Gd6C3Cl5 crystallizes in the monoclinic Cm space group. There are six inequivalent Gd sites. In the first Gd site, Gd(1) is bonded to two equivalent C(1), one Cl(1), one Cl(2), and two equivalent Cl(5) atoms to form GdC2Cl4 octahedra that share  a cornercorner with one Gd(2)C3Cl3 octahedra, corners with two equivalent Gd(6)C2Cl4 octahedra, corners with two equivalent Gd(3)C4Cl2 octahedra,  an edgeedge with one Gd(6)C2Cl4 octahedra,  an edgeedge with one Gd(3)C4Cl2 octahedra, edges with two equivalent Gd(1)C2Cl4 octahedra, edges with two equivalent Gd(2)C3Cl3 octahedra, and edges with two equivalent Gd(5)C4Cl2 octahedra. The corner-sharing octahedral tilt angles range from 0-15°. In the second Gd site, Gd(2) is bonded to one C(1), two equivalent C(3), one Cl(1), and two equivalent Cl(2) atoms to form GdC3Cl3 octahedra that share  a cornercorner with one Gd(1)C2Cl4 octahedra,  a cornercorner with one Gd(5)C4Cl2 octahedra, corners with two equivalent Gd(4)C3Cl3 octahedra,  an edgeedge with one Gd(4)C3Cl3 octahedra, edges with two equivalent Gd(1)C2Cl4 octahedra, edges with two equivalent Gd(2)C3Cl3 octahedra, edges with two equivalent Gd(3)C4Cl2 octahedra, and edges with two equivalent Gd(5)C4Cl2 octahedra. The corner-sharing octahedral tilt angles range from 0-15°. In the third Gd site, Gd(3) is bonded to one C(2), one C(3), two equivalent C(1), and two equivalent Cl(3) atoms to form GdC4Cl2 octahedra that share  a cornercorner with one Gd(4)C3Cl3 octahedra,  a cornercorner with one Gd(5)C4Cl2 octahedra, corners with two equivalent Gd(1)C2Cl4 octahedra,  an edgeedge with one Gd(1)C2Cl4 octahedra, edges with two equivalent Gd(6)C2Cl4 octahedra, edges with two equivalent Gd(2)C3Cl3 octahedra, edges with two equivalent Gd(4)C3Cl3 octahedra, edges with two equivalent Gd(3)C4Cl2 octahedra, and edges with two equivalent Gd(5)C4Cl2 octahedra. The corner-sharing octahedral tilt angles range from 0-11°. In the fourth Gd site, Gd(4) is bonded to one C(2), two equivalent C(3), one Cl(3), and two equivalent Cl(4) atoms to form GdC3Cl3 octahedra that share  a cornercorner with one Gd(6)C2Cl4 octahedra,  a cornercorner with one Gd(3)C4Cl2 octahedra, corners with two equivalent Gd(2)C3Cl3 octahedra,  an edgeedge with one Gd(2)C3Cl3 octahedra, edges with two equivalent Gd(6)C2Cl4 octahedra, edges with two equivalent Gd(4)C3Cl3 octahedra, edges with two equivalent Gd(3)C4Cl2 octahedra, and edges with two equivalent Gd(5)C4Cl2 octahedra. The corner-sharing octahedral tilt angles range from 0-15°. In the fifth Gd site, Gd(5) is bonded to one C(1), one C(3), two equivalent C(2), and two equivalent Cl(1) atoms to form GdC4Cl2 octahedra that share  a cornercorner with one Gd(2)C3Cl3 octahedra,  a cornercorner with one Gd(3)C4Cl2 octahedra, corners with two equivalent Gd(6)C2Cl4 octahedra,  an edgeedge with one Gd(6)C2Cl4 octahedra, edges with two equivalent Gd(1)C2Cl4 octahedra, edges with two equivalent Gd(2)C3Cl3 octahedra, edges with two equivalent Gd(4)C3Cl3 octahedra, edges with two equivalent Gd(3)C4Cl2 octahedra, and edges with two equivalent Gd(5)C4Cl2 octahedra. The corner-sharing octahedral tilt angles range from 0-11°. In the sixth Gd site, Gd(6) is bonded to two equivalent C(2), one Cl(3), one Cl(4), and two equivalent Cl(5) atoms to form GdC2Cl4 octahedra that share  a cornercorner with one Gd(4)C3Cl3 octahedra, corners with two equivalent Gd(1)C2Cl4 octahedra, corners with two equivalent Gd(5)C4Cl2 octahedra,  an edgeedge with one Gd(1)C2Cl4 octahedra,  an edgeedge with one Gd(5)C4Cl2 octahedra, edges with two equivalent Gd(6)C2Cl4 octahedra, edges with two equivalent Gd(4)C3Cl3 octahedra, and edges with two equivalent Gd(3)C4Cl2 octahedra. The corner-sharing octahedral