Niobium(IV) iodide

Niobium iodide is an iodide of niobium, with the chemical formula of NbI₄.

Preparation

Niobium iodide can be obtained by the decomposition of niobium(V) iodide under a vacuum at 206-270 °C.

Properties

Niobium iodide is a grey solid that reacts with water.
Niobium iodide is an orthorhombic crystal with space group Cmc2₁. Its crystal is formed by NbI₆ octahedra connected by edges and also contains Nb-Nb bonds. At 348 to 417 °C, the crystal structure of niobium iodide changes. Niobium iodide turns into a metal under extremely high pressure.