Reactions Involving the Prussian Blues

The acid HtlFelCNle] absorbs O2 from the air, especially when warmed, releasing HCN and depositing one kind of Prussian Blue  

Oxygen oxidizes H[Fe(CN)6] and H2[Fe(CN)6] to [Fe(CN)s] or to a Prussian Blue (see below), quite slowly and only with acids. Often-faster oxidants include H2O2,03, [S20s] CI2 and Br2. Thus  

We note that HCN is not much released from a cold solution. 

Iron(IlI)plus [Fe(CN)6] give (1) Prussian Blue, and Fe plus [Fe(CN)6] form (2) Turnbull s Blue, but these semiconducting products have identical structures, with some variability of composition. One could expect (1) F e 4[F (OSOels  

The intense color of the Prassian Bines, however, is from rapid electron exchange between Fe and Fe , so that the oxidation states cannot be distingnished well, and we may well write the formulas simply as Fe4[Fe(CN)6]3-aq and KFe[Fe(CN)6] raq. 

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Two subsections are added. One is 6.2.5 on reactions involving chalcogeno Mo and W clusters, which is subdivided further into polyoxohomopolymetalates polyoxoheteropolymetalates chalcogeno (S, Se) cuboidal clusters, general [S, Se clusters], homometallic and [S, Se clusters], heterometallic. The second added subsection is 8.1.5 on reactions involving the Prussian blues . 

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