Prussian blue compounds blocks

Extending this approach, using hexacyanometalate building blocks together with divalent transition metal complexes containing labile positions has afforded a variety of one-, two- and three-dimensional compounds with very different physical properties from those of the face-centred Prussian blues [20-22],... 

Since Prussian blue chemistry is currently enjoying an active revival, several groups are exploring the closely related octacyanometalate building block [M(CN)8]", where M is a transition metal ion, for the self-assembly of novel supramolecular coordination compounds [20,68]. 

The use of octahedral building blocks is perhaps one of the most obvious and simplest strategies for the assembly of molecule-based three-dimensional solids. In this context, an examination of suitable octahedral [MLg] precursors reveals that some of the most inert are the hexacyano-metalate anions [M (CN)6] " (M = Cr, Mn, Fe, Co), which can be combined with divalent Lewis acids M (M = Cu, Ni, Co, Fe, Mn) to give face-centered cubic compounds closely related to Prussian blue (Figure 3). 

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