CeCrOS 2 is monoclinic, space group B2/m, with unit-cell constants a = 11.518 (6), b = 7.951 (4), c = 3.703 (4) A, y = 90.07 (6) °, z = 4, O m : 5.4 (1), D x = 5-33 Mg m -3. The crystal structure has been determined from four-circle diffractometer data using Patterson and Fourier syntheses and refined by the least-squares method to a final R value of 0.025 for 778 observed structure factors. The Ce atom is nine-coordinated in tricapped trigonal prisms containing three O and six S atoms; the Cr atom is six-coordinated in two types of octahedra: [CrS 6] and [CRO254]. The structure shows a three-dimensional arrangement and can be regarded as being built up from layers of [CeO3S 6] polyhedra alternating with layers of [CrOSs I octahedra.

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