Tantalum (V) bromide
Structural formula | ||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
![]() |
||||||||||||||||
General | ||||||||||||||||
Surname | Tantalum (V) bromide | |||||||||||||||
other names |
Tantalum pentabromide |
|||||||||||||||
Molecular formula | TaBr 5 | |||||||||||||||
Brief description |
moisture-sensitive yellow solid with a characteristic odor |
|||||||||||||||
External identifiers / databases | ||||||||||||||||
|
||||||||||||||||
properties | ||||||||||||||||
Molar mass | 580.49 g mol −1 | |||||||||||||||
Physical state |
firmly |
|||||||||||||||
density |
4.989 g cm −3 |
|||||||||||||||
Melting point |
265 ° C |
|||||||||||||||
boiling point |
348.8 ° C |
|||||||||||||||
solubility |
reacts with water |
|||||||||||||||
safety instructions | ||||||||||||||||
|
||||||||||||||||
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . |
Tantalum (V) bromide is an inorganic chemical compound of tantalum from the group of bromides .
Extraction and presentation
Tantalum (V) bromide can be obtained by reacting tantalum with bromine at 230–250 ° C.
Alternatively, it can be obtained by reacting tantalum (V) oxide with tetrabromomethane or aluminum (III) bromide .
properties
Tantalum (V) bromide is a very moisture-sensitive, yellow solid that smokes in air and has a characteristic odor. It has a monoclinic crystal structure isotypic to that of α- niobium (V) chloride with the space group C 2 / m (space group no. 12) and 6 formula units in the unit cell (a = 1943.3 pm, b = 1877.5 pm, c = 620.3 pm, β = 90.72 °). The structure of tantalum (V) bromide was first described in 1958 by RF Rolsten , who, however, determined an orthorhombic crystal structure with the space group Pbma (No. 57, position 5) . Like tantalum (V) iodide, it is made up of dimeric molecules.
use
Tantalum (V) bromide can be used as a catalyst in organic syntheses.
Individual evidence
- ↑ a b c d e f g h i data sheet Tantalum (V) bromide, 99.9% (metals basis) from AlfaAesar, accessed on June 21, 2013 ( PDF )(JavaScript required) .
- ↑ a b 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. 1455.
- ^ Jean d'Ans, Ellen Lax, Roger Blachnik: Pocket book for chemists and physicists . Springer DE, 1998, ISBN 3-642-58842-5 , pp. 752 f . ( limited preview in Google Book search).
- ↑ Katja Habermehl; New studies on halides of niobium and tantalum (PDF; 3.9 MB), urn : nbn: de: hbz: 38-31032 , April 22, 2010.
- ↑ Julio Alvarez-Builla, Juan José Vaquero, José Barluenga: Modern Heterocyclic Chemistry. 4 volumes . John Wiley & Sons, 2011, ISBN 978-3-527-33201-4 , pp. 1542 ( limited preview in Google Book search).