Molybdenum(III) bromide

Molybdenum(III) bromide

Names
IUPAC names Molybdenum(III) bromide Molybdenum tribromide
Identifiers
CAS Number	13446-57-6 Y
ChemSpider	75310
ECHA InfoCard	100.033.259
EC Number	236-600-6
PubChem CID	83472
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
Properties
Chemical formula	MoBr3
Molar mass	335.70 g/mol
Appearance	dark green to black solid
Density	4.89 g/cm3
Melting point	500 °C (932 °F; 773 K) (decomposes)
Solubility in water	insoluble
Solubility	soluble in pyridine
Magnetic susceptibility (χ)	+525.0·10−6 cm3/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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]

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.^[2][3] 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. ↑ 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.
3. ↑ 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