NH4Ag3(PO3F)2, a layered monofluorophosphate(V) with seven different Ag sites

Single crystals of ammonium trisilver bisfluorophosphate(V)], NH₄Ag₃(PO₃F)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 PO₃F tetrahedra and two ammonium cations. The layered structure is composed of silver–monofluorophosphate sheets, Ag₃(PO₃F)₂]⁻, that extend parallel to (100). The F atoms of the PO₃F 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.