How do electrons travel in unusual metallic fluorides of Ag2+?

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 ID, as emerges from our band structure calculations. For KAgF3, however, the axial coordination is very strong, and the compound is virtually a 2D metal (i.e. it is mainly the x(2)-y(2) orbitals of Ag that participate in electronic transport in this interesting material). (C) 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.