RuCo8S8 crystallizes in the cubic Fm-3m space group. Ru(1) is bonded to six equivalent S(2) atoms to form RuS6 octahedra that share corners with twenty-four equivalent Co(1)S4 tetrahedra. Co(1) is bonded to one S(1) and three equivalent S(2) atoms to form CoS4 tetrahedra that share corners with three equivalent Ru(1)S6 octahedra, corners with six equivalent Co(1)S4 tetrahedra, and edges with three equivalent Co(1)S4 tetrahedra. The corner-sharing octahedral tilt angles are 53°. There are two inequivalent S sites. In the first S site, S(1) is bonded in a tetrahedral geometry to four equivalent Co(1) atoms. In the second S site, S(2) is bonded in a 5-coordinate geometry to one Ru(1) and four equivalent Co(1) atoms.
RuCo8S8 crystallizes in the cubic Fm-3m space group. Ru(1) is bonded to six equivalent S(2) atoms to form RuS6 octahedra that share corners with twenty-four equivalent Co(1)S4 tetrahedra. All Ru(1)-S(2) bond lengths are 2.37 Å. Co(1) is bonded to one S(1) and three equivalent S(2) atoms to form CoS4 tetrahedra that share corners with three equivalent Ru(1)S6 octahedra, corners with six equivalent Co(1)S4 tetrahedra, and edges with three equivalent Co(1)S4 tetrahedra. The corner-sharing octahedral tilt angles are 53°. The Co(1)-S(1) bond length is 2.12 Å. All Co(1)-S(2) bond lengths are 2.20 Å. There are two inequivalent S sites. In the first S site, S(1) is bonded in a tetrahedral geometry to four equivalent Co(1) atoms. In the second S site, S(2) is bonded in a 5-coordinate geometry to one Ru(1) and four equivalent Co(1) atoms.