Molybdenum(III) bromide

Molybdenum(III) bromide

Names
IUPAC name Molybdenum(III) bromide
Other names Molybdenum tribromide
Identifiers
CAS Number	13446-57-6^Y
3D model (JSmol)	Interactive image
ChemSpider	75310
ECHA InfoCard	100.033.259
EC Number	236-600-6
PubChem CID	83472
CompTox Dashboard (EPA)	DTXSID2065462
InChI InChI=1S/3BrH.Mo/h3*1H;/q;;;+3/p-3 Key: YPFBRNLUIFQCQL-UHFFFAOYSA-K InChI=1/3BrH.Mo/h3*1H;/q;;;+3/p-3 Key: YPFBRNLUIFQCQL-DFZHHIFOAV
SMILES Br[Mo](Br)Br
Properties
Chemical formula	MoBr3
Molar mass	335.70 g/mol
Appearance	dark green to black solid
Density	4.89 g/cm^3
Melting point	500 °C (932 °F; 773 K) (decomposes)
Solubility in water	insoluble
Solubility	soluble in pyridine
Magnetic susceptibility (χ)	+525.0·10^−6 cm^3/mol
Related compounds
Other anions	Molybdenum(III) chloride Molybdenum(III) iodide
Related compounds	Molybdenum(II) bromide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is ^YN ?) Infobox references

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 350 °C (662 °F).^[1]

${\displaystyle \mathrm {2\ Mo+3\ Br_{2}\longrightarrow 2\ MoBr_{3}} }$

It can also be prepared from the reduction of molybdenum(IV) bromide with molybdenum metal, hydrogen gas, or a hydrocarbon.^[2]

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.^[3][4] In contrast, in the high temperature phase of titanium(III) iodide, the Ti---Ti separation is invariant.

References

1. 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.
2. Perry, Dale L. (2011). Handbook of Inorganic Compounds (2nd ed.). Boca Raton: Taylor & Francis. p. 279. ISBN 978-1-4398-1461-1.
3. 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.
4. 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