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
EC number	236-618-4
ECHA InfoCard	100.033.276
PubChem	83480
Wikidata	Q2349635
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
H and P phrases	H: 314-302-312-332
	P: 260-303 + 361 + 353-305 + 351 + 338-301 + 330 + 331-405-501
	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.

{\ displaystyle \ mathrm {2 \ Ta + 5 \ Br_ {2} \ longrightarrow 2 \ TaBr_ {5}}}

Alternatively, it can be obtained by reacting tantalum (V) oxide with tetrabromomethane or aluminum (III) bromide .

{\ displaystyle \ mathrm {Ta_ {2} O_ {5} +5 \ CBr_ {4} \ longrightarrow 2 \ TaBr_ {5} + CO + 5 \ Br_ {2}}}

{\ displaystyle \ mathrm {Ta_ {2} O_ {5} +5 \ AlBr_ {3} \ longrightarrow 2 \ TaBr_ {5} +5 \ AlOBr}}

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. Template: room group / 12Template: room group / 57.5

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).

[Alfa-1] ↑ ^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) .

[brauer-2] 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-3] 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).

[4] 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-5] 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).