tilt angles range from 0-15°. There are three inequivalent C sites. In the first C site, C(1) is bonded to one Gd(2), one Gd(5), two equivalent Gd(1), and two equivalent Gd(3) atoms to form a mixture of corner and edge-sharing CGd6 octahedra. The corner-sharing octahedral tilt angles are 9°. In the second C site, C(2) is bonded to one Gd(3), one Gd(4), two equivalent Gd(5), and two equivalent Gd(6) atoms to form a mixture of corner and edge-sharing CGd6 octahedra. The corner-sharing octahedral tilt angles are 9°. In the third C site, C(3) is bonded to one Gd(3), one Gd(5), two equivalent Gd(2), and two equivalent Gd(4) atoms to form a mixture of corner and edge-sharing CGd6 octahedra. The corner-sharing octahedral tilt angles are 9°. There are five inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a rectangular see-saw-like geometry to one Gd(1), one Gd(2), and two equivalent Gd(5) atoms. In the second Cl site, Cl(2) is bonded in a 3-coordinate geometry to one Gd(1) and two equivalent Gd(2) atoms. In the third Cl site, Cl(3) is bonded in a rectangular see-saw-like geometry to one Gd(4), one Gd(6), and two equivalent Gd(3) atoms. In the fourth Cl site, Cl(4) is bonded in a 3-coordinate geometry to one Gd(6) and two equivalent Gd(4) atoms. In the fifth Cl site, Cl(5) is bonded in a square co-planar geometry to two equivalent Gd(1) and two equivalent Gd(6) atoms.
Gd6C3Cl5 crystallizes in the monoclinic Cm space group. There are six inequivalent Gd sites. In the first Gd site, Gd(1) is bonded to two equivalent C(1), one Cl(1), one Cl(2), and two equivalent Cl(5) atoms to form GdC2Cl4 octahedra that share  a cornercorner with one Gd(2)C3Cl3 octahedra, corners with two equivalent Gd(6)C2Cl4 octahedra, corners with two equivalent Gd(3)C4Cl2 octahedra,  an edgeedge with one Gd(6)C2Cl4 octahedra,  an edgeedge with one Gd(3)C4Cl2 octahedra, edges with two equivalent Gd(1)C2Cl4 octahedra, edges with two equivalent Gd(2)C3Cl3 octahedra, and edges with two equivalent Gd(5)C4Cl2 octahedra. The corner-sharing octahedral tilt angles range from 0-15°. Both Gd(1)-C(1) bond lengths are 2.45 Å. The Gd(1)-Cl(1) bond length is 2.73 Å. The Gd(1)-Cl(2) bond length is 2.70 Å. Both Gd(1)-Cl(5) bond lengths are 2.93 Å. In the second Gd site, Gd(2) is bonded to one C(1), two equivalent C(3), one Cl(1), and two equivalent Cl(2) atoms to form GdC3Cl3 octahedra that share  a cornercorner with one Gd(1)C2Cl4 octahedra,  a cornercorner with one Gd(5)C4Cl2 octahedra, corners with two equivalent Gd(4)C3Cl3 octahedra,  an edgeedge with one Gd(4)C3Cl3 octahedra, edges with two equivalent Gd(1)C2Cl4 octahedra, edges with two equivalent Gd(2)C3Cl3 octahedra, edges with two equivalent Gd(3)C4Cl2 octahedra, and edges with two equivalent Gd(5)C4Cl2 octahedra. The corner-sharing octahedral tilt angles range from 0-15°. The Gd(2)-C(1) bond length is 2.56 Å. Both Gd(2)-C(3) bond lengths are 2.51 Å. The Gd(2)-Cl(1) bond length is 2.82 Å. Both Gd(2)-Cl(2) bond lengths are 2.85 Å. In the third Gd site, Gd(3) is bonded to one C(2), one C(3), two equivalent C(1), and two equivalent Cl(3) atoms to form GdC4Cl2 octahedra that share  a cornercorner with one Gd(4)C3Cl3 octahedra,  a cornercorner with one Gd(5)C4Cl2 octahedra, corners with two equivalent Gd(1)C2Cl4 octahedra,  an edgeedge with one Gd(1)C2Cl4 octahedra, edges with two equivalent Gd(6)C2Cl4 octahedra, edges with two equivalent Gd(2)C3Cl3 octahedra, edges with two equivalent Gd(4)C3Cl3 octahedra, edges with two equivalent Gd(3)C4Cl2 octahedra, and edges with two equivalent Gd(5)C4Cl2 octahedra. The corner-sharing octahedral tilt angles range from 0-11°. The Gd(3)-C(2) bond length is 2.69 Å. The Gd(3)-C(3) bond length is 2.69 Å. Both Gd(3)-C(1) bond