RbCeS2 is Caswellsilverite structured and crystallizes in the trigonal R-3m space group. Rb(1) is bonded to six equivalent S(1) atoms to form distorted RbS6 octahedra that share corners with six equivalent Ce(1)S6 octahedra, edges with six equivalent Rb(1)S6 octahedra, and edges with six equivalent Ce(1)S6 octahedra. The corner-sharing octahedral tilt angles are 12°. Ce(1) is bonded to six equivalent S(1) atoms to form CeS6 octahedra that share corners with six equivalent Rb(1)S6 octahedra, edges with six equivalent Rb(1)S6 octahedra, and edges with six equivalent Ce(1)S6 octahedra. The corner-sharing octahedral tilt angles are 12°. S(1) is bonded to three equivalent Rb(1) and three equivalent Ce(1) atoms to form a mixture of corner and edge-sharing SRb3Ce3 octahedra. The corner-sharing octahedra are not tilted.
RbCeS2 is Caswellsilverite structured and crystallizes in the trigonal R-3m space group. Rb(1) is bonded to six equivalent S(1) atoms to form distorted RbS6 octahedra that share corners with six equivalent Ce(1)S6 octahedra, edges with six equivalent Rb(1)S6 octahedra, and edges with six equivalent Ce(1)S6 octahedra. The corner-sharing octahedral tilt angles are 12°. All Rb(1)-S(1) bond lengths are 3.38 Å. Ce(1) is bonded to six equivalent S(1) atoms to form CeS6 octahedra that share corners with six equivalent Rb(1)S6 octahedra, edges with six equivalent Rb(1)S6 octahedra, and edges with six equivalent Ce(1)S6 octahedra. The corner-sharing octahedral tilt angles are 12°. All Ce(1)-S(1) bond lengths are 2.89 Å. S(1) is bonded to three equivalent Rb(1) and three equivalent Ce(1) atoms to form a mixture of corner and edge-sharing SRb3Ce3 octahedra. The corner-sharing octahedra are not tilted.