Dy12(OsC3)5 crystallizes in the hexagonal P-62m space group. There are three inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a rectangular see-saw-like geometry to two equivalent C(2) and two equivalent C(4) atoms. In the second Dy site, Dy(2) is bonded to one C(1), one C(2), one C(3), and two equivalent C(4) atoms to form distorted DyC5 square pyramids that share corners with three equivalent Dy(2)C5 square pyramids,  a cornercorner with one C(3)Dy4C trigonal bipyramid, and  an edgeedge with one Dy(2)C5 square pyramid. In the third Dy site, Dy(3) is bonded in a 8-coordinate geometry to two equivalent C(1), two equivalent C(3), and four equivalent C(4) atoms. There are two inequivalent Os sites. In the first Os site, Os(1) is bonded in a 3-coordinate geometry to one C(1) and two equivalent C(2) atoms. In the second Os site, Os(2) is bonded in a trigonal planar geometry to three equivalent C(4) atoms. There are four inequivalent C sites. In the first C site, C(1) is bonded in a 6-coordinate geometry to two equivalent Dy(2), two equivalent Dy(3), one Os(1), and one C(3) atom. In the second C site, C(2) is bonded to two equivalent Dy(1), two equivalent Dy(2), and two equivalent Os(1) atoms to form CDy4Os2 octahedra that share corners with four equivalent C(2)Dy4Os2 octahedra, edges with four equivalent C(4)Dy5Os octahedra, and  an edgeedge with one C(3)Dy4C trigonal bipyramid. The corner-sharing octahedral tilt angles range from 1-34°. In the third C site, C(3) is bonded to two equivalent Dy(2), two equivalent Dy(3), and one C(1) atom to form distorted CDy4C trigonal bipyramids that share corners with four equivalent C(4)Dy5Os octahedra, corners with two equivalent Dy(2)C5 square pyramids, corners with two equivalent C(3)Dy4C trigonal bipyramids,  an edgeedge with one C(2)Dy4Os2 octahedra, and edges with four equivalent C(4)Dy5Os octahedra. The corner-sharing octahedral tilt angles are 88°. In the fourth C site, C(4) is bonded to one Dy(1), two equivalent Dy(2), two equivalent Dy(3), and one Os(2) atom to form CDy5Os octahedra that share corners with five equivalent C(4)Dy5Os octahedra, corners with two equivalent C(3)Dy4C trigonal bipyramids, edges with two equivalent C(2)Dy4Os2 octahedra, edges with three equivalent C(4)Dy5Os octahedra, and edges with two equivalent C(3)Dy4C trigonal bipyramids. The corner-sharing octahedral tilt angles range from 6-48°.
Dy12(OsC3)5 crystallizes in the hexagonal P-62m space group. There are three inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a rectangular see-saw-like geometry to two equivalent C(2) and two equivalent C(4) atoms. Both Dy(1)-C(2) bond lengths are 2.53 Å. Both Dy(1)-C(4) bond lengths are 2.49 Å. In the second Dy site, Dy(2) is bonded to one C(1), one C(2), one C(3), and two equivalent C(4) atoms to form distorted DyC5 square pyramids that share corners with three equivalent Dy(2)C5 square pyramids,  a cornercorner with one C(3)Dy4C trigonal bipyramid, and  an edgeedge with one Dy(2)C5 square pyramid. The Dy(2)-C(1) bond length is 2.52 Å. The Dy(2)-C(2) bond length is 2.37 Å. The Dy(2)-C(3) bond length is 2.54 Å. Both Dy(2)-C(4) bond lengths are 2.54 Å. In the third Dy site, Dy(3) is bonded in a 8-coordinate geometry to two equivalent C(1), two equivalent C(3), and four equivalent C(4) atoms. Both Dy(3)-C(1) bond lengths are 2.75 Å. Both Dy(3)-C(3) bond lengths are 2.54 Å. There are two shorter (2.63 Å) and two longer (2.87 Å) Dy(3)-C(4) bond lengths. There are two inequivalent Os sites. In the first Os site, Os(1) is bonded in a 3-coordinate geometry to one C(1) and two equivalent C(2) atoms. The Os(1)-C(1) bond length is 1.87 Å. Both Os(1)-C(2) bond lengths are 2.02 Å. In the second Os site, Os(2) is bonded in a trigonal planar geometry to three equivalent C(4) atoms. All Os(2)-C(4) bond lengths are 1.91 Å. There are four inequivalent C sites. In the first C site, C(1) is bonded in a 6-coordinate geometry to two equivalent Dy(2), two equivalent Dy(3), one Os(1), and one C(3) atom. The C(1)-C(3) bond length is 1.33 Å. In the second C site, C(2) is bonded to two equivalent Dy(1), two equivalent Dy(2), and two equivalent Os(1) atoms to form CDy4Os2 octahedra that share corners with four equivalent C(2)Dy4Os2 octahedra, edges with four equivalent C(4)Dy5Os octahedra, and  an edgeedge with one C(3)Dy4C trigonal bipyramid. The corner-sharing octahedral tilt angles range from 1-34°. In the third C site, C(3) is bonded to two equivalent Dy(2), two equivalent Dy(3), and one C(1) atom to form distorted CDy4C trigonal bipyramids that share corners with four equivalent C(4)Dy5Os octahedra, corners with two equivalent Dy(2)C5 square pyramids, corners with two equivalent C(3)Dy4C trigonal bipyramids,  an edgeedge with one C(2)Dy4Os2 octahedra, and edges with four equivalent C(4)Dy5Os octahedra. The corner-sharing octahedral tilt angles are 88°. In the fourth C site, C(4) is bonded to one Dy(1), two equivalent Dy(2), two equivalent Dy(3), and one Os(2) atom to form CDy5Os octahedra that share corners with five equivalent C(4)Dy5Os octahedra, corners with two equivalent C(3)Dy4C trigonal bipyramids, edges with two equivalent C(2)Dy4Os2 octahedra, edges with three equivalent C(4)Dy5Os octahedra, and edges with two equivalent C(3)Dy4C trigonal bipyramids. The corner-sharing octahedral tilt angles range from 6-48°.