Europium (II) bromide

Crystal structure
	__ Eu 2+ __ Br -
General
Surname	Europium (II) bromide
other names	Europium dibromide
Ratio formula	EuBr 2
Brief description	white solid
External identifiers / databases
EC number	681-026-5
ECHA InfoCard	100.206.203
PubChem	139600
Wikidata	Q15628205
properties
Molar mass	311.77 g mol −1
Physical state	firmly
Melting point	683 ° C
boiling point	1230 ° C
solubility	soluble in water
safety instructions
GHS labeling of hazardous substances Caution
H and P phrases	H: 315-319
	P: 305 + 351 + 338
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Europium (II) bromide is an inorganic chemical compound of europium from the group of bromides .

Extraction and presentation

Europium (II) bromide can be obtained by reducing europium (III) bromide with hydrogen at 350 ° C.

{\ displaystyle \ mathrm {2 \ EuBr_ {3} + H_ {2} \ longrightarrow 2 \ EuBr_ {2} +2 \ HBr}}

The representation by thermal decomposition of europium (III) bromide at 200 ° C is also possible.

{\ displaystyle \ mathrm {2 \ EuBr_ {3} \ longrightarrow 2 \ EuBr_ {2} + Br_ {2}}}

The reaction of europium with ammonium bromide in liquid ammonia at −78 ° C is also possible. First of all, the ammonia from europium (II) bromide is obtained, which can then be broken down at around 200 ° C in a high vacuum.

{\ displaystyle \ mathrm {Eu + 2 \ NH_ {4} Br \ longrightarrow EuBr_ {2} +2 \ NH_ {3} + H_ {2}}}

properties

Europium (II) bromide is a white solid. The connection is extremely hygroscopic and can only be stored and handled under carefully dried protective gas or in a high vacuum. In air or in contact with water, it changes into hydrates while absorbing moisture . The compound has a crystal structure of the strontium bromide type with the space group P 4 / nmm (space group no. 129) . At high pressure and 400 ° C, the compound changes into a high pressure variant with an orthorhombic crystal structure and the space group Pbnm (no. 62, position 3) isotypic to that of lead (II) chloride . Template: room group / 129Template: room group / 62.3

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g ^h 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. 1081.
↑ ^a ^b ^c Datasheet Europium (II) bromide, 99.99% trace metals basis from Sigma-Aldrich , accessed on May 3, 2014 ( PDF ).
↑ E. Yu Tonkov: High Pressure Phase Transformations Handbook 1 . CRC Press, 1992, ISBN 2-88124-758-X , pp. 125 ( limited preview in Google Book Search).

[brauer-1] ↑ ^a ^b ^c ^d ^e ^f ^g ^h 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. 1081.

[Sigma-2] Datasheet Europium (II) bromide, 99.99% trace metals basis from Sigma-Aldrich , accessed on May 3, 2014 ( PDF ).

[E._Yu_Tonkov-3] E. Yu Tonkov: High Pressure Phase Transformations Handbook 1 . CRC Press, 1992, ISBN 2-88124-758-X , pp. 125 ( limited preview in Google Book Search).