Niobium(V) iodide is the inorganic compound with the formula Nb₂I₁₀. Its name comes from the compound's

empirical formula In chemistry, the empirical formula of a chemical compound is the simplest whole number ratio of atoms present in a compound. A simple example of this concept is that the empirical formula of sulfur monoxide, or SO, would simply be SO, as is the ...

, NbI₅. It is a diamagnetic, yellow solid that hydrolyses readily. The compound adopts an edge-shared bioctahedral structure, which means that two NbI₅ units are joined by a pair of iodide bridges. There is no bond between the Nb centres.

Niobium(V) chloride Niobium(V) chloride, also known as niobium pentachloride, is a yellow crystalline solid. It hydrolyzes in air, and samples are often contaminated with small amounts of NbOCl3. It is often used as a precursor to other compounds of niobium. NbCl ...

niobium(V) bromide Niobium(V) bromide is the inorganic compound with the formula Nb2Br10. Its name comes from the compound's empirical formula, NbBr5. It is a diamagnetic, orange solid that hydrolyses readily. The compound adopts an edge-shared bioctahedral struc ...

tantalum(V) chloride Tantalum(V) chloride, also known as tantalum pentachloride, is an inorganic compound with the formula TaCl5. It takes the form of a white powder and is commonly used as a starting material in tantalum chemistry. It readily hydrolyzes to form tanta ...

, tantalum(V) bromide, and

tantalum(V) iodide Tantalum(V) iodide is the inorganic compound with the formula Ta2I10. Its name comes from the compound's empirical formula, TaI5. It is a diamagnetic, black solid that hydrolyses readily. The compound adopts an edge-shared bioctahedral structure, ...

, all share this structural motif.

Synthesis and structure

Niobium pentaiodide forms from the reaction of niobium with iodine: :2 Nb + 5 I₂ → 2 NbI₅ The method used for the preparation of tantalum(V) iodide using aluminium triiodide fails to produce pure pentaiodide.

References

{{iodides Iodides Niobium(V) compounds Metal halides