Lu4CoB13 crystallizes in the tetragonal P4/mnc space group. Lu(1) is bonded in a 16-coordinate geometry to one Co(1), one B(3), six equivalent B(2), and eight equivalent B(1) atoms. Co(1) is bonded to four equivalent Lu(1) and eight equivalent B(1) atoms to form CoLu4B8 cuboctahedra that share corners with four equivalent B(3)Lu4B8 cuboctahedra and faces with two equivalent B(3)Lu4B8 cuboctahedra. There are three inequivalent B sites. In the first B site, B(1) is bonded in a 9-coordinate geometry to four equivalent Lu(1), one Co(1), one B(2), one B(3), and two equivalent B(1) atoms. In the second B site, B(2) is bonded in a 9-coordinate geometry to six equivalent Lu(1), one B(2), and two equivalent B(1) atoms. In the third B site, B(3) is bonded to four equivalent Lu(1) and eight equivalent B(1) atoms to form BLu4B8 cuboctahedra that share corners with four equivalent Co(1)Lu4B8 cuboctahedra and faces with two equivalent Co(1)Lu4B8 cuboctahedra.
Lu4CoB13 crystallizes in the tetragonal P4/mnc space group. Lu(1) is bonded in a 16-coordinate geometry to one Co(1), one B(3), six equivalent B(2), and eight equivalent B(1) atoms. The Lu(1)-Co(1) bond length is 2.65 Å. The Lu(1)-B(3) bond length is 2.62 Å. There are a spread of Lu(1)-B(2) bond distances ranging from 2.67-2.86 Å. There are a spread of Lu(1)-B(1) bond distances ranging from 2.52-2.65 Å. Co(1) is bonded to four equivalent Lu(1) and eight equivalent B(1) atoms to form CoLu4B8 cuboctahedra that share corners with four equivalent B(3)Lu4B8 cuboctahedra and faces with two equivalent B(3)Lu4B8 cuboctahedra. All Co(1)-B(1) bond lengths are 2.13 Å. There are three inequivalent B sites. In the first B site, B(1) is bonded in a 9-coordinate geometry to four equivalent Lu(1), one Co(1), one B(2), one B(3), and two equivalent B(1) atoms. The B(1)-B(2) bond length is 1.76 Å. The B(1)-B(3) bond length is 2.08 Å. Both B(1)-B(1) bond lengths are 1.79 Å. In the second B site, B(2) is bonded in a 9-coordinate geometry to six equivalent Lu(1), one B(2), and two equivalent B(1) atoms. The B(2)-B(2) bond length is 1.83 Å. In the third B site, B(3) is bonded to four equivalent Lu(1) and eight equivalent B(1) atoms to form BLu4B8 cuboctahedra that share corners with four equivalent Co(1)Lu4B8 cuboctahedra and faces with two equivalent Co(1)Lu4B8 cuboctahedra.