In chemistry, the perbromate ion is the anion having the chemical formula BrO−
4. It is an oxyanion of bromine, the conjugate base of perbromic acid, in which bromine has the oxidation state +7. Unlike its chlorine and iodine analogs (perchlorate and periodate), it is difficult to synthesize. It has tetrahedral molecular geometry.
The term perbromate also refers to a compound that contains the BrO−
4 anion or the –OBrO
3 functional group.
- 83SeO42− → 83BrO4− + β−
Subsequently, it was successfully synthesized again by the electrolysis of LiBrO
3, although only in low yield. Later, it was obtained by the oxidation of bromate with xenon difluoride. Once perbromates are obtained, perbromic acid can be produced by protonating BrO−
3 + F
2 + 2 OH−
4 + 2 F−
This synthesis is much easier to perform on a large scale than the electrolysis route or oxidation by xenon difluoride.
In 2011 a new, more effective synthesis was discovered: perbromate ions were formed through the reaction of hypobromite and bromate ions in an alkaline sodium hypobromite solution.
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