Synthesis, Single-crystal Structure and Raman Spectrum of Cu[N(CN)2]2 2 NH3

Transparent blue crystals of Cu[N(CN)2]2 · 2 NH3 were obtained by blending solutions of Na[N(CN)2] and Cu(NO3)2 · 2.5 H2O in aqueous ammonia and subsequent evaporation of the solvent under ambient conditions. Cu[N(CN)2]2 · 2 NH3 crystallizes in space group P1 (no. 2, Z = 2) with the cell parameters a = 746.1(4), b = 747.8(4) and c = 894.4(5) pm, and the angles α = 68.94(2), β = 75.52(1) and γ = 68.22(4)◦. The presence of the dicyanamide anion and the ammonia molecules was verified by Raman spectroscopy.