Ruthenium (III) bromide

Crystal structure
	__ Ru 3+ __ Br -
Crystal system	orthorhombic
Space group	Pmmn (No. 59)
Lattice parameters	a = 1126 pm, b = 587 pm, c = 650 pm
General
Surname	Ruthenium (III) bromide
other names	Ruthenium tribromide
Ratio formula	RuBr 3
Brief description	black solid
External identifiers / databases
EC number	237-829-4
ECHA InfoCard	100.034.377
PubChem	176290
ChemSpider	75924
Wikidata	Q4096894
properties
Molar mass	340.78 g mol −1
Physical state	firmly
density	5.3 g cm −3 (20 ° C)
Melting point	500 ° C (decomposition)
solubility	almost insoluble in water
safety instructions
GHS labeling of hazardous substances danger
H and P phrases	H: 314
	P: 280-301 + 330 + 331-305 + 351 + 338
Thermodynamic properties
ΔH f 0	−184 kJ mol −1
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Ruthenium (III) bromide is a chemical compound of ruthenium and is one of the bromides . It is a black, crystalline solid.

Extraction and presentation

Ruthenium (III) bromide can be obtained directly from the elements at temperatures of 450 ° C and increased pressure.

{\ displaystyle {\ ce {2Ru + 3Br2 -> 2RuBr3}}}

An alternative is the reaction of ruthenium (VIII) oxide with hydrogen bromide .

properties

Ruthenium (III) bromide crystallizes in two different structures that merge at 383 K. Above this temperature the compound crystallizes in a hexagonal structure in the space group P 6 ₃ / mcm (space group no. 193) with the lattice parameters a = 652 pm and c = 589 pm as well as two formula units per unit cell . Template: room group / 193

Below 383 K, this structure is orthorhombically distorted and now occurs in the space group Pmmn (No. 59) with the lattice parameters a = 1126 pm, b = 587 pm and c = 650 pm as well as four formula units per unit cell. Long chains of face-sharing octahedra form in both structures; the distortion is caused by the formation of pairs of two ruthenium atoms. Template: room group / 59

Individual evidence

^ ^A ^b H. Hillebrecht, Th. Ludwig, G. Thiele: About Trihalides with TiI ₃ Chain Structure . Proof of Pair Forming of Cations in -RuCl ₃ and RuBr ₃ by Temperature Dependent Single Crystal X-ray Analyzes. In: Journal of Inorganic and General Chemistry . tape 630 , 2004, pp. 2199-2204 , doi : 10.1002 / zaac.200400106 .
↑ ^a ^b ^c ^d ^e data sheet ruthenium (III) bromide, Ru 29% min from AlfaAesar, accessed on December 7, 2019 ( PDF )(JavaScript required) .
↑ ruthenium (III) bromide at webelements.com
^ AF Holleman , N. Wiberg : Inorganische Chemie . 103rd edition. Volume 2: Subgroup elements, lanthanoids, actinides, transactinides. Walter de Gruyter, Berlin / Boston 2016, ISBN 978-3-11-049590-4 , p. 1975 (reading sample: Part C - Subgroup elements. Google book search ).
↑ K. Brodersen, H.-K. Breitbach, G. Thiele: The fine structure of ruthenium (III) bromide . In: Journal of Inorganic and General Chemistry . tape 357 , no. 4-5 , 1967, pp. 162-171 , doi : 10.1002 / zaac.19683570402 .
^ AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 102nd edition. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1 , p. 1671.

[kristalldaten-1] A ^b H. Hillebrecht, Th. Ludwig, G. Thiele: About Trihalides with TiI ₃ Chain Structure . Proof of Pair Forming of Cations in -RuCl ₃ and RuBr ₃ by Temperature Dependent Single Crystal X-ray Analyzes. In: Journal of Inorganic and General Chemistry . tape 630 , 2004, pp. 2199-2204 , doi : 10.1002 / zaac.200400106 .

[Alfa-2] ↑ ^a ^b ^c ^d ^e data sheet ruthenium (III) bromide, Ru 29% min from AlfaAesar, accessed on December 7, 2019 ( PDF )(JavaScript required) .

[webelements-3] ruthenium (III) bromide at webelements.com

[4] AF Holleman , N. Wiberg : Inorganische Chemie . 103rd edition. Volume 2: Subgroup elements, lanthanoids, actinides, transactinides. Walter de Gruyter, Berlin / Boston 2016, ISBN 978-3-11-049590-4 , p. 1975 (reading sample: Part C - Subgroup elements. Google book search ).

[5] K. Brodersen, H.-K. Breitbach, G. Thiele: The fine structure of ruthenium (III) bromide . In: Journal of Inorganic and General Chemistry . tape 357 , no. 4-5 , 1967, pp. 162-171 , doi : 10.1002 / zaac.19683570402 .

[HoWi-6] AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 102nd edition. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1 , p. 1671.