Gd5(C2Cl)3 crystallizes in the monoclinic C2/m space group. There are five inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a 9-coordinate geometry to two equivalent C(2), two equivalent C(4), two equivalent C(5), and three equivalent C(6) atoms. In the second Gd site, Gd(2) is bonded in a 8-coordinate geometry to one C(1), one C(2), two equivalent C(5), two equivalent C(6), and two equivalent Cl(1) atoms. In the third Gd site, Gd(3) is bonded in a 8-coordinate geometry to one C(4), four equivalent C(3), one Cl(2), and two equivalent Cl(3) atoms. In the fourth Gd site, Gd(4) is bonded in a 8-coordinate geometry to one C(3), two equivalent C(2), two equivalent C(4), one Cl(1), and two equivalent Cl(2) atoms. In the fifth Gd site, Gd(5) is bonded to one C(5), four equivalent C(1), one Cl(1), and two equivalent Cl(3) atoms to form distorted GdC5Cl3 hexagonal bipyramids that share  a cornercorner with one C(6)Gd5C octahedra, edges with two equivalent Gd(5)C5Cl3 hexagonal bipyramids, and faces with three equivalent Gd(5)C5Cl3 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 10°. There are six inequivalent C sites. In the first C site, C(1) is bonded in a 6-coordinate geometry to one Gd(2), four equivalent Gd(5), and one C(1) atom. In the second C site, C(2) is bonded to one Gd(2), two equivalent Gd(1), two equivalent Gd(4), and one C(4) atom to form a mixture of distorted corner and edge-sharing CGd5C octahedra. The corner-sharing octahedral tilt angles are 19°. In the third C site, C(3) is bonded in a 6-coordinate geometry to one Gd(4), four equivalent Gd(3), and one C(3) atom. In the fourth C site, C(4) is bonded in a 6-coordinate geometry to one Gd(3), two equivalent Gd(1), two equivalent Gd(4), and one C(2) atom. In the fifth C site, C(5) is bonded in a 6-coordinate geometry to one Gd(5), two equivalent Gd(1), two equivalent Gd(2), and one C(6) atom. In the sixth C site, C(6) is bonded to two equivalent Gd(2), three equivalent Gd(1), and one C(5) atom to form distorted CGd5C octahedra that share  a cornercorner with one Gd(5)C5Cl3 hexagonal bipyramid, corners with two equivalent C(2)Gd5C octahedra, edges with three equivalent C(2)Gd5C octahedra, and edges with four equivalent C(6)Gd5C octahedra. The corner-sharing octahedral tilt angles are 19°. There are three inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a rectangular see-saw-like geometry to one Gd(4), one Gd(5), and two equivalent Gd(2) atoms. In the second Cl site, Cl(2) is bonded in a distorted T-shaped geometry to one Gd(3) and two equivalent Gd(4) atoms. In the third Cl site, Cl(3) is bonded in a distorted square co-planar geometry to two equivalent Gd(3) and two equivalent Gd(5) atoms.
