RuCo4 crystallizes in the trigonal R-3m space group. Ru(1) is bonded to six equivalent Ru(1) and six equivalent Co(1) atoms to form RuCo6Ru6 cuboctahedra that share corners with six equivalent Ru(1)Co6Ru6 cuboctahedra; corners with six Co(2,2)Co12 cuboctahedra; edges with six equivalent Ru(1)Co6Ru6 cuboctahedra; edges with six Co(2,2)Co12 cuboctahedra; edges with twelve equivalent Co(1)Co9Ru3 cuboctahedra; faces with six equivalent Ru(1)Co6Ru6 cuboctahedra; and faces with twelve equivalent Co(1)Co9Ru3 cuboctahedra. There are five inequivalent Co sites. In the first Co site, Co(1) is bonded to three equivalent Ru(1), three equivalent Co(2), and six equivalent Co(1) atoms to form CoCo9Ru3 cuboctahedra that share corners with three equivalent Co(2)Co12 cuboctahedra; corners with nine equivalent Co(1)Co9Ru3 cuboctahedra; edges with six equivalent Ru(1)Co6Ru6 cuboctahedra; edges with nine Co(2,2)Co12 cuboctahedra; edges with nine equivalent Co(1)Co9Ru3 cuboctahedra; faces with six equivalent Ru(1)Co6Ru6 cuboctahedra; faces with six equivalent Co(2)Co12 cuboctahedra; and faces with six equivalent Co(1)Co9Ru3 cuboctahedra. In the second Co site, Co(2) is bonded to three equivalent Co(1) and nine Co(2,2) atoms to form CoCo12 cuboctahedra that share corners with three equivalent Ru(1)Co6Ru6 cuboctahedra; corners with three equivalent Co(1)Co9Ru3 cuboctahedra; corners with six equivalent Co(2)Co12 cuboctahedra; edges with three equivalent Ru(1)Co6Ru6 cuboctahedra; edges with nine equivalent Co(1)Co9Ru3 cuboctahedra; edges with twelve Co(2,2)Co12 cuboctahedra; faces with six equivalent Co(1)Co9Ru3 cuboctahedra; and faces with twelve Co(2,2)Co12 cuboctahedra. In the third Co site, Co(2) is bonded to three equivalent Co(1) and nine Co(2,2) atoms to form CoCo12 cuboctahedra that share corners with three equivalent Ru(1)Co6Ru6 cuboctahedra; corners with three equivalent Co(1)Co9Ru3 cuboctahedra; corners with six equivalent Co(2)Co12 cuboctahedra; edges with three equivalent Ru(1)Co6Ru6 cuboctahedra; edges with nine equivalent Co(1)Co9Ru3 cuboctahedra; edges with twelve Co(2,2)Co12 cuboctahedra; faces with six equivalent Co(1)Co9Ru3 cuboctahedra; and faces with twelve Co(2,2)Co12 cuboctahedra. In the fourth Co site, Co(2) is bonded to three equivalent Co(1) and nine Co(2,2) atoms to form CoCo12 cuboctahedra that share corners with three equivalent Ru(1)Co6Ru6 cuboctahedra; corners with three equivalent Co(1)Co9Ru3 cuboctahedra; corners with six equivalent Co(2)Co12 cuboctahedra; edges with three equivalent Ru(1)Co6Ru6 cuboctahedra; edges with nine equivalent Co(1)Co9Ru3 cuboctahedra; edges with twelve Co(2,2)Co12 cuboctahedra; faces with six equivalent Co(1)Co9Ru3 cuboctahedra; and faces with twelve Co(2,2)Co12 cuboctahedra. In the fifth Co site, Co(2) is bonded to three equivalent Co(1) and nine Co(2,2) atoms to form CoCo12 cuboctahedra that share corners with three equivalent Ru(1)Co6Ru6 cuboctahedra; corners with three equivalent Co(1)Co9Ru3 cuboctahedra; corners with six equivalent Co(2)Co12 cuboctahedra; edges with three equivalent Ru(1)Co6Ru6 cuboctahedra; edges with nine equivalent Co(1)Co9Ru3 cuboctahedra; edges with twelve Co(2,2)Co12 cuboctahedra; faces with six equivalent Co(1)Co9Ru3 cuboctahedra; and faces with twelve Co(2,2)Co12 cuboctahedra.
