Niobium(V) bromide

Niobium(V) bromide
Names
	Other names niobium pentabromide
Identifiers
CAS Number	13748-45-0 NbBr5 ; 17633-68-0 Nb2Br10 ;
3D model (JSmol)	Interactive image;
ChemSpider	19388901 ;
ECHA InfoCard	100.033.420
EC Number	236-778-5;
PubChem CID	83517;
CompTox Dashboard (EPA)	DTXSID6065505 ;
	InChI InChI=1S/5BrH.Nb/h51H;/q;;;;;+5/p-5 Key: DSYRJFDOOSKABR-UHFFFAOYSA-I ; InChI=1/5BrH.Nb/h51H;/q;;;;;+5/p-5 Key: DSYRJFDOOSKABR-AACRGIKGAJ;
	SMILES [Br-].[Br-].[Br-].[Br-].[Br-].[Nb+5];
Properties
Chemical formula	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)
Solubility in water	hydrolysis
Structure
Crystal structure	orthorhombic
Hazards
Safety data sheet	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

Niobium(V) bromide is the inorganic compound with the formula Nb₂Br₁₀. Its name comes from the compound's empirical formula, NbBr₅.[1] 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.[2] Niobium(V) chloride, niobium(V) iodide, tantalum(V) chloride, tantalum(V) bromide, and tantalum(V) iodide all share this structural motif.

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:[3]

Nb₂O₅ + 3.3 AlBr₃ → 2 NbBr₅ + 3.3 Al₂O₃

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

References

Greenwood, N. N.; & Earnshaw, A. (1997). Chemistry of the Elements (2nd Edn.), Oxford: Butterworth-Heinemann. ISBN 0-7506-3365-4.
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.
G. Brauer (1963). "Niobium(V) and Tantalum(V) Bromides". In G. Brauer (ed.). Handbook of Preparative Inorganic Chemistry, 2nd Ed. 1. NY, NY: Academic Press. p. 1311.

External links

Web Elements

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[1] Greenwood, N. N.; & Earnshaw, A. (1997). Chemistry of the Elements (2nd Edn.), Oxford: Butterworth-Heinemann. ISBN 0-7506-3365-4.

[2] 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.

[3] G. Brauer (1963). "Niobium(V) and Tantalum(V) Bromides". In G. Brauer (ed.). Handbook of Preparative Inorganic Chemistry, 2nd Ed. 1. NY, NY: Academic Press. p. 1311.