Perbromate ion

The crystal structure of potassium perbromate has been determined, and it was found that the perbromate ion is tetrahedral as expected from the isoelectronic ClO, JO, and Xe04 species. 

The best known exceptions to the general reluctance of bromine to accept a + 7 oxidation stale are perbroinic acid and the perbromate ion, which were unknown prior to 1968 (see Chapter 17). Their subsequent synthesis has made their nonexistence" somewhat less crucial as a topic of immediate concern to inorganic chemists, but bromine certainly continues the trend started by arsenic and selenium Thus the perbromate ion is a stronger oxidizing agent than either perchlorate or periodate. 

The synthesis of HBr04 and rubidium and potassium salts was accomplished, using oxidation of bromate by XeF2 or (preferably) molecular fluorine in aqueous solution.19 Spectral studies20 show that the perbromate ion is tetrahedral in both the solid-state and aqueous solutions. The thermodynamic properties and thermal decomposition of individual salts are discussed under each element. A more general article on various properties of the perbromates was published by Herrell and Gayer.21... 

It should be emphasized that the failure to isolate a compound by a particular synthetic procedure is not a legitimate criterion for the molecule s stability. This error in reasoning has a long history in chemistry (cf. the instability of the noble gas halides or the perbromate ion) and also occurs in the metallocene literature. 

The names are bromide ion, bromate ion, bromite ion, hypobromite ion, and perbromate ion. 

Perbromate ions have been extracted into chlorobenzene as ion-associates with Crystal Violet [31], or with Brilliant Green [32]. The analytical properties of perbromate (Br04 ), have been compared with the properties of perchlorate and periodate ions [33]. Chromatographic and electrophoretic methods have been developed for the separation of perbromate from other halogen compounds [34]. 

Perbromyl fluoride, FBrOs, is made by fluo-rinating the corresponding perbromate ion with AsFj, SbFj, BrFj or [BrF6] [AsF6] in HF solutions. The reactions are smooth and quantitative at room temperature ... 

The best method of preparation of perbromate ion is by reaction 16.73. Cation exchange (see Section 10.6) can be used to give HBr04, but the anhydrous acid has not been isolated. 

Despite many attempts, the perbromate ion (Br04 ) was not prepared in the laboratory until about 1970. (Indeed, articles were published explaining theoretically why it could never be prepared ) Draw a Lewis structure for Br04 in which all atoms have the lowest formal charges. 

The second-order rate constant for this process was determined. A polaro-graphic study of the reduction of perbromate ion at mercury has confirmed that the reaction rate is not affected by hydrogen ion concentration for pH values less than 12. These authors were able also to investigate the effect of the double-layer structure upon BrO electroreduction. 

Name the anion obtained by removing one oxygen atom from the perbromate ion, Br04. ... 

Figure 2.24 Removing one O atom from the perbromate ion gives the hromate ion, Br03. ...

Although the 004 and 104 ions have been known for a long time, Br04 was not synthesized until 1965. The ion was synthesized by oxidizing the bromate ion with xenon difluoride, producing xenon, hydrofluoric acid, and the perbromate ion. (a) Write the balanced equation for this reaction, (b) What are the oxidation states of Br in the Br-containing species in this reaction ... 

Bromine.— The reaction mechanisms of a relatively new species, the perbromate ion, are currently under investigation. The redox reactions with a number of reductants have been studied, and in reactions with sulphite and arsenite it... 

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