Sm4(CoB2)3 crystallizes in the trigonal R-3m space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 6-coordinate geometry to four equivalent Sm(2), three equivalent Co(1), three equivalent Co(2), and six equivalent B(1) atoms. In the second Sm site, Sm(2) is bonded in a 16-coordinate geometry to four equivalent Sm(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 Sm(1), six equivalent Sm(2), and two equivalent Co(2) atoms. In the second Co site, Co(2) is bonded in a 13-coordinate geometry to three equivalent Sm(1), three equivalent Sm(2), one Co(1), and six equivalent B(1) atoms. B(1) is bonded in a 9-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), two equivalent Co(2), and three equivalent B(1) atoms.
Sm4(CoB2)3 crystallizes in the trigonal R-3m space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 6-coordinate geometry to four equivalent Sm(2), three equivalent Co(1), three equivalent Co(2), and six equivalent B(1) atoms. There are three shorter (3.07 Å) and one longer (3.47 Å) Sm(1)-Sm(2) bond length. All Sm(1)-Co(1) bond lengths are 3.53 Å. All Sm(1)-Co(2) bond lengths are 3.18 Å. All Sm(1)-B(1) bond lengths are 2.68 Å. In the second Sm site, Sm(2) is bonded in a 16-coordinate geometry to four equivalent Sm(1), three equivalent Co(1), three equivalent Co(2), and six equivalent B(1) atoms. All Sm(2)-Co(1) bond lengths are 3.52 Å. All Sm(2)-Co(2) bond lengths are 3.18 Å. All Sm(2)-B(1) bond lengths are 2.68 Å. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 14-coordinate geometry to six equivalent Sm(1), six equivalent Sm(2), and two equivalent Co(2) atoms. Both Co(1)-Co(2) bond lengths are 2.55 Å. In the second Co site, Co(2) is bonded in a 13-coordinate geometry to three equivalent Sm(1), three equivalent Sm(2), one Co(1), and six equivalent B(1) atoms. All Co(2)-B(1) bond lengths are 2.14 Å. B(1) is bonded in a 9-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), two equivalent Co(2), and three equivalent B(1) atoms. There are two shorter (1.77 Å) and one longer (1.78 Å) B(1)-B(1) bond length.