Abstract: | BaAg2S2, a Thioargentate with the CaAl2Si2-Type Structure BaAg2S2 could be obtained as crystalline powder by the reaction of barium-bisdicyanoargentate(I)] in a stream of hydrogensulfid at 500°C. Single crystals grew at 480°C in an evacuated glass ampoule filled with a flux of potassium thiocyanate and powdery BaAg2S2 as solid. BaAg2S2 crystallises in the trigonal CaAl2Si2-typ structure, a = 4.386(1) Å, c = 7.194(2) Å, space group P3 m1, Z = 1. The structure was determined from four-circle diffractometer data. The silver-sulphur distances are discussed with respect to the corresponding distances of the hitherto known alkaline earth-transition metal pnictides, also crystallizing in the CaAl2Si2-typ structure. |