Synthesis and structures of chloride thiosilicates with lanthanides Ln3Cl[SiS4]2 (Ln = La, Ce, Pr)

Single crystals of Ln3Cl[SiS4]2 (Ln=La, Ce, Pr) were prepared by the reaction of lanthanide metal, sulfur, silicon and chlorine. Data collection was carried out using a STOE imaging plate detector at 293 K. The homologue compounds crystallize in the space group C2/c of the monoclinic system isotypically to Ln3X[SiS4]2 (X=Br, I) and the A-type of the halide oxosilicates Ln3X[SiO4]2 (X=Cl, Br; Ln=La, Ce, Pr) with four formula units in cells of dimensions:• SiS4]2: a=1567.2(3) pm, b=777.8(2) pm, c=1101.5(2) pm, β=96.88(2)° SiS4]2: a=1559.4(3) pm, b=770.2(2) pm, c=1096.9(2) pm, β=97.07(2)° SiS4]2: a=1555.9(3) pm, b=764.2(1) pm, c=1093.2(2) pm, β=97.40(2)° orresponding residuals (all data) for the refined structures are 2.28% (La), 2.15% (Ce), and 3.17% (Pr), respectively. In the crystal structures, the chloride ions form chains along [0 0 1] with trigonal coordination by the lanthanide ions.