Ytterbium (II) bromide

Crystal structure
	__ Yb 2+ __ Br -
General
Surname	Ytterbium (II) bromide
other names	Ytterbium dibromide
Ratio formula	YbBr 2
Brief description	light yellow solid
External identifiers / databases
Wikidata	Q15628024
properties
Molar mass	332.84 g mol −1
Physical state	firmly
Melting point	613 ° C
boiling point	1140 ° C
safety instructions
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 .

Ytterbium (II) bromide is an inorganic chemical compound of ytterbium from the group of bromides .

Extraction and presentation

Ytterbium (II) bromide can be obtained by reducing ytterbium (III) bromide with hydrogen at 500 ° C to 600 ° C.

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

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

{\ displaystyle \ mathrm {Yb + 2 \ NH_ {4} Br \ longrightarrow YbBr_ {2} +2 \ NH_ {3} + H_ {2}}}

Ytterbium (II) bromide can also be obtained by reducing ytterbium (III) bromide with ytterbium in a vacuum at 960 ° C.

{\ displaystyle \ mathrm {Yb + 2 \ YbBr_ {3} \ longrightarrow 3 \ YbBr_ {2}}}

properties

Ytterbium (II) bromide is a light yellow 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 , but these are unstable and more or less quickly turn into oxide bromides with evolution of hydrogen . The compound has an orthorhombic crystal structure of strontium (II) iodide ( space group Pbca (space group no. 61) ) or calcium chloride type with the space group Pnnm (no. 58) . The lattice parameters of the latter form are a = 6.63 Å, b = 6.93 Å and c = 4.37 Å. However, it is only observed when the sample is contaminated with trivalent Yb. Template: room group / 61Template: room group / 58

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g 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.
↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
↑ ^a ^b ^c Christine A. Voos-Esquivel, Harry A. Eick: Synthesis of YbBr ₂ and YbCl ₂ and an x-ray diffraction study of the system YbBr ₂ -YbCl ₂ . In: Journal of Solid State Chemistry . 67, 1987, pp. 291-296, doi : 10.1016 / 0022-4596 (87) 90366-5 .
↑ Horst. P. Beck, H. Bärnighausen: On the crystal chemistry of the ytterbium (II) halides YbCl ₂ and YbBr ₂ . In: Journal of Inorganic and General Chemistry. 386, 1971, pp. 221-228, doi : 10.1002 / zaac.19713860214 .

[brauer-1] ↑ ^a ^b ^c ^d ^e ^f ^g 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.

[NV-2] This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.

[DOI10.1016/0022-4596(87)90366-5-3] Christine A. Voos-Esquivel, Harry A. Eick: Synthesis of YbBr ₂ and YbCl ₂ and an x-ray diffraction study of the system YbBr ₂ -YbCl ₂ . In: Journal of Solid State Chemistry . 67, 1987, pp. 291-296, doi : 10.1016 / 0022-4596 (87) 90366-5 .

[DOI10.1002/zaac.19713860214-4] Horst. P. Beck, H. Bärnighausen: On the crystal chemistry of the ytterbium (II) halides YbCl ₂ and YbBr ₂ . In: Journal of Inorganic and General Chemistry. 386, 1971, pp. 221-228, doi : 10.1002 / zaac.19713860214 .