Tb2CoIn8 crystallizes in the tetragonal P4/mmm space group. Tb(1) is bonded to four In(1,1); four equivalent In(2); and four equivalent In(3) atoms to form TbIn12 cuboctahedra that share corners with eight equivalent Tb(1)In12 cuboctahedra, edges with four equivalent In(2)Tb4In8 cuboctahedra, edges with eight equivalent In(3)Tb4In8 cuboctahedra, faces with four equivalent In(2)Tb4In8 cuboctahedra, faces with four equivalent In(3)Tb4In8 cuboctahedra, and faces with five equivalent Tb(1)In12 cuboctahedra. Co(1) is bonded in a body-centered cubic geometry to eight In(1,1,1,1) atoms. There are six inequivalent In sites. In the first In site, In(1) is bonded in a 11-coordinate geometry to two equivalent Tb(1); two equivalent Co(1); two equivalent In(2); and five In(1,1) atoms. In the second In site, In(1) is bonded in a 11-coordinate geometry to two equivalent Tb(1); two equivalent Co(1); two equivalent In(2); and five In(1,1) atoms. In the third In site, In(1) is bonded in a 11-coordinate geometry to two equivalent Tb(1); two equivalent Co(1); two equivalent In(2); and five In(1,1) atoms. In the fourth In site, In(1) is bonded in a 11-coordinate geometry to two equivalent Tb(1); two equivalent Co(1); two equivalent In(2); and five In(1,1) atoms. In the fifth In site, In(2) is bonded to four equivalent Tb(1); four In(1,1); and four equivalent In(3) atoms to form distorted InTb4In8 cuboctahedra that share corners with eight equivalent In(2)Tb4In8 cuboctahedra, edges with four equivalent Tb(1)In12 cuboctahedra, edges with eight equivalent In(3)Tb4In8 cuboctahedra, faces with four equivalent Tb(1)In12 cuboctahedra, faces with four equivalent In(3)Tb4In8 cuboctahedra, and faces with five equivalent In(2)Tb4In8 cuboctahedra. In the sixth In site, In(3) is bonded to four equivalent Tb(1), four equivalent In(2), and four equivalent In(3) atoms to form distorted InTb4In8 cuboctahedra that share corners with four equivalent In(3)Tb4In8 cuboctahedra, edges with eight equivalent Tb(1)In12 cuboctahedra, edges with eight equivalent In(2)Tb4In8 cuboctahedra, faces with four equivalent Tb(1)In12 cuboctahedra, faces with four equivalent In(2)Tb4In8 cuboctahedra, and faces with eight equivalent In(3)Tb4In8 cuboctahedra.
Tb2CoIn8 crystallizes in the tetragonal P4/mmm space group. Tb(1) is bonded to four In(1,1); four equivalent In(2); and four equivalent In(3) atoms to form TbIn12 cuboctahedra that share corners with eight equivalent Tb(1)In12 cuboctahedra, edges with four equivalent In(2)Tb4In8 cuboctahedra, edges with eight equivalent In(3)Tb4In8 cuboctahedra, faces with four equivalent In(2)Tb4In8 cuboctahedra, faces with four equivalent In(3)Tb4In8 cuboctahedra, and faces with five equivalent Tb(1)In12 cuboctahedra. All Tb(1)-In(1,1) bond lengths are 3.23 Å. All Tb(1)-In(2) bond lengths are 3.28 Å. All Tb(1)-In(3) bond lengths are 3.29 Å. Co(1) is bonded in a body-centered cubic geometry to eight In(1,1,1,1) atoms. All Co(1)-In(1,1,1,1) bond lengths are 2.73 Å. There are six inequivalent In sites. In the first In site, In(1) is bonded in a 11-coordinate geometry to two equivalent Tb(1); two equivalent Co(1); two equivalent In(2); and five In(1,1) atoms. Both In(1)-In(2) bond lengths are 3.22 Å. There is one shorter (2.87 Å) and four longer (3.28 Å) In(1)-In(1,1) bond lengths. In the second In site, In(1) is bonded in a 11-coordinate geometry to two equivalent Tb(1); two equivalent Co(1); two equivalent In(2); and five In(1,1) atoms. Both In(1)-Tb(1) bond lengths are 3.23 Å. Both In(1)-In(2) bond lengths are 3.22 Å. All In(1)-In(1) bond lengths are 3.28 Å. In the third In site, In(1) is bonded in a 11-coordinate geometry to two equivalent Tb(1); two equivalent Co(1); two equivalent In(2); and five In(1,1) atoms. Both In(1)-In(2) bond lengths are 3.22 Å. The In(1)-In(1) bond length is 2.87 Å. In the fourth In site, In(1) is bonded in a 11-coordinate geometry to two equivalent Tb(1); two equivalent Co(1); two equivalent In(2); and five In(1,1) atoms. Both In(1)-Tb(1) bond lengths are 3.23 Å. Both In(1)-In(2) bond lengths are 3.22 Å. In the fifth In site, In(2) is bonded to four equivalent Tb(1); four In(1,1); and four equivalent In(3) atoms to form distorted InTb4In8 cuboctahedra that share corners with eight equivalent In(2)Tb4In8 cuboctahedra, edges with four equivalent Tb(1)In12 cuboctahedra, edges with eight equivalent In(3)Tb4In8 cuboctahedra, faces with four equivalent Tb(1)In12 cuboctahedra, faces with four equivalent In(3)Tb4In8 cuboctahedra, and faces with five equivalent In(2)Tb4In8 cuboctahedra. All In(2)-In(3) bond lengths are 3.30 Å. In the sixth In site, In(3) is bonded to four equivalent Tb(1), four equivalent In(2), and four equivalent In(3) atoms to form distorted InTb4In8 cuboctahedra that share corners with four equivalent In(3)Tb4In8 cuboctahedra, edges with eight equivalent Tb(1)In12 cuboctahedra, edges with eight equivalent In(2)Tb4In8 cuboctahedra, faces with four equivalent Tb(1)In12 cuboctahedra, faces with four equivalent In(2)Tb4In8 cuboctahedra, and faces with eight equivalent In(3)Tb4In8 cuboctahedra. All In(3)-In(3) bond lengths are 3.28 Å.