Pr4(CoB2)3 crystallizes in the trigonal R-3m space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 16-coordinate geometry to four equivalent Pr(2), three equivalent Co(1), three equivalent Co(2), and six equivalent B(1) atoms. In the second Pr site, Pr(2) is bonded in a 16-coordinate geometry to four equivalent Pr(1), three equivalent Co(1), three equivalent Co(2), and six equivalent B(1) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 14-coordinate geometry to six equivalent Pr(1), six equivalent Pr(2), and two equivalent Co(2) atoms. In the second Co site, Co(2) is bonded in a 13-coordinate geometry to three equivalent Pr(1), three equivalent Pr(2), one Co(1), and six equivalent B(1) atoms. B(1) is bonded in a 9-coordinate geometry to two equivalent Pr(1), two equivalent Pr(2), two equivalent Co(2), and three equivalent B(1) atoms.
Pr4(CoB2)3 crystallizes in the trigonal R-3m space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 16-coordinate geometry to four equivalent Pr(2), three equivalent Co(1), three equivalent Co(2), and six equivalent B(1) atoms. There are three shorter (3.11 Å) and one longer (3.51 Å) Pr(1)-Pr(2) bond length. All Pr(1)-Co(1) bond lengths are 3.57 Å. All Pr(1)-Co(2) bond lengths are 3.23 Å. All Pr(1)-B(1) bond lengths are 2.74 Å. In the second Pr site, Pr(2) is bonded in a 16-coordinate geometry to four equivalent Pr(1), three equivalent Co(1), three equivalent Co(2), and six equivalent B(1) atoms. All Pr(2)-Co(1) bond lengths are 3.57 Å. All Pr(2)-Co(2) bond lengths are 3.23 Å. All Pr(2)-B(1) bond lengths are 2.75 Å. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 14-coordinate geometry to six equivalent Pr(1), six equivalent Pr(2), and two equivalent Co(2) atoms. Both Co(1)-Co(2) bond lengths are 2.65 Å. In the second Co site, Co(2) is bonded in a 13-coordinate geometry to three equivalent Pr(1), three equivalent Pr(2), one Co(1), and six equivalent B(1) atoms. All Co(2)-B(1) bond lengths are 2.15 Å. B(1) is bonded in a 9-coordinate geometry to two equivalent Pr(1), two equivalent Pr(2), two equivalent Co(2), and three equivalent B(1) atoms. There are two shorter (1.79 Å) and one longer (1.80 Å) B(1)-B(1) bond length.