lengths are 2.57 Å. Both Gd(3)-Cl(3) bond lengths are 2.89 Å. In the fourth Gd site, Gd(4) is bonded to one C(2), two equivalent C(3), one Cl(3), and two equivalent Cl(4) atoms to form GdC3Cl3 octahedra that share  a cornercorner with one Gd(6)C2Cl4 octahedra,  a cornercorner with one Gd(3)C4Cl2 octahedra, corners with two equivalent Gd(2)C3Cl3 octahedra,  an edgeedge with one Gd(2)C3Cl3 octahedra, edges with two equivalent Gd(6)C2Cl4 octahedra, edges with two equivalent Gd(4)C3Cl3 octahedra, edges with two equivalent Gd(3)C4Cl2 octahedra, and edges with two equivalent Gd(5)C4Cl2 octahedra. The corner-sharing octahedral tilt angles range from 0-15°. The Gd(4)-C(2) bond length is 2.56 Å. Both Gd(4)-C(3) bond lengths are 2.51 Å. The Gd(4)-Cl(3) bond length is 2.83 Å. Both Gd(4)-Cl(4) bond lengths are 2.84 Å. In the fifth Gd site, Gd(5) is bonded to one C(1), one C(3), two equivalent C(2), and two equivalent Cl(1) atoms to form GdC4Cl2 octahedra that share  a cornercorner with one Gd(2)C3Cl3 octahedra,  a cornercorner with one Gd(3)C4Cl2 octahedra, corners with two equivalent Gd(6)C2Cl4 octahedra,  an edgeedge with one Gd(6)C2Cl4 octahedra, edges with two equivalent Gd(1)C2Cl4 octahedra, edges with two equivalent Gd(2)C3Cl3 octahedra, edges with two equivalent Gd(4)C3Cl3 octahedra, edges with two equivalent Gd(3)C4Cl2 octahedra, and edges with two equivalent Gd(5)C4Cl2 octahedra. The corner-sharing octahedral tilt angles range from 0-11°. The Gd(5)-C(1) bond length is 2.68 Å. The Gd(5)-C(3) bond length is 2.70 Å. Both Gd(5)-C(2) bond lengths are 2.57 Å. Both Gd(5)-Cl(1) bond lengths are 2.89 Å. In the sixth Gd site, Gd(6) is bonded to two equivalent C(2), one Cl(3), one Cl(4), and two equivalent Cl(5) atoms to form GdC2Cl4 octahedra that share  a cornercorner with one Gd(4)C3Cl3 octahedra, corners with two equivalent Gd(1)C2Cl4 octahedra, corners with two equivalent Gd(5)C4Cl2 octahedra,  an edgeedge with one Gd(1)C2Cl4 octahedra,  an edgeedge with one Gd(5)C4Cl2 octahedra, edges with two equivalent Gd(6)C2Cl4 octahedra, edges with two equivalent Gd(4)C3Cl3 octahedra, and edges with two equivalent Gd(3)C4Cl2 octahedra. The corner-sharing octahedral tilt angles range from 0-15°. Both Gd(6)-C(2) bond lengths are 2.45 Å. The Gd(6)-Cl(3) bond length is 2.73 Å. The Gd(6)-Cl(4) bond length is 2.70 Å. Both Gd(6)-Cl(5) bond lengths are 2.93 Å. There are three inequivalent C sites. In the first C site, C(1) is bonded to one Gd(2), one Gd(5), two equivalent Gd(1), and two equivalent Gd(3) atoms to form a mixture of corner and edge-sharing CGd6 octahedra. The corner-sharing octahedral tilt angles are 9°. In the second C site, C(2) is bonded to one Gd(3), one Gd(4), two equivalent Gd(5), and two equivalent Gd(6) atoms to form a mixture of corner and edge-sharing CGd6 octahedra. The corner-sharing octahedral tilt angles are 9°. In the third C site, C(3) is bonded to one Gd(3), one Gd(5), two equivalent Gd(2), and two equivalent Gd(4) atoms to form a mixture of corner and edge-sharing CGd6 octahedra. The corner-sharing octahedral tilt angles are 9°. There are five inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a rectangular see-saw-like geometry to one Gd(1), one Gd(2), and two equivalent Gd(5) atoms. In the second Cl site, Cl(2) is bonded in a 3-coordinate geometry to one Gd(1) and two equivalent Gd(2) atoms. In the third Cl site, Cl(3) is bonded in a rectangular see-saw-like geometry to one Gd(4), one Gd(6), and two equivalent Gd(3) atoms. In the fourth Cl site, Cl(4) is bonded in a 3-coordinate geometry to one Gd(6) and two equivalent Gd(4) atoms. In the fifth Cl site, Cl(5) is bonded in a square co-planar geometry to two equivalent Gd(1) and two equivalent Gd(6) atoms.