RuCo4 crystallizes in the trigonal R-3m space group. Ru(1) is bonded to six equivalent Ru(1) and six equivalent Co(1) atoms to form RuCo6Ru6 cuboctahedra that share corners with six equivalent Ru(1)Co6Ru6 cuboctahedra; corners with six Co(2,2)Co12 cuboctahedra; edges with six equivalent Ru(1)Co6Ru6 cuboctahedra; edges with six Co(2,2)Co12 cuboctahedra; edges with twelve equivalent Co(1)Co9Ru3 cuboctahedra; faces with six equivalent Ru(1)Co6Ru6 cuboctahedra; and faces with twelve equivalent Co(1)Co9Ru3 cuboctahedra. All Ru(1)-Ru(1) bond lengths are 2.57 Å. All Ru(1)-Co(1) bond lengths are 2.61 Å. There are five inequivalent Co sites. In the first Co site, Co(1) is bonded to three equivalent Ru(1), three equivalent Co(2), and six equivalent Co(1) atoms to form CoCo9Ru3 cuboctahedra that share corners with three equivalent Co(2)Co12 cuboctahedra; corners with nine equivalent Co(1)Co9Ru3 cuboctahedra; edges with six equivalent Ru(1)Co6Ru6 cuboctahedra; edges with nine Co(2,2)Co12 cuboctahedra; edges with nine equivalent Co(1)Co9Ru3 cuboctahedra; faces with six equivalent Ru(1)Co6Ru6 cuboctahedra; faces with six equivalent Co(2)Co12 cuboctahedra; and faces with six equivalent Co(1)Co9Ru3 cuboctahedra. All Co(1)-Co(2) bond lengths are 2.47 Å. All Co(1)-Co(1) bond lengths are 2.57 Å. In the second Co site, Co(2) is bonded to three equivalent Co(1) and nine Co(2,2) atoms to form CoCo12 cuboctahedra that share corners with three equivalent Ru(1)Co6Ru6 cuboctahedra; corners with three equivalent Co(1)Co9Ru3 cuboctahedra; corners with six equivalent Co(2)Co12 cuboctahedra; edges with three equivalent Ru(1)Co6Ru6 cuboctahedra; edges with nine equivalent Co(1)Co9Ru3 cuboctahedra; edges with twelve Co(2,2)Co12 cuboctahedra; faces with six equivalent Co(1)Co9Ru3 cuboctahedra; and faces with twelve Co(2,2)Co12 cuboctahedra. There are three shorter (2.51 Å) and six longer (2.57 Å) Co(2)-Co(2,2) bond lengths. In the third Co site, Co(2) is bonded to three equivalent Co(1) and nine Co(2,2) atoms to form CoCo12 cuboctahedra that share corners with three equivalent Ru(1)Co6Ru6 cuboctahedra; corners with three equivalent Co(1)Co9Ru3 cuboctahedra; corners with six equivalent Co(2)Co12 cuboctahedra; edges with three equivalent Ru(1)Co6Ru6 cuboctahedra; edges with nine equivalent Co(1)Co9Ru3 cuboctahedra; edges with twelve Co(2,2)Co12 cuboctahedra; faces with six equivalent Co(1)Co9Ru3 cuboctahedra; and faces with twelve Co(2,2)Co12 cuboctahedra. All Co(2)-Co(1) bond lengths are 2.47 Å. All Co(2)-Co(2) bond lengths are 2.57 Å. In the fourth Co site, Co(2) is bonded to three equivalent Co(1) and nine Co(2,2) atoms to form CoCo12 cuboctahedra that share corners with three equivalent Ru(1)Co6Ru6 cuboctahedra; corners with three equivalent Co(1)Co9Ru3 cuboctahedra; corners with six equivalent Co(2)Co12 cuboctahedra; edges with three equivalent Ru(1)Co6Ru6 cuboctahedra; edges with nine equivalent Co(1)Co9Ru3 cuboctahedra; edges with twelve Co(2,2)Co12 cuboctahedra; faces with six equivalent Co(1)Co9Ru3 cuboctahedra; and faces with twelve Co(2,2)Co12 cuboctahedra. All Co(2)-Co(1) bond lengths are 2.47 Å. There are three shorter (2.51 Å) and six longer (2.57 Å) Co(2)-Co(2,2) bond lengths. In the fifth Co site, Co(2) is bonded to three equivalent Co(1) and nine Co(2,2) atoms to form CoCo12 cuboctahedra that share corners with three equivalent Ru(1)Co6Ru6 cuboctahedra; corners with three equivalent Co(1)Co9Ru3 cuboctahedra; corners with six equivalent Co(2)Co12 cuboctahedra; edges with three equivalent Ru(1)Co6Ru6 cuboctahedra; edges with nine equivalent Co(1)Co9Ru3 cuboctahedra; edges with twelve Co(2,2)Co12 cuboctahedra; faces with six equivalent Co(1)Co9Ru3 cuboctahedra; and faces with twelve Co(2,2)Co12 cuboctahedra. All Co(2)-Co(1) bond lengths are 2.47 Å. There are three shorter (2.51 Å) and six longer (2.57 Å) Co(2)-Co(2,2) bond lengths.