material. However, its toxicity and instability limit its practical uses.