Y4Fe34C3 crystallizes in the triclinic P-1 space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a distorted bent 120 degrees geometry to one Fe(11), one Fe(12), one Fe(7), one Fe(9), two equivalent Fe(5), three equivalent Fe(13), one C(1), and one C(2) atom. In the second Y site, Y(2) is bonded in a distorted single-bond geometry to one Fe(10), one Fe(11), one Fe(12), one Fe(8), two equivalent Fe(4), two equivalent Fe(6), three equivalent Fe(14), three equivalent Fe(18), and one C(1) atom. There are eighteen inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a single-bond geometry to one Fe(11), one Fe(12), one Fe(14), one Fe(4), one Fe(5), one Fe(7), one Fe(8), and one C(1) atom. In the second Fe site, Fe(2) is bonded in a single-bond geometry to one Fe(11), one Fe(12), one Fe(13), one Fe(18), one Fe(6), one Fe(7), one Fe(8), and one C(1) atom. In the third Fe site, Fe(3) is bonded in a single-bond geometry to one Fe(12), one Fe(13), one Fe(5), one Fe(7), one Fe(8), one Fe(9), and one C(2) atom. In the fourth Fe site, Fe(4) is bonded to two equivalent Y(2), one Fe(1), one Fe(10), one Fe(12), one Fe(14), one Fe(16), one Fe(6), one Fe(7), one Fe(8), and two equivalent Fe(18) atoms to form distorted FeY2Fe10 cuboctahedra that share  a cornercorner with one Fe(12)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(4)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(9)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(13)Y3Fe9 cuboctahedra, corners with two equivalent Fe(11)Y2Fe10 cuboctahedra, corners with two equivalent Fe(14)Y3Fe9 cuboctahedra, corners with two equivalent Fe(18)Y3Fe9 cuboctahedra, corners with five equivalent Fe(6)Y2Fe10 cuboctahedra, corners with two equivalent C(1)Y2Fe4 octahedra,  an edgeedge with one Fe(10)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(12)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(14)Y3Fe9 cuboctahedra,  an edgeedge with one C(1)Y2Fe4 octahedra,  a faceface with one Fe(10)Y2Fe10 cuboctahedra,  a faceface with one Fe(12)Y2Fe10 cuboctahedra,  a faceface with one Fe(4)Y2Fe10 cuboctahedra,  a faceface with one Fe(5)Y2Fe10 cuboctahedra, faces with two equivalent Fe(11)Y2Fe10 cuboctahedra, faces with two equivalent Fe(6)Y2Fe10 cuboctahedra, faces with three equivalent Fe(14)Y3Fe9 cuboctahedra, and faces with three equivalent Fe(18)Y3Fe9 cuboctahedra. The corner-sharing octahedral tilt angles range from 25-30°. In the fifth Fe site, Fe(5) is bonded to two equivalent Y(1), one Fe(1), one Fe(11), one Fe(15), one Fe(17), one Fe(3), one Fe(7), one Fe(8), one Fe(9), and two equivalent Fe(13) atoms to form distorted FeY2Fe10 cuboctahedra that share  a cornercorner with one Fe(10)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(11)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(5)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(6)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(18)Y3Fe9 cuboctahedra, corners with two equivalent Fe(12)Y2Fe10 cuboctahedra, corners with two equivalent Fe(13)Y3Fe9 cuboctahedra, corners with two equivalent C(1)Y2Fe4 octahedra, corners with two equivalent C(2)Y2Fe4 octahedra,  an edgeedge with one Fe(11)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(6)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(9)Y2Fe10 cuboctahedra,  an edgeedge with one C(1)Y2Fe4 octahedra,  an edgeedge with one C(2)Y2Fe4 octahedra,  a