Vanadium (III) iodide

Crystal structure
	__ V 3+ __ I -
General
Surname	Vanadium (III) iodide
other names	Vanadium triiodide; Vanadium (III) iodide; Vanadium triiodide;
Ratio formula	VI 3
Brief description	crystalline, brown-black solid
External identifiers / databases
EC number	239-547-7
ECHA InfoCard	100.035.937
PubChem	3627252
Wikidata	Q418337
properties
Molar mass	431.655 g mol −1
Physical state	firmly
density	5.21 g cm −3
Sublimation point	80-100 ° C
solubility	Decomposes in water
safety instructions
GHS labeling of hazardous substances danger
H and P phrases	H: 314
	P: 280-305 + 351 + 338-310
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

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

Extraction and presentation

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

{\ displaystyle {\ ce {2V + 3I2 -> 2VI3}}}

Vanadium reacts with iodine in a molar ratio of 2: 3 to vanadium (III) iodide.

properties

Vanadium (III) iodide crystallizes in the trigonal crystal system in the space group R 3 (space group no. 148) with the lattice parameters a = 692.5 pm and c = 1991 pm and 6 formula units per unit cell . It thus corresponds to a bismuth (III) iodide structure. Template: room group / 148

Vanadium (III) iodide is sensitive to oxidation and very hygroscopic. It dissolves very easily in water with the formation of [V (H ₂ O) ₆ ] ³⁺ ions. The solution is brown in color, which turns green when acid is added.

use

Vanadium (III) iodide is an intermediate in the purification of vanadium by the Van Arkel de Boer process . The vanadium (III) iodide is formed from the elements at relatively low temperatures, sublimed and decomposed again into the elements on a hot wire.

Individual evidence

↑ ^a ^b ^c ^d Vanadium (III) iodide on webelements.com
^ ^A ^b ^c A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 102nd edition. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1 , p. 1550.
↑ ^a ^b Data sheet Vanadium (III) iodide from Sigma-Aldrich , accessed on April 25, 2011 ( PDF ).
^ W. Pies, A. Weiss: a 3622, I.4.1 Simple iodides and their solid solutions. In: K.-H. Hellwege, AM Hellwege (ed.): SpringerMaterials - The Landolt-Börnstein Database . doi : 10.1007 / 10201462_57 .
↑ Georg Brauer (ed.) U. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume III, Ferdinand Enke, Stuttgart 1981, ISBN 3-432-87823-0 , p. 1415.
^ AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 102nd edition. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1 , p. 1543.

[webelements-1] Vanadium (III) iodide on webelements.com

[howi-2] A ^b ^c A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 102nd edition. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1 , p. 1550.

[Sigma-3] Data sheet Vanadium (III) iodide from Sigma-Aldrich , accessed on April 25, 2011 ( PDF ).

[4] W. Pies, A. Weiss: a 3622, I.4.1 Simple iodides and their solid solutions. In: K.-H. Hellwege, AM Hellwege (ed.): SpringerMaterials - The Landolt-Börnstein Database . doi : 10.1007 / 10201462_57 .

[brauer-5] Georg Brauer (ed.) U. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume III, Ferdinand Enke, Stuttgart 1981, ISBN 3-432-87823-0 , p. 1415.

[6] AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 102nd edition. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1 , p. 1543.