We investigate computationally two representative examples of higher
fluorides of Ag(II), namely KAgF₃ and AgFBF₄. Both compounds formally
contain linear (Ag-F)⁺ chains in which divalent silver is coordinated
additionally by four fluoride anions. For AgFBF₄, the equatorial
coordination is weak, and leads to metallic conductivity in 1D, as comes
out from our band structure calculations. For KAgF₃, however, the axial
coordination is very strong, and the compound is virtually a 2D metal
(i.e. mainly the x²-y² orbitals of Ag participate in electronic transport
in this interesting material). The fluoroargentates are thus unique
examples of conducting fluorides, as first predicted by theory
(W.Grochala, R.Hoffmann, Angew. Chem. Int. Ed. Engl. 40(15): 2743-2781
2001).

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