Reactions Involving Chalcogeno Mo and W Clusters

Polyoxohomopolymetalates. The brilliant tungsten bronzes , with x l in (M )j/h(W03), from high-temperature reductions of the Aik, Ae , or Ln tungstates and WO3, are insoluble even in hot, concentrated, strong acids and bases. Similar compounds of Mo are less stable. 

We may note in passing that the common statement that the rate is slow confuses the (low) rate, an abstraction of the process, with the (slow) physical process itself Either the rate is low or the process is slow would be unambiguous. 

A trae equation for this, starting with the heptamolybdate, is formidable (albeit presentable) because the 7 does not divide evenly into the other subscripts. Let us note the mathematieal equivalenees and near equivalenee in the following, and the fact that chemical reaction does provide small amoimts of HM0O4 at arty instant  

although Nature can handle large numbers that we may choose to cut down, we can write the still complicated equation, similar to, but more faithful to the species actually present than, the original [2]  

From this and HPH2O2 can be made very similar dark-brown crystals, 

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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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