YbEuCuS3 crystallizes in the orthorhombic Cmcm space group. Yb(1) is bonded to two equivalent S(2) and four equivalent S(1) atoms to form YbS6 octahedra that share corners with two equivalent Yb(1)S6 octahedra, edges with two equivalent Yb(1)S6 octahedra, and edges with four equivalent Cu(1)S4 tetrahedra. The corner-sharing octahedral tilt angles are 41°. Eu(1) is bonded in a 6-coordinate geometry to two equivalent S(2) and four equivalent S(1) atoms. Cu(1) is bonded to two equivalent S(1) and two equivalent S(2) atoms to form CuS4 tetrahedra that share corners with two equivalent Cu(1)S4 tetrahedra and edges with four equivalent Yb(1)S6 octahedra. There are two inequivalent S sites. In the first S site, S(1) is bonded in a 5-coordinate geometry to two equivalent Yb(1), two equivalent Eu(1), and one Cu(1) atom. In the second S site, S(2) is bonded to two equivalent Yb(1), two equivalent Eu(1), and two equivalent Cu(1) atoms to form a mixture of distorted corner and edge-sharing SYb2Eu2Cu2 octahedra. The corner-sharing octahedra are not tilted.
YbEuCuS3 crystallizes in the orthorhombic Cmcm space group. Yb(1) is bonded to two equivalent S(2) and four equivalent S(1) atoms to form YbS6 octahedra that share corners with two equivalent Yb(1)S6 octahedra, edges with two equivalent Yb(1)S6 octahedra, and edges with four equivalent Cu(1)S4 tetrahedra. The corner-sharing octahedral tilt angles are 41°. Both Yb(1)-S(2) bond lengths are 2.74 Å. All Yb(1)-S(1) bond lengths are 2.80 Å. Eu(1) is bonded in a 6-coordinate geometry to two equivalent S(2) and four equivalent S(1) atoms. Both Eu(1)-S(2) bond lengths are 2.90 Å. All Eu(1)-S(1) bond lengths are 2.94 Å. Cu(1) is bonded to two equivalent S(1) and two equivalent S(2) atoms to form CuS4 tetrahedra that share corners with two equivalent Cu(1)S4 tetrahedra and edges with four equivalent Yb(1)S6 octahedra. Both Cu(1)-S(1) bond lengths are 2.31 Å. Both Cu(1)-S(2) bond lengths are 2.35 Å. There are two inequivalent S sites. In the first S site, S(1) is bonded in a 5-coordinate geometry to two equivalent Yb(1), two equivalent Eu(1), and one Cu(1) atom. In the second S site, S(2) is bonded to two equivalent Yb(1), two equivalent Eu(1), and two equivalent Cu(1) atoms to form a mixture of distorted corner and edge-sharing SYb2Eu2Cu2 octahedra. The corner-sharing octahedra are not tilted.