molybdenum(IV) bromide

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| OtherNames = molybdenum tetrabromide

|Section1={{Chembox Identifiers

| CASNo = 13520-59-7

| index1_label=dihydrate

| PubChem1 = 139031385

| ChemSpiderID = 9103085

| SMILES = [Br-].[Br-].[Br-].[Br-].[Mo+4]}}

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| Mo=1|Br=4

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| Appearance = black solid

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Molybdenum(IV) bromide, also known as molybdenum tetrabromide, is the inorganic compound with the formula MoBr₄. It is a black solid. MoBr₄ has been prepared by treatment of molybdenum(V) chloride with hydrogen bromide:

::2 MoCl₅ + 10 HBr → 2 MoBr₄ + 10 HCl + Br₂

The reaction proceeds via the unstable molybdenum(V) bromide, which releases bromine at room temperature.{{cite journal|doi=10.1039/DT9930000655|title=Low-Temperature Syntheses of Vanadium(III) and Molybdenum(IV) Bromides by Halide Exchange|journal= J. Chem. Soc., Dalton Trans.|issue=5|pages=655–658|year=1993|last1=Calderazzo|first1=Fausto|last2=Maichle-Mössmer|first2=Cäcilie|last3=Pampaloni|first3=Guido|last4=Strähle|first4=Joachim}}

Molybdenum(IV) bromide can also be prepared by oxidation of molybdenum(III) bromide with bromine.Georg Brauer (Hrsg.) u. a.: Handbuch der Präparativen Anorganischen Chemie. 3., umgearbeitete Auflage. Band III, Ferdinand Enke, Stuttgart 1981, {{ISBN|3-432-87823-0}}, S. 1537.