Protactinium (V) bromide

General
Surname	Protactinium (V) bromide
other names	Protactinium pentabromide
Molecular formula	PaBr 5
Brief description	orange-red solid
External identifiers / databases
Wikidata	Q17325761
properties
Molar mass	630.56 g mol −1
Physical state	firmly
solubility	reacts with water
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 .

Protactinium (V) bromide is a chemical compound of protactinium from the group of bromides .

presentation

Protactinium (V) bromide can be obtained by reacting protactinium (V) chloride with boron tribromide at 500 to 550 ° C.

{\ displaystyle {\ ce {3 PaCl5 + 5 BBr3 -> 3 PaBr5 + 5 BCl3}}}

It can also be obtained by reacting protactinium (V) oxide with aluminum tribromide at 400 ° C.

properties

Protactinium (V) bromide is an orange-red, crystalline, extremely moisture-sensitive solid that reacts violently with water and ammonia , but is stable in absolutely dry air. It is practically insoluble in isopentane , dichloromethane and benzene ; in anhydrous acetonitrile it dissolves to PaBr ₅ · 4CH ₃ CN. It comes in several modifications. Below 400 ° C as an α modification and above as a β modification. The α-form has a monoclinic crystal structure with the space group P 2 ₁ / c (space group no. 14) and the lattice parameters a = 1296 pm, b = 1282 pm, c = 992 pm, β = 108 ° and β-form as well a monoclinic crystal structure with the space group P 2 ₁ / n (No. 14, position 2) and the lattice parameters a = 838.5 pm, b = 1120.5 pm, c = 895.0 pm, β = 91.1 °. The β form is in the form of a dimer. Protactinium (V) bromide sublimes at 400 ° C in a vacuum. A γ-form was also detected, which has a crystal structure of the β- uranium (V) chloride type. Template: room group / 14Template: room group / 14.2

Individual evidence

↑ ^a ^b ^c ^d ^e Georg Brauer (Ed.), With the collaboration of Marianne Baudler u. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 1177.
↑ 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.
↑ Advances in Inorganic Chemistry and Radiochemistry . Academic Press, 1970, pp. 31 ( limited preview in Google Book search).
↑ D. Brown, TJ Petcher, AJ Smith: The crystal structure of β-protactinium pentabromide. In: Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry. 25, pp. 178-182, doi : 10.1107 / S0567740869007357 .
↑ D. Brown: The polymorphism of protactinium pentabromide. In: Inorganic and Nuclear Chemistry Letters. 15, 1979, pp. 219-223, doi : 10.1016 / 0020-1650 (79) 80132-4 .

[brauer-1] Georg Brauer (Ed.), With the collaboration of Marianne Baudler u. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 1177.

[NV-2] 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.

[3] Advances in Inorganic Chemistry and Radiochemistry . Academic Press, 1970, pp. 31 ( limited preview in Google Book search).

[DOI10.1107/S0567740869007357-4] D. Brown, TJ Petcher, AJ Smith: The crystal structure of β-protactinium pentabromide. In: Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry. 25, pp. 178-182, doi : 10.1107 / S0567740869007357 .

[DOI10.1016/0020-1650(79)80132-4-5] D. Brown: The polymorphism of protactinium pentabromide. In: Inorganic and Nuclear Chemistry Letters. 15, 1979, pp. 219-223, doi : 10.1016 / 0020-1650 (79) 80132-4 .