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Chemical compound From Wikipedia, the free encyclopedia
Ruthenium(III) bromide is a chemical compound of ruthenium and bromine with the formula RuBr3. It is a dark brown solid that decomposes above 400 °C.[2]
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Identifiers | |
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3D model (JSmol) |
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ChemSpider | |
ECHA InfoCard | 100.034.377 |
EC Number |
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PubChem CID |
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UNII | |
CompTox Dashboard (EPA) |
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Properties | |
RuBr3 | |
Molar mass | 340.782 g/mol |
Structure | |
orthorhombic[1] | |
Pmmn, No. 59 | |
octahedral | |
Hazards | |
GHS labelling: | |
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Danger | |
H314 | |
P260, P264, P280, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P363, P405, P501 | |
Related compounds | |
Other anions |
Ruthenium(III) chloride |
Other cations |
Rhodium(III) bromide Iron(III) bromide Molybdenum(III) bromide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Ruthenium(III) bromide can be prepared by the reaction of ruthenium metal with bromine at high temperature and pressure (720 K and 20 bar):[3]
The crystal structures of ruthenium(III) bromide contain parallel (RuBr3)∞ columns. The compound undergoes a phase transition around 384 K (111 °C) from an ordered orthorhombic structure in space group Pnmm with alternating long and short Ru-Ru distances to a disordered hexagonal TiI3-like structure in space group P63/mcm with (on average) equal Ru-Ru distances.[1] In the disordered polymorph, the Ru-Ru distances are not believed to actually be equal but appear so due to a random distribution of two distinct column conformations. Both polymorphs consist of hexagonally close-packed bromide ions.[4]
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