Tantalum(V) bromide

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Tantalum(V) bromide
Tantalum(V) bromide
Names
Other names
tantalum pentabromide
Identifiers
13451-11-1 TaBr5
17786-61-7 Ta2Br10
3D model (Jmol) Interactive image
ECHA InfoCard 100.033.276
EC Number 236-618-4
PubChem 83480
Properties
Ta2Br10
Molar mass 580.468 g/mol
Appearance yellow solid
Density 4.99 g/cm³, solid
Melting point 265 °C (509 °F; 538 K)
Boiling point 349 °C (660 °F; 622 K)
Hazards
not listed
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

Tantalum(V) bromide is the inorganic compound with the formula Ta2Br10.[1] It is a diamagnetic yellow solid that hydrolyses readily. The compound adopts an edge-shared bioctahedral structure, which means that two square pyramidal TaBr5 subunits are joined by a pair of bridging bromide ligands. The pentachlorides and pentaiodides of Nb and Ta share this structural motif.[2]

Preparation and handling[edit]

The material is usually prepared by the reaction of bromine with tantalum metal (or tantalum carbide) at elevated temperatures in a tube furnace. The bromides of the early metals are sometimes preferred to the chlorides because of the relative ease of handling liquid bromine vs gaseous chlorine. Like other molecular halides, it is soluble in nonpolar solvents such as carbon tetrachloride (1.465 g/100 mL at 30 °C), but it reacts with many other solvents.[3]

References[edit]

  1. ^ Greenwood, N. N.; & Earnshaw, A. Chemistry of the Elements (2nd Edn.), 1997, Oxford:Butterworth-Heinemann. ISBN 0-7506-3365-4.
  2. ^ K. Habermehl, I. Pantenburg, G. Meyer "Redetermination of Tantalum Pentabromide, (TaBr5)2" Acta Crystallogr. 2010, E66, i67. doi:10.1107/S1600536810032538
  3. ^ D. H. Nowicki, I. E. Campbell "Tantalum(V) Bromide" Inorganic Syntheses 1953, volume IV, p. 130. doi:10.1002/9780470132357.ch44