Niobium(V) bromide
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| Other names
niobium pentabromide
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| Identifiers | |
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3D model (JSmol)
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| ChemSpider | |
| ECHA InfoCard | 100.033.420 |
| EC Number |
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PubChem CID
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CompTox Dashboard (EPA)
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| 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] | |
 
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| 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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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.
Synthesis
[edit]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
[edit]- ^ "Niobium(V) bromide". pubchem.ncbi.nlm.nih.gov. Retrieved 28 December 2021.
- ^ 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. Vol. 1. NY, NY: Academic Press. p. 1311.