Syntheses and crystal structures of (Ag₄XO₄)₂·AgNO₃(X = Si, Ge)

Abstract

Ag4X0 4 ) 2 · AgN0 3 (X = Si, Ge) was formed upon heating the component binary oxides in the presence of excess AgN0 3 at 360 -400° C. Decomposition of Ag 2 0 was suppressed by applying high oxygen pressure . The new compounds are isostructural, Pi, a = 576.8(1), b = 676.8(1), c = 884.3(1) pm, α = 107.03(1)°, β = 99.87(1)°, γ = 94.16(1)° and a = 589.4(1), b = 684.3(2), c = 885.0(2) pm,a = 106,28(2)°, β = 98.94(2)°, y = 95.83(2)°. The structures have been solved, using 2850 and 3196 independent reflections, with final R-values of 0.059 and 0.060 for the silicate and germanate respectively. The silver atoms form particular arrangements with shortest Ag + -Ag + separations, which are only slightly larger than those in metallic silver. The mean values of the silver-silver distances under consideration do not differ significantly for both substances.Brought to you by | University of California Authenticated Download Date | 6/8/15 8:07 AM