Röntgenstrukturanalysen an Einkristallen von Ce2S3 im A- und C-Typ

X-Ray Structure Analyses for Single Crystals of A- and C-type Ce2S3 Dark red, lath-shaped single crystals of A-type Ce2S3 (orthorhombic, Pnma, a = 753.23(6), b = 409.67(3), c = 1572.76(9) pm, Vm = 73.065(8) cm3/mol, Z = 4) are obtained along with deep red, bead-shaped single crystals of C-type Ce2S3 (cubic, I 4 3d, a = 865.24(5) pm, Vm = 73.140(7) cm3/mol, Z = 5.333) and cinnabar (α-HgS) during unsuccessful efforts to synthesize HgCe2S4 by the oxidation of mercury and cerium metal with sulfur (molar ratio 1 : 2 : 4) in evacuated silica tubes at 400 °C in the presence of a fluxing KCl–LiCl mixture within seven days. Their crystal structures belong to the α-Gd2S3- (A type) or a cation-deficient Th3P4-type family (C type) according to M2.667□0.333S4 (Z = 4) or M2S3 (Z = 5.333), respectively, offering coordination numbers of seven and eight (S2– arranged as mono- or bicapped trigonal prisms in A-Ce2S3) or eight only (S2– arranged as trigonal dodecahedra in C-Ce2S3) to the Ce3+ cations.