Vanadium(III) iodide

• Vanadiumtriiodid
• Vanadium (III ) iodide
• Vanadintriiodid

Crystalline, brown black solid

Fixed

5.21 g · cm -3

80-100 ° C.

Decomposition in water

Risk

Template: Infobox chemical / molecular formula search available

Vanadium ( III) iodide, is a chemical compound of the elements vanadium, and iodine. It is a brown-black, hygroscopic solid which was sublimed at 80-100 ° C.

Production and representation

Vanadium ( III) iodide, can be obtained from the following elements:

Properties

Vanadium (III ) iodide crystallizes in the hexagonal crystal system in the space group with the lattice parameters a = 692.5 pm and c = 1991 pm and 6 formula units per unit cell. So that it corresponds to a bismuth ( III ) iodide structure.

Vanadium (III ) iodide is sensitive to oxidation and very hygroscopic. It dissolves in water very easily to form [ V (H2O ) 6] 3 ions. The solution has a brown color, which changes to green when the addition of acid.

Use

Vanadium ( III) iodide, is an intermediate in the purification of vanadium by the Van Arkel - de Boer method. Here, the vanadium (III ) iodide is formed at relatively low temperatures of the elements, sublimated and decomposes on a hot wire back into the elements.