Pr2Co5B2 crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 16-coordinate geometry to one Pr(2), three equivalent Pr(1), three equivalent Co(1), and nine equivalent Co(3) atoms. In the second Pr site, Pr(2) is bonded in a 20-coordinate geometry to one Pr(1), one Pr(2), six equivalent Co(2), six equivalent Co(3), three equivalent B(1), and three equivalent B(2) atoms. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded to six equivalent Pr(1) and six equivalent Co(3) atoms to form edge-sharing CoPr6Co6 cuboctahedra. In the second Co site, Co(2) is bonded in a distorted square co-planar geometry to four equivalent Pr(2), two equivalent B(1), and two equivalent B(2) atoms. In the third Co site, Co(3) is bonded in a distorted L-shaped geometry to two equivalent Pr(2), three equivalent Pr(1), one Co(1), one B(1), and one B(2) atom. There are two inequivalent B sites. In the first B site, B(2) is bonded in a 6-coordinate geometry to three equivalent Pr(2), three equivalent Co(2), and three equivalent Co(3) atoms. In the second B site, B(1) is bonded in a 6-coordinate geometry to three equivalent Pr(2), three equivalent Co(2), and three equivalent Co(3) atoms.
Pr2Co5B2 crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 16-coordinate geometry to one Pr(2), three equivalent Pr(1), three equivalent Co(1), and nine equivalent Co(3) atoms. The Pr(1)-Pr(2) bond length is 3.11 Å. All Pr(1)-Pr(1) bond lengths are 3.13 Å. All Pr(1)-Co(1) bond lengths are 3.04 Å. There are three shorter (3.04 Å) and six longer (3.16 Å) Pr(1)-Co(3) bond lengths. In the second Pr site, Pr(2) is bonded in a 20-coordinate geometry to one Pr(1), one Pr(2), six equivalent Co(2), six equivalent Co(3), three equivalent B(1), and three equivalent B(2) atoms. The Pr(2)-Pr(2) bond length is 3.05 Å. All Pr(2)-Co(2) bond lengths are 3.02 Å. All Pr(2)-Co(3) bond lengths are 2.93 Å. All Pr(2)-B(1) bond lengths are 3.01 Å. All Pr(2)-B(2) bond lengths are 3.01 Å. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded to six equivalent Pr(1) and six equivalent Co(3) atoms to form edge-sharing CoPr6Co6 cuboctahedra. All Co(1)-Co(3) bond lengths are 2.63 Å. In the second Co site, Co(2) is bonded in a distorted square co-planar geometry to four equivalent Pr(2), two equivalent B(1), and two equivalent B(2) atoms. Both Co(2)-B(1) bond lengths are 2.09 Å. Both Co(2)-B(2) bond lengths are 2.13 Å. In the third Co site, Co(3) is bonded in a distorted L-shaped geometry to two equivalent Pr(2), three equivalent Pr(1), one Co(1), one B(1), and one B(2) atom. The Co(3)-B(1) bond length is 2.03 Å. The Co(3)-B(2) bond length is 2.05 Å. There are two inequivalent B sites. In the first B site, B(2) is bonded in a 6-coordinate geometry to three equivalent Pr(2), three equivalent Co(2), and three equivalent Co(3) atoms. In the second B site, B(1) is bonded in a 6-coordinate geometry to three equivalent Pr(2), three equivalent Co(2), and three equivalent Co(3) atoms.