Ho5CoSb2 crystallizes in the orthorhombic Pnma space group. There are four inequivalent Ho sites. In the first Ho site, Ho(1) is bonded to one Co(1) and four equivalent Sb(1) atoms to form a mixture of distorted edge, corner, and face-sharing HoCoSb4 trigonal bipyramids. In the second Ho site, Ho(2) is bonded to one Co(1) and four equivalent Sb(1) atoms to form a mixture of distorted edge, corner, and face-sharing HoCoSb4 trigonal bipyramids. In the third Ho site, Ho(3) is bonded in a 5-coordinate geometry to one Co(1) and four equivalent Sb(1) atoms. In the fourth Ho site, Ho(4) is bonded in a 5-coordinate geometry to two equivalent Co(1) and three equivalent Sb(1) atoms. Co(1) is bonded to one Ho(1), one Ho(2), one Ho(3), and four equivalent Ho(4) atoms to form distorted edge-sharing CoHo7 pentagonal bipyramids. Sb(1) is bonded in a 9-coordinate geometry to two equivalent Ho(1), two equivalent Ho(2), two equivalent Ho(3), and three equivalent Ho(4) atoms.
Ho5CoSb2 crystallizes in the orthorhombic Pnma space group. There are four inequivalent Ho sites. In the first Ho site, Ho(1) is bonded to one Co(1) and four equivalent Sb(1) atoms to form a mixture of distorted edge, corner, and face-sharing HoCoSb4 trigonal bipyramids. The Ho(1)-Co(1) bond length is 2.66 Å. There are two shorter (3.13 Å) and two longer (3.14 Å) Ho(1)-Sb(1) bond lengths. In the second Ho site, Ho(2) is bonded to one Co(1) and four equivalent Sb(1) atoms to form a mixture of distorted edge, corner, and face-sharing HoCoSb4 trigonal bipyramids. The Ho(2)-Co(1) bond length is 3.05 Å. There are two shorter (3.08 Å) and two longer (3.09 Å) Ho(2)-Sb(1) bond lengths. In the third Ho site, Ho(3) is bonded in a 5-coordinate geometry to one Co(1) and four equivalent Sb(1) atoms. The Ho(3)-Co(1) bond length is 2.66 Å. There are two shorter (3.16 Å) and two longer (3.22 Å) Ho(3)-Sb(1) bond lengths. In the fourth Ho site, Ho(4) is bonded in a 5-coordinate geometry to two equivalent Co(1) and three equivalent Sb(1) atoms. There is one shorter (2.72 Å) and one longer (2.80 Å) Ho(4)-Co(1) bond length. There are a spread of Ho(4)-Sb(1) bond distances ranging from 3.30-3.52 Å. Co(1) is bonded to one Ho(1), one Ho(2), one Ho(3), and four equivalent Ho(4) atoms to form distorted edge-sharing CoHo7 pentagonal bipyramids. Sb(1) is bonded in a 9-coordinate geometry to two equivalent Ho(1), two equivalent Ho(2), two equivalent Ho(3), and three equivalent Ho(4) atoms.