RbAuUSe3 crystallizes in the orthorhombic Cmcm space group. Rb(1) is bonded in a 10-coordinate geometry to two equivalent Au(1), two equivalent Se(2), and six equivalent Se(1) atoms. U(1) is bonded to four equivalent Au(1), two equivalent Se(2), and four equivalent Se(1) atoms to form a mixture of face and corner-sharing UAu4Se6 octahedra. The corner-sharing octahedral tilt angles are 22°. Au(1) is bonded in a 10-coordinate geometry to two equivalent Rb(1), four equivalent U(1), two equivalent Se(1), and two equivalent Se(2) atoms. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a 6-coordinate geometry to three equivalent Rb(1), two equivalent U(1), and one Au(1) atom. In the second Se site, Se(2) is bonded in a 6-coordinate geometry to two equivalent Rb(1), two equivalent U(1), and two equivalent Au(1) atoms.
RbAuUSe3 crystallizes in the orthorhombic Cmcm space group. Rb(1) is bonded in a 10-coordinate geometry to two equivalent Au(1), two equivalent Se(2), and six equivalent Se(1) atoms. Both Rb(1)-Au(1) bond lengths are 3.85 Å. Both Rb(1)-Se(2) bond lengths are 3.55 Å. There are four shorter (3.66 Å) and two longer (3.70 Å) Rb(1)-Se(1) bond lengths. U(1) is bonded to four equivalent Au(1), two equivalent Se(2), and four equivalent Se(1) atoms to form a mixture of face and corner-sharing UAu4Se6 octahedra. The corner-sharing octahedral tilt angles are 22°. All U(1)-Au(1) bond lengths are 3.49 Å. Both U(1)-Se(2) bond lengths are 2.88 Å. All U(1)-Se(1) bond lengths are 2.88 Å. Au(1) is bonded in a 10-coordinate geometry to two equivalent Rb(1), four equivalent U(1), two equivalent Se(1), and two equivalent Se(2) atoms. Both Au(1)-Se(1) bond lengths are 2.57 Å. Both Au(1)-Se(2) bond lengths are 2.70 Å. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a 6-coordinate geometry to three equivalent Rb(1), two equivalent U(1), and one Au(1) atom. In the second Se site, Se(2) is bonded in a 6-coordinate geometry to two equivalent Rb(1), two equivalent U(1), and two equivalent Au(1) atoms.