Nickel (II) bromide

Crystal structure
	_ Ni 2+ 0 _ Br -
General
Surname	Nickel (II) bromide
other names	Nickel dibromide; Nickel bromide;
Ratio formula	NiBr 2
Brief description	yellow-orange solid
External identifiers / databases
EC number	236-665-0
ECHA InfoCard	100.033.318
PubChem	278492
ChemSpider	24251
Wikidata	Q419684
properties
Molar mass	218.501 g mol −1
Physical state	firmly
density	5.09 g cm −3
Melting point	sublimed at 965 ° C
solubility	easily soluble in water (567 g l −1 at 20 ° C) and ethanol ; soluble in methanol , acetone and quinoline ; insoluble in toluene ;
safety instructions
H and P phrases	H: 317-334-341-350i-360D-372-410
	P: 201-261-273-280-308 + 313-501
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Nickel (II) bromide , NiBr ₂ , the nickel - salt of hydrobromic acid . It forms yellow-brown, rhombohedral , hygroscopic crystals which are readily soluble in water and ethanol and which sublime at 965 ° C.

properties

The anhydrous nickel (II) bromide is a yellow to bronze-yellow, strongly hygroscopic salt. When water gets in, it changes into the trihydrate NiBr ₂ · 3 H ₂ O. There is also a green hexahydrate that turns into the trihydrate at 28.5 ° C. The yellow-green trihydrate changes into the anhydrate at 200 ° C. The existence of a light green nona (melting point −2.5 ° C) and an octahydrate is also assumed.

Nickel (II) bromide hexahydrate

Sublimated products of anhydrous nickel (II) bromide have a crystal structure of the cadmium chloride type with the space group R 3 m (space group no. 160) (a = 3.708, c = 18.300 Å ), non- sublimated products have an alternating structure of cadmium hydroxide and cadmium chloride -Type. Template: room group / 160

In the gaseous state, nickel (II) bromide is present as a monomeric molecule. When heated in air it turns into nickel (II) oxide and bromine.

Presentation and extraction

Nickel (II) bromide can be produced by the action of bromine on heated nickel .

{\ displaystyle \ mathrm {Ni + Br_ {2} \ longrightarrow NiBr_ {2}}}

It is also possible to produce it by heating nickel (II) chloride in a hydrogen bromide stream to 500 ° C, by heating the hexahydrate to 140 ° C in a drying cabinet or by reacting nickel (II) acetate with acetyl bromide in benzene .

The hexahydrate can be prepared by dissolving the anhydrate in water, evaporating until crystallization, then cooling and recrystallizing from alcohol. It is also possible to obtain this from precipitated nickel (II) carbonate , nickel (II) oxide or nickel (II) hydroxide by dissolving it in aqueous hydrogen bromide, then evaporating it and recrystallizing it from alcohol.

The dihydrate can be prepared by dehydrating the hexahydrate over concentrated sulfuric acid at 5 ° C.

use

Nickel (II) bromide can be used for the production of nickel compounds (e.g. bis (triphenylphosphine) nickel (II) bromide or complex compounds such as hexaammine nickel (II) bromide ).

Individual evidence

↑ ^a ^b ^c ^d data sheet nickel (II) bromide (PDF) from Merck , accessed on December 24, 2010.
↑ webelements.com: Nickel (II) bromide
↑ ^a ^b ^c ^d ^e ^f ^g 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. 1688.
↑ ^a ^b Entry on nickel (II) bromide in the GESTIS substance database of the IFA , accessed on July 23, 2016(JavaScript required) .
↑ Entry on Nickel dibromide in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on February 1, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .
^ ^A ^b Dale L. Perry: Handbook of Inorganic Compounds, Second Edition . CRC Press, 2011, ISBN 978-1-4398-1462-8 , pp. 289 ( limited preview in Google Book search).
↑ ^a ^b R. J. Meyer: Nickel Part B - Delivery 2. Connections to Nickel-Polonium . Springer-Verlag, 2013, ISBN 978-3-662-13302-6 , pp. 601–612 ( limited preview in Google Book search).
↑ D. Nicholls: The Chemistry of Iron, Cobalt and Nickel Comprehensive Inorganic Chemistry . Elsevier, 2013, ISBN 978-1-4831-4643-0 , pp. 1127 ( limited preview in Google Book search).

Web links

The crystal structure of nickel bromide and iodide. (PDF; 487 kB)
Kazumi Yamamoto: About the high pressure synthesis of acrylic ester. I. Findings in the synthesis of acrylic esters using a nickel halide catalyst . In: Bulletin of the Chemical Society of Japan . tape 27 , no. 8 , 1954, pp. 491-495 , doi : 10.1246 / bcsj.27.491 .
University of British Columbia: Nickel bromide as a hydrogen transfer catalyst. (PDF).

[Merck-1] ta sheet nickel (II) bromide (PDF) from Merck , accessed on December 24, 2010.

[webelements-2] webelements.com: Nickel (II) bromide

[brauer-3] ↑ ^a ^b ^c ^d ^e ^f ^g 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. 1688.

[GESTIS-4] Entry on nickel (II) bromide in the GESTIS substance database of the IFA , accessed on July 23, 2016(JavaScript required) .

[CLP_100.033.318-5] Entry on Nickel dibromide in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on February 1, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .

[Dale_L._Perry-6] A ^b Dale L. Perry: Handbook of Inorganic Compounds, Second Edition . CRC Press, 2011, ISBN 978-1-4398-1462-8 , pp. 289 ( limited preview in Google Book search).

[R._J._Meyer-7] R. J. Meyer: Nickel Part B - Delivery 2. Connections to Nickel-Polonium . Springer-Verlag, 2013, ISBN 978-3-662-13302-6 , pp. 601–612 ( limited preview in Google Book search).

[D._Nicholls-8] D. Nicholls: The Chemistry of Iron, Cobalt and Nickel Comprehensive Inorganic Chemistry . Elsevier, 2013, ISBN 978-1-4831-4643-0 , pp. 1127 ( limited preview in Google Book search).