Synthese und Struktur der ternären Ammoniumnitrate (NH4)2[M(NO3)5] (M = Tb?Lu,Y

Synthesis and Structure of the Ternary Ammonium Nitrates (NH₄)₂M(NO₃)₅] (M = Tb? Lu, Y) Single crystals of the ternary ammonium nitrates (NH₄)₂M(NO₃)₅] (M = Tb? Lu, Y) are obtained from the solution of the sesquioxides in a melt of NH₄NO₃ and sublimation of the excess NH₄NO₃. In the crystal structure of (NH₄)₂Tm(NO₃)₅] (trigonal, P3₁, Z = 3; a = 1 123.76(8), c = 930.1(1) pm; R = 0.062; R_w = 0.034) Tm³⁺ is surrounded by five bidentate nitrate ligands. The isolated Tm(NO₃)₅]^2? groups are held together by ammonium ions.