Uranium (IV) bromide

Crystal structure
	__ U 4+ __ Br -
Crystal system	monoclinic
Space group	C 2 / m (No. 12)
Lattice parameters	a = 1092 pm ; b = 869 pm ; c = 705 pm ; β = 93 ° 15 '
General
Surname	Uranium (IV) bromide
other names	Uranium tetrabromide
Ratio formula	UBr 4
Brief description	deep brown solid
External identifiers / databases
EC number	236-734-5
ECHA InfoCard	100.033.380
PubChem	83507
Wikidata	Q7899711
properties
Molar mass	557.65 g mol −1
Physical state	firmly
density	5.55 g cm −3
Melting point	519 ° C
boiling point	761 ° C
solubility	soluble in water and ethanol
Hazard and safety information
	; Radioactive
GHS hazard labeling ; no classification available
GHS hazard labeling ; no classification available
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Uranium (IV) bromide is a chemical compound made up of the elements uranium and bromine . It has the formula UBr ₄ and belongs to the class of the bromides .

presentation

Uranium (IV) bromide can be obtained by reacting uranium with bromine at 600 ° C to 700 ° C.

{\ displaystyle {\ ce {U + 2 Br2 -> UBr4}}}

Alternatively, the compound can be obtained from uranium (III) hydride by a two-step reaction . For this purpose, this is reacted with hydrogen bromide to form uranium (III) bromide and this with bromine at 300 ° C to form uranium (IV) bromide.

{\ displaystyle {\ ce {UH3 + 3 HBr -> UBr3 + 3 H2}}}

{\ displaystyle {\ ce {2 UBr3 + Br2 -> 2 UBr4}}}

It is also possible to display it by reacting uranium (IV) oxide or uranium (V, VI) oxide with coal and bromine.

{\ displaystyle {\ ce {U3O8 + 4 C + 6 Br2 -> 3 UBr4 + 4 CO2}}}

In addition, a few other display methods are known.

properties

Uranium (IV) bromide is a deep brown, very hygroscopic , crystalline solid. It has a monoclinic crystal structure with the space group C 2 / m (space group no. 12) and the lattice parameters a = 1092 pm, b = 869 pm, c = 705 pm and β = 93 ° 15 ′. Template: room group / 12

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j Georg Brauer (Ed.): Handbook of Preparative Inorganic Chemistry . 3., reworked. Edition. tape II . Enke, Stuttgart 1978, ISBN 3-432-87813-3 , p. 1214 .
^ Lester R. Morss, Norman M. Edelstein, J. Fuger: The Chemistry of the Actinide and Transactinide Elements (Set Vol.1-6) . Springer Science & Business Media, 2010, ISBN 978-94-007-0211-0 , p. 1795 ( limited preview in Google Book search).
^ William M. Haynes: CRC Handbook of Chemistry and Physics, 93rd Edition . CRC Press, 2012, ISBN 978-1-4398-8049-4 , pp. 97 ( limited preview in Google Book search).
↑ The hazards emanating from radioactivity do not belong to the properties to be classified according to the GHS labeling. With regard to other hazards, this substance has either not yet been classified or a reliable and citable source has not yet been found.
^ JJ Katz, Eugene Rabinowitch: The Chemistry of Uranium . 1961, ISBN 5-88135-966-6 , pp. 521 ( limited preview in Google Book search).
^ RM Douglass, Eugene Staritzky: Crystallographic Data. 153. Uranium Tetrabromide, UBr ₄ In: Analytical Chemistry. 29, 1957, pp. 459-459, doi: 10.1021 / ac60123a607 .

[brauer-1] ↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j Georg Brauer (Ed.): Handbook of Preparative Inorganic Chemistry . 3., reworked. Edition. tape II . Enke, Stuttgart 1978, ISBN 3-432-87813-3 , p. 1214 .

[Lester_R._Morss,_Norman_M._Edelstein,_J._Fuger-2] Lester R. Morss, Norman M. Edelstein, J. Fuger: The Chemistry of the Actinide and Transactinide Elements (Set Vol.1-6) . Springer Science & Business Media, 2010, ISBN 978-94-007-0211-0 , p. 1795 ( limited preview in Google Book search).

[William_M._Haynes-3] William M. Haynes: CRC Handbook of Chemistry and Physics, 93rd Edition . CRC Press, 2012, ISBN 978-1-4398-8049-4 , pp. 97 ( limited preview in Google Book search).

[NV-4] The hazards emanating from radioactivity do not belong to the properties to be classified according to the GHS labeling. With regard to other hazards, this substance has either not yet been classified or a reliable and citable source has not yet been found.

[J.J._Katz,_Eugene_Rabinowitch-5] JJ Katz, Eugene Rabinowitch: The Chemistry of Uranium . 1961, ISBN 5-88135-966-6 , pp. 521 ( limited preview in Google Book search).

[DOI10.1021/ac60123a607-6] RM Douglass, Eugene Staritzky: Crystallographic Data. 153. Uranium Tetrabromide, UBr ₄ In: Analytical Chemistry. 29, 1957, pp. 459-459, doi: 10.1021 / ac60123a607 .