Figure 16.

(a) NRVS for Prussian blue (PB) (black), K₂[MgFe(II)(CN)₆] (blue), and KFe(II)Co(III)(CN)₆ (red); (b) structure of PB where red = Fe(III), yellowish green = Fe(II), black = C, blue = N, and purple = H₂O; (c) iron clusters inside an FeFe hydrogenase in Figure 2a: the green shaded region is the [2Fe]H sub-cluster, while (c1) is the H-cluster; the rest are the proximal (c2), median (c4), and distal (c5) [4Fe4S] clusters and the [2Fe2S] cluster (c3). The brown atoms are iron, while the yellow ones are sulfur.