Tantalum(V) bromide

Tantalum(V) bromide

Tantalum(V) bromide
Names
Other names tantalum pentabromide
Identifiers
CAS Number	13451-11-1 TaBr5 17786-61-7 Ta2Br10
EC Number	236-618-4
Jmol 3D model	Interactive image
PubChem	83480
InChI InChI=1S/5BrH.Ta/h5*1H;/q;;;;;+5/p-5
SMILES Br[Ta](Br)(Br)(Br)Br
Properties
Chemical formula	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)
Vapor pressure	{{{value}}}
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. 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.

Preparation and handling

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.