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In chemistry, the perbromate ion is the anion with the chemical formula . It is an oxyanion of bromine, the conjugate base of perbromic acid, in which bromine has the oxidation state +7. (2025). 9780123526519, Academic Press. ISBN 9780123526519 Unlike its chlorine () and iodine () analogs, it is difficult to synthesize. It has tetrahedral molecular geometry.
The term perbromate also refers to a compound that contains the anion or the functional group.
The perbromate ion is a strong oxidizing agent. The reduction potential for the /bromide couple is +0.68 V at pH 14. This is comparable to selenite's reduction potential.
Subsequently, it was successfully synthesized again by the electrolysis of , although only in low yield.
(2025). 9780748764204, CRC Press. ISBN 9780748764204 Later, it was obtained by the oxidation of bromate with xenon difluoride. (2025). 9780123526519, Academic Press. ISBN 9780123526519 Once perbromates are obtained, perbromic acid can be produced by protonating .
One effective method of producing perbromate is by the oxidation of bromate with fluorine under alkaline conditions:
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. The reaction (and its perchlorate analogue) occurs naturally, but very slowly, requiring several days to complete.
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