Gd5(C2Cl)3 crystallizes in the monoclinic C2/m space group. There are five inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a 9-coordinate geometry to two equivalent C(2), two equivalent C(4), two equivalent C(5), and three equivalent C(6) atoms. Both Gd(1)-C(2) bond lengths are 2.68 Å. Both Gd(1)-C(4) bond lengths are 2.72 Å. Both Gd(1)-C(5) bond lengths are 2.74 Å. There is one shorter (2.37 Å) and two longer (2.65 Å) Gd(1)-C(6) bond lengths. In the second Gd site, Gd(2) is bonded in a 8-coordinate geometry to one C(1), one C(2), two equivalent C(5), two equivalent C(6), and two equivalent Cl(1) atoms. The Gd(2)-C(1) bond length is 2.38 Å. The Gd(2)-C(2) bond length is 2.48 Å. Both Gd(2)-C(5) bond lengths are 2.69 Å. Both Gd(2)-C(6) bond lengths are 2.63 Å. Both Gd(2)-Cl(1) bond lengths are 2.85 Å. In the third Gd site, Gd(3) is bonded in a 8-coordinate geometry to one C(4), four equivalent C(3), one Cl(2), and two equivalent Cl(3) atoms. The Gd(3)-C(4) bond length is 2.42 Å. There are two shorter (2.56 Å) and two longer (2.66 Å) Gd(3)-C(3) bond lengths. The Gd(3)-Cl(2) bond length is 2.95 Å. Both Gd(3)-Cl(3) bond lengths are 2.89 Å. In the fourth Gd site, Gd(4) is bonded in a 8-coordinate geometry to one C(3), two equivalent C(2), two equivalent C(4), one Cl(1), and two equivalent Cl(2) atoms. The Gd(4)-C(3) bond length is 2.33 Å. Both Gd(4)-C(2) bond lengths are 2.61 Å. Both Gd(4)-C(4) bond lengths are 2.71 Å. The Gd(4)-Cl(1) bond length is 2.99 Å. Both Gd(4)-Cl(2) bond lengths are 2.78 Å. In the fifth Gd site, Gd(5) is bonded to one C(5), four equivalent C(1), one Cl(1), and two equivalent Cl(3) atoms to form distorted GdC5Cl3 hexagonal bipyramids that share  a cornercorner with one C(6)Gd5C octahedra, edges with two equivalent Gd(5)C5Cl3 hexagonal bipyramids, and faces with three equivalent Gd(5)C5Cl3 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 10°. The Gd(5)-C(5) bond length is 2.41 Å. There are two shorter (2.56 Å) and two longer (2.64 Å) Gd(5)-C(1) bond lengths. The Gd(5)-Cl(1) bond length is 3.02 Å. Both Gd(5)-Cl(3) bond lengths are 2.89 Å. There are six inequivalent C sites. In the first C site, C(1) is bonded in a 6-coordinate geometry to one Gd(2), four equivalent Gd(5), and one C(1) atom. The C(1)-C(1) bond length is 1.35 Å. In the second C site, C(2) is bonded to one Gd(2), two equivalent Gd(1), two equivalent Gd(4), and one C(4) atom to form a mixture of distorted corner and edge-sharing CGd5C octahedra. The corner-sharing octahedral tilt angles are 19°. The C(2)-C(4) bond length is 1.32 Å. In the third C site, C(3) is bonded in a 6-coordinate geometry to one Gd(4), four equivalent Gd(3), and one C(3) atom. The C(3)-C(3) bond length is 1.35 Å. In the fourth C site, C(4) is bonded in a 6-coordinate geometry to one Gd(3), two equivalent Gd(1), two equivalent Gd(4), and one C(2) atom. In the fifth C site, C(5) is bonded in a 6-coordinate geometry to one Gd(5), two equivalent Gd(1), two equivalent Gd(2), and one C(6) atom. The C(5)-C(6) bond length is 1.32 Å. In the sixth C site, C(6) is bonded to two equivalent Gd(2), three equivalent Gd(1), and one C(5) atom to form distorted CGd5C octahedra that share  a cornercorner with one Gd(5)C5Cl3 hexagonal bipyramid, corners with two equivalent C(2)Gd5C octahedra, edges with three equivalent C(2)Gd5C octahedra, and edges with four equivalent C(6)Gd5C octahedra. The corner-sharing octahedral tilt angles are 19°. There are three inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a rectangular see-saw-like geometry to one Gd(4), one Gd(5), and two equivalent Gd(2) atoms. In the second Cl site, Cl(2) is bonded in a distorted T-shaped geometry to one Gd(3) and two equivalent Gd(4) atoms. In the third Cl site, Cl(3) is bonded in a distorted square co-planar geometry to two equivalent Gd(3) and two equivalent Gd(5) atoms.