Crystal structure of ammonium Bis(thiocyanato)argentate(I) (a redetermination)

Abstract

The crystal structure of the title compound, (NH₄)Ag(SCN)₂, has been redetermined at 295(1) K. Crystals are monoclinic, P2₁/n, a 7.207(4), b 23.84(1), c 4.014(4) Å, β 95.24(7)º, Z 4. The structure comprises two-dimensional polymeric anion layers parallel to ac, interleaved by N. . .H hydrogen-bonded ammonium cations. The silver atom is pseudo-tetrahedrally four-coordinated by terminal and triply bridging S thiocyanate groups (Ag-S, 2.469(4); 2.609-2.773(5) Å). The structure was refined to a residual of 0.051 for 550 'observed' reflections.