Niobium(V) bromide

Niobium(V) bromide is the inorganic compound with the formula Nb2Br10. Its name comes from the compound's empirical formula, NbBr5.[2] It is a diamagnetic, orange solid that hydrolyses readily. The compound adopts an edge-shared bioctahedral structure, which means that two NbBr5 units are joined by a pair of bromide bridges. There is no bond between the Nb centres.[3] Niobium(V) chloride, niobium(V) iodide, tantalum(V) chloride, tantalum(V) bromide, and tantalum(V) iodide all share this structural motif.

Niobium(V) bromide
Names
Other names
niobium pentabromide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.420
EC Number
  • 236-778-5
  • InChI=1S/5BrH.Nb/h5*1H;/q;;;;;+5/p-5 checkY
    Key: DSYRJFDOOSKABR-UHFFFAOYSA-I checkY
  • InChI=1/5BrH.Nb/h5*1H;/q;;;;;+5/p-5
    Key: DSYRJFDOOSKABR-AACRGIKGAJ
  • [Br-].[Br-].[Br-].[Br-].[Br-].[Nb+5]
Properties
NbBr5
Molar mass 492.430 g/mol
Appearance wine red to black crystals
Density 4.417 g/cm3
Melting point 254 °C (489 °F; 527 K)
Boiling point 364 °C (687 °F; 637 K)
hydrolysis
Structure
orthorhombic
Hazards
GHS labelling:[1]
GHS05: CorrosiveGHS07: Exclamation mark
Danger
H302, H312, H314, H332
P260, P261, P264, P270, P271, P280, P301+P312, P301+P330+P331, P302+P352, P303+P361+P353, P304+P312, P304+P340, P305+P351+P338, P310, P312, P321, P322, P330, P363, P405, P501
Safety data sheet (SDS) MSDS
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

Synthesis

Niobium(V) bromide can be prepared by the reaction of bromine with niobium metal at 230-250 °C in a tube furnace. It can also be produced from the more accessible oxide by metathesis using aluminium tribromide:[4]

Nb2O5 + 3.3 AlBr3 → 2 NbBr5 + 3.3 Al2O3

A challenge with the latter method is the occurrence of NbOBr3 as an impurity.

References
  1. "Niobium(V) bromide". pubchem.ncbi.nlm.nih.gov. Retrieved 28 December 2021.
  2. Greenwood, N. N.; & Earnshaw, A. (1997). Chemistry of the Elements (2nd Edn.), Oxford: Butterworth-Heinemann. ISBN 0-7506-3365-4.
  3. Hönle, Wolfgang; Furuseth, Sigrid; Schnering, Hans Georg von (1990). "Synthesis and Crystal Structure of Ordered, Orthorhombic α-NbBr5". Zeitschrift für Naturforschung B. 45 (7): 952–956. doi:10.1515/znb-1990-0706. S2CID 98293250.
  4. G. Brauer (1963). "Niobium(V) and Tantalum(V) Bromides". In G. Brauer (ed.). Handbook of Preparative Inorganic Chemistry, 2nd Ed. Vol. 1. NY, NY: Academic Press. p. 1311.


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