RuCoS4 is Pyrite-derived structured and crystallizes in the monoclinic P2_1/c space group. Ru(1) is bonded to two equivalent S(2) and four equivalent S(1) atoms to form RuS6 octahedra that share corners with four equivalent Ru(1)S6 octahedra, corners with eight equivalent Co(1)S6 octahedra, corners with two equivalent S(2)Co2RuS tetrahedra, and corners with four equivalent S(1)CoRu2S tetrahedra. The corner-sharing octahedral tilt angles range from 64-66°. Co(1) is bonded to two equivalent S(1) and four equivalent S(2) atoms to form CoS6 octahedra that share corners with four equivalent Co(1)S6 octahedra, corners with eight equivalent Ru(1)S6 octahedra, corners with two equivalent S(1)CoRu2S tetrahedra, and corners with four equivalent S(2)Co2RuS tetrahedra. The corner-sharing octahedral tilt angles range from 64-65°. There are two inequivalent S sites. In the first S site, S(1) is bonded to two equivalent Ru(1), one Co(1), and one S(1) atom to form distorted SCoRu2S tetrahedra that share  a cornercorner with one Co(1)S6 octahedra, corners with two equivalent Ru(1)S6 octahedra, corners with seven equivalent S(1)CoRu2S tetrahedra, and corners with eight equivalent S(2)Co2RuS tetrahedra. The corner-sharing octahedral tilt angles range from 76-78°. In the second S site, S(2) is bonded to one Ru(1), two equivalent Co(1), and one S(2) atom to form distorted SCo2RuS tetrahedra that share  a cornercorner with one Ru(1)S6 octahedra, corners with two equivalent Co(1)S6 octahedra, corners with seven equivalent S(2)Co2RuS tetrahedra, and corners with eight equivalent S(1)CoRu2S tetrahedra. The corner-sharing octahedral tilt angles range from 75-79°.
RuCoS4 is Pyrite-derived structured and crystallizes in the monoclinic P2_1/c space group. Ru(1) is bonded to two equivalent S(2) and four equivalent S(1) atoms to form RuS6 octahedra that share corners with four equivalent Ru(1)S6 octahedra, corners with eight equivalent Co(1)S6 octahedra, corners with two equivalent S(2)Co2RuS tetrahedra, and corners with four equivalent S(1)CoRu2S tetrahedra. The corner-sharing octahedral tilt angles range from 64-66°. Both Ru(1)-S(2) bond lengths are 2.36 Å. All Ru(1)-S(1) bond lengths are 2.36 Å. Co(1) is bonded to two equivalent S(1) and four equivalent S(2) atoms to form CoS6 octahedra that share corners with four equivalent Co(1)S6 octahedra, corners with eight equivalent Ru(1)S6 octahedra, corners with two equivalent S(1)CoRu2S tetrahedra, and corners with four equivalent S(2)Co2RuS tetrahedra. The corner-sharing octahedral tilt angles range from 64-65°. Both Co(1)-S(1) bond lengths are 2.30 Å. There are two shorter (2.33 Å) and two longer (2.36 Å) Co(1)-S(2) bond lengths. There are two inequivalent S sites. In the first S site, S(1) is bonded to two equivalent Ru(1), one Co(1), and one S(1) atom to form distorted SCoRu2S tetrahedra that share  a cornercorner with one Co(1)S6 octahedra, corners with two equivalent Ru(1)S6 octahedra, corners with seven equivalent S(1)CoRu2S tetrahedra, and corners with eight equivalent S(2)Co2RuS tetrahedra. The corner-sharing octahedral tilt angles range from 76-78°. The S(1)-S(1) bond length is 2.19 Å. In the second S site, S(2) is bonded to one Ru(1), two equivalent Co(1), and one S(2) atom to form distorted SCo2RuS tetrahedra that share  a cornercorner with one Ru(1)S6 octahedra, corners with two equivalent Co(1)S6 octahedra, corners with seven equivalent S(2)Co2RuS tetrahedra, and corners with eight equivalent S(1)CoRu2S tetrahedra. The corner-sharing octahedral tilt angles range from 75-79°. The S(2)-S(2) bond length is 2.15 Å.