title: NH4Ag3(PO3F)2, a layered monofluorophosphate(V) with seven different Ag sites.
abstract: Single crystals of ammonium trisilver bis[fluorophosphate(V)], NH(4)Ag(3)(PO(3)F)(2), were obtained from an aqueous solution and the structure was refined from a racemically twinned crystal. The asymmetric unit contains seven crystallographically distinct Ag atoms (two of which are located on twofold axes), four PO(3)F tetrahedra and two ammonium cations. The layered structure is composed of silver-monofluorophosphate sheets, [Ag(3)(PO(3)F)(2)]-, that extend parallel to (100). The F atoms of the PO(3)F tetrahedra point towards the ammonium cations, which are located in the interlayer space and stabilize the structure via moderate N-H...O and N-H...F hydrogen bonds.
authors.affiliation: Institute for Chemical Technologies and Analytics, Division of Structural Chemistry, Vienna University of Technology, Getreidemarkt 9/164-SC, A-1060 Vienna, Austria. mweil@mail.zserv.tuwien.ac.at
authors.forename: Matthias
authors.initials: M
authors.lastname: Weil