Niobiumv Bromide
Niobium(V) bromide is the inorganic compound with the formula Nb2Br10.
Its name comes from the compound's empirical formula, NbBr5. 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. Niobium(V) chloride, niobium(V) iodide, tantalum(V) chloride, tantalum(V) bromide, and tantalum(V) iodide all share this structural motif.
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| Names | |
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| Other names niobium pentabromide | |
| Identifiers | |
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3D model (JSmol) | |
| ChemSpider | |
| ECHA InfoCard | 100.033.420 |
| EC Number |
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PubChem CID | |
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: | |
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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). | |
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:
- Nb2O5 + 3.3 AlBr3 → 2 NbBr5 + 3.3 Al2O3
A challenge with the latter method is the occurrence of NbOBr3 as an impurity.
References
External links
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