Low-coordinate soft metals can, in the right stoichiometry, form 1D structures with thiocyanate and alkali metals (Fig. ). Rb 2 [Ag(SCN) 3 ] comprises a 1D chain of corner-sharing AgS 4 tetrahedra. Similarly, Rb[Hg(SCN) 3 ] consists of chain of corner sharing HgS 4 tetrahedra connected through the S-atom of the NCS -ligand. Cs[Hg(SCN) 3 ] also has a chain structure of tetrahedra, but in this case, the tetrahedra edge-share through S to form Hg 2 S 6 N) 2 dimers, which are connected through the length of thiocyanate to form extended 1D connectivity. The isostructural family M[Au(SCN) 2 ] M = K, Rb, Cs, have an very different kind of chain structure, comprising linearly coordinated Au(I) anions [Au(SCN) 2 ] -stacked and connected by