The Role of Prussian Blue-Thallium and Potassium Similarities and Differences in Crystal Structures of Selected Cyanido Complexes of W, Fe and Mo

The synthesis and single X-ray crystal structures of Tl-2[W(CN)(6)(bpy)]center dot H2O, Tl[W(CN)(6)(bpy)], Tl-57[{Fe(CN)(6)}(12){NO3}(9)]center dot 9H(2)O, Tl-4[W(CN)(8)] and Tl-4[Mo(CN)(8)] are described. Salts crystalize in the monoclinic or trigonal (Fe) space group. For all complexes, the very unusual side-on coordination of Tl to C and N of cyanido ligands is observed and compared to potassium cations. The very strong bonding to cyanido ligands with an 8-13 coordination number of thallium is described and discussed. The difference between potassium and thallium bonding is an indication of the biological activity of thallium and the role of Prussian blue in the thallium detoxification procedure.

Automated summary

The synthesis and crystal structures of Tl-2[W(CN)(6)(bpy)]·H2O, Tl[W(CN)(6)(bpy)], Tl-57[{Fe(CN)(6)}(12){NO3}(9)]·9H(2)O, Tl-4[W(CN)(8)], and Tl-4[Mo(CN)(8)] are described in this paper. The coordination of Tl to the C and N of the cyanido ligands in a side-on manner is observed, which is highly unusual and is compared to the coordination of potassium cations. The strong bonding between thallium and cyanido ligands with an 8-13 coordination number is discussed, along with the biological activity of thallium and the role of Prussian blue in thallium detoxification.