Molybdenum(III) bromide
{{chembox
| verifiedrevid = 428807101
| Name = Molybdenum(III) bromide
| ImageFile1 = MoBr3sideview.jpg
| ImageFile2 = MoBr3endview.jpg
| ImageSize =
| ImageName = Molybdenum(III) bromide
| IUPACName = Molybdenum(III) bromide
| OtherNames = Molybdenum tribromide
|Section1={{Chembox Identifiers
| CASNo = 13446-57-6
| CASNo_Ref = {{cascite|correct|CAS}}
| RTECS =
| PubChem = 83472
| EINECS = 236-600-6
| SMILES = Br[Mo](Br)Br
| ChemSpiderID = 75310
| InChI = 1/3BrH.Mo/h3*1H;/q;;;+3/p-3
| InChIKey = YPFBRNLUIFQCQL-DFZHHIFOAV
| StdInChI = 1S/3BrH.Mo/h3*1H;/q;;;+3/p-3
| StdInChIKey = YPFBRNLUIFQCQL-UHFFFAOYSA-K
}}
|Section2={{Chembox Properties
| Formula = MoBr3
| MolarMass = 335.70 g/mol
| Appearance = dark green to black solid
| Density = 4.89 g/cm3
| Solubility = insoluble
| SolubleOther = soluble in pyridine
| MeltingPtC = 500
| MeltingPt_notes = (decomposes)
| BoilingPtC =
| MagSus = +525.0·10−6 cm3/mol
}}
|Section3={{Chembox Structure
| Coordination =
| CrystalStruct =
| Dipole =
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|Section7={{Chembox Hazards
| ExternalSDS =
| MainHazards =
| FlashPt =
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|Section8={{Chembox Related
| OtherAnions = Molybdenum(III) chloride
Molybdenum(III) iodide
| OtherCompounds = Molybdenum(II) bromide
}}
}}
Molybdenum(III) bromide is the inorganic compound with the formula MoBr3. It is a black solid that is insoluble in most solvents but dissolves in donor solvents such as pyridine.
Preparation
Molybdenum(III) bromide is produced by the reaction of elemental molybdenum and bromine at {{convert|350|C|F}}.F. Hein, S. Herzog "Molybdenum(III) Bromide" in Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 1407.
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It can also be prepared from the reduction of molybdenum(IV) bromide with molybdenum metal, hydrogen gas, or a hydrocarbon.{{Cite book|last=Perry|first=Dale L.|title=Handbook of Inorganic Compounds|publisher=Taylor & Francis|year=2011|isbn=978-1-4398-1461-1|edition=2nd|location=Boca Raton|pages=279}}
It has a structure consisting of infinite chains of face-sharing octahedra with alternatingly short and long Mo-Mo contacts. The same structure is adopted by the tribromides of ruthenium and technetium.Dietrich Babel: Die Verfeinerung der MoBr3-Struktur (Refinement of the MoBr3-Structure) In: Journal of Solid State Chemistry. 1972, volume 4, S. 410–416, {{doi|10.1016/0022-4596(72)90156-9}}.Order-Disorder Transformation in RuBr3 and MoBr3: A two-Dimensional Ising Model" Merlino, S.; Labella, L.; Marchetti, F.; Toscani, S. Chemistry of Materials 2004, volume 16, p3895-p3903 In contrast, in the high temperature phase of titanium(III) iodide, the Ti---Ti separation is invariant.
References
{{Molybdenum compounds}}
{{bromides}}