Ho(Ni2B)6 crystallizes in the orthorhombic Cmc2_1 space group. Ho(1) is bonded in a 24-coordinate geometry to one Ni(2), one Ni(4), two equivalent Ni(1), two equivalent Ni(5), four equivalent Ni(3), four equivalent Ni(6), four equivalent Ni(7), one B(2), one B(4), two equivalent B(1), and two equivalent B(3) atoms. There are seven inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one Ho(1), one B(1), one B(2), one B(3), and one B(4) atom to form distorted face-sharing NiHoB4 tetrahedra. In the second Ni site, Ni(2) is bonded in a 3-coordinate geometry to one Ho(1), one B(2), and two equivalent B(1) atoms. In the third Ni site, Ni(3) is bonded in a 4-coordinate geometry to two equivalent Ho(1), one B(2), one B(3), and two equivalent B(1) atoms. In the fourth Ni site, Ni(4) is bonded in a distorted T-shaped geometry to one Ho(1), one B(4), and two equivalent B(3) atoms. In the fifth Ni site, Ni(5) is bonded in a 3-coordinate geometry to one Ho(1), one B(1), one B(3), and one B(4) atom. In the sixth Ni site, Ni(6) is bonded in a 3-coordinate geometry to two equivalent Ho(1), one B(1), one B(2), and one B(3) atom. In the seventh Ni site, Ni(7) is bonded in a 4-coordinate geometry to two equivalent Ho(1), one B(1), one B(4), and two equivalent B(3) atoms. There are four inequivalent B sites. In the first B site, B(3) is bonded in a 7-coordinate geometry to one Ho(1), one Ni(1), one Ni(3), one Ni(4), one Ni(5), one Ni(6), and two equivalent Ni(7) atoms. In the second B site, B(1) is bonded in a 7-coordinate geometry to one Ho(1), one Ni(1), one Ni(2), one Ni(5), one Ni(6), one Ni(7), and two equivalent Ni(3) atoms. In the third B site, B(2) is bonded in a 8-coordinate geometry to one Ho(1), one Ni(2), two equivalent Ni(1), two equivalent Ni(3), and two equivalent Ni(6) atoms. In the fourth B site, B(4) is bonded in a 7-coordinate geometry to one Ho(1), one Ni(4), two equivalent Ni(1), two equivalent Ni(5), and two equivalent Ni(7) atoms.
Ho(Ni2B)6 crystallizes in the orthorhombic Cmc2_1 space group. Ho(1) is bonded in a 24-coordinate geometry to one Ni(2), one Ni(4), two equivalent Ni(1), two equivalent Ni(5), four equivalent Ni(3), four equivalent Ni(6), four equivalent Ni(7), one B(2), one B(4), two equivalent B(1), and two equivalent B(3) atoms. The Ho(1)-Ni(2) bond length is 3.02 Å. The Ho(1)-Ni(4) bond length is 3.02 Å. Both Ho(1)-Ni(1) bond lengths are 3.11 Å. Both Ho(1)-Ni(5) bond lengths are 2.97 Å. There are two shorter (3.16 Å) and two longer (3.25 Å) Ho(1)-Ni(3) bond lengths. There are two shorter (3.09 Å) and two longer (3.37 Å) Ho(1)-Ni(6) bond lengths. There are two shorter (3.15 Å) and two longer (3.36 Å) Ho(1)-Ni(7) bond lengths. The Ho(1)-B(2) bond length is 2.94 Å. The Ho(1)-B(4) bond length is 3.06 Å. Both Ho(1)-B(1) bond lengths are 3.08 Å. Both Ho(1)-B(3) bond lengths are 3.27 Å. There are seven inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one Ho(1), one B(1), one B(2), one B(3), and one B(4) atom to form distorted face-sharing NiHoB4 tetrahedra. The Ni(1)-B(1) bond length is 2.07 Å. The Ni(1)-B(2) bond length is 2.06 Å. The Ni(1)-B(3) bond length is 1.96 Å. The Ni(1)-B(4) bond length is 2.03 Å. In the second Ni site, Ni(2) is bonded in a 3-coordinate geometry to one Ho(1), one B(2), and two equivalent B(1) atoms. The Ni(2)-B(2) bond length is 2.16 Å. Both Ni(2)-B(1) bond lengths are 2.08 Å. In the third Ni site, Ni(3) is bonded in a 4-coordinate geometry to two equivalent Ho(1), one B(2), one B(3), and two equivalent B(1) atoms. The Ni(3)-B(2) bond length is 2.05 Å. The Ni(3)-B(3) bond length is 2.03 Å. There is one shorter (2.01 Å) and one longer (2.08 Å) Ni(3)-B(1) bond length. In the fourth Ni site, Ni(4) is bonded in a distorted T-shaped geometry to one Ho(1), one B(4), and two equivalent B(3) atoms. The Ni(4)-B(4) bond length is 2.07 Å. Both Ni(4)-B(3) bond lengths are 1.98 Å. In the fifth Ni site, Ni(5) is bonded in a 3-coordinate geometry to one Ho(1), one B(1), one B(3), and one B(4) atom. The Ni(5)-B(1) bond length is 2.04 Å. The Ni(5)-B(3) bond length is 2.12 Å. The Ni(5)-B(4) bond length is 2.10 Å. In the sixth Ni site, Ni(6) is bonded in a 3-coordinate geometry to two equivalent Ho(1), one B(1), one B(2), and one B(3) atom. The Ni(6)-B(1) bond length is 2.02 Å. The Ni(6)-B(2) bond length is 2.01 Å. The Ni(6)-B(3) bond length is 2.08 Å. In the seventh Ni site, Ni(7) is bonded in a 4-coordinate geometry to two equivalent Ho(1), one B(1), one B(4), and two equivalent B(3) atoms. The Ni(7)-B(1) bond length is 2.01 Å. The Ni(7)-B(4) bond length is 2.07 Å. There is one shorter (2.02 Å) and one longer (2.06 Å) Ni(7)-B(3) bond length. There are four inequivalent B sites. In the first B site, B(3) is bonded in a 7-coordinate geometry to one Ho(1), one Ni(1), one Ni(3), one Ni(4), one Ni(5), one Ni(6), and two equivalent Ni(7) atoms. In the second B site, B(1) is bonded in a 7-coordinate geometry to one Ho(1), one Ni(1), one Ni(2), one Ni(5), one Ni(6), one Ni(7), and two equivalent Ni(3) atoms. In the third B site, B(2) is bonded in a 8-coordinate geometry to one Ho(1), one Ni(2), two equivalent Ni(1), two equivalent Ni(3), and two equivalent Ni(6) atoms. In the fourth B site, B(4) is bonded in a 7-coordinate geometry to one Ho(1), one Ni(4), two equivalent Ni(1), two equivalent Ni(5), and two equivalent Ni(7) atoms.