faceface with one Fe(11)Y2Fe10 cuboctahedra,  a faceface with one Fe(4)Y2Fe10 cuboctahedra,  a faceface with one Fe(5)Y2Fe10 cuboctahedra,  a faceface with one Fe(9)Y2Fe10 cuboctahedra,  a faceface with one Fe(14)Y3Fe9 cuboctahedra, faces with two equivalent Fe(12)Y2Fe10 cuboctahedra, and faces with three equivalent Fe(13)Y3Fe9 cuboctahedra. The corner-sharing octahedral tilt angles range from 22-29°. In the sixth Fe site, Fe(6) is bonded to two equivalent Y(2), one Fe(10), one Fe(11), one Fe(16), one Fe(18), one Fe(2), one Fe(4), one Fe(7), one Fe(8), and two equivalent Fe(14) atoms to form distorted FeY2Fe10 cuboctahedra that share  a cornercorner with one Fe(11)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(5)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(6)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(9)Y2Fe10 cuboctahedra, corners with two equivalent Fe(12)Y2Fe10 cuboctahedra, corners with two equivalent Fe(14)Y3Fe9 cuboctahedra, corners with two equivalent Fe(18)Y3Fe9 cuboctahedra, corners with five equivalent Fe(4)Y2Fe10 cuboctahedra, corners with two equivalent C(1)Y2Fe4 octahedra,  an edgeedge with one Fe(10)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(11)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(5)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(18)Y3Fe9 cuboctahedra,  an edgeedge with one C(1)Y2Fe4 octahedra,  a faceface with one Fe(10)Y2Fe10 cuboctahedra,  a faceface with one Fe(11)Y2Fe10 cuboctahedra,  a faceface with one Fe(6)Y2Fe10 cuboctahedra,  a faceface with one Fe(13)Y3Fe9 cuboctahedra, faces with two equivalent Fe(12)Y2Fe10 cuboctahedra, faces with two equivalent Fe(4)Y2Fe10 cuboctahedra, faces with three equivalent Fe(14)Y3Fe9 cuboctahedra, and faces with three equivalent Fe(18)Y3Fe9 cuboctahedra. The corner-sharing octahedral tilt angles range from 25-30°. In the seventh Fe site, Fe(7) is bonded in a 14-coordinate geometry to one Y(1), one Fe(1), one Fe(11), one Fe(12), one Fe(13), one Fe(16), one Fe(17), one Fe(2), one Fe(3), one Fe(4), one Fe(5), one Fe(6), one Fe(8), and one Fe(9) atom. In the eighth Fe site, Fe(8) is bonded in a 14-coordinate geometry to one Y(2), one Fe(1), one Fe(10), one Fe(11), one Fe(12), one Fe(14), one Fe(15), one Fe(18), one Fe(2), one Fe(3), one Fe(4), one Fe(5), one Fe(6), and one Fe(7) atom. In the ninth Fe site, Fe(9) is bonded to two equivalent Y(1), two equivalent Fe(13), two equivalent Fe(17), two equivalent Fe(3), two equivalent Fe(5), and two equivalent Fe(7) atoms to form FeY2Fe10 cuboctahedra that share corners with two equivalent Fe(11)Y2Fe10 cuboctahedra, corners with two equivalent Fe(12)Y2Fe10 cuboctahedra, corners with two equivalent Fe(4)Y2Fe10 cuboctahedra, corners with two equivalent Fe(6)Y2Fe10 cuboctahedra, corners with two equivalent Fe(13)Y3Fe9 cuboctahedra, corners with two equivalent C(1)Y2Fe4 octahedra, edges with two equivalent Fe(5)Y2Fe10 cuboctahedra, edges with two equivalent Fe(13)Y3Fe9 cuboctahedra, faces with two equivalent Fe(11)Y2Fe10 cuboctahedra, faces with two equivalent Fe(12)Y2Fe10 cuboctahedra, faces with two equivalent Fe(5)Y2Fe10 cuboctahedra, faces with two equivalent Fe(13)Y3Fe9 cuboctahedra, and faces with two equivalent C(2)Y2Fe4 octahedra. The corner-sharing octahedral tilt angles are 45°. In the tenth Fe site, Fe(10) is bonded to two equivalent Y(2), two equivalent Fe(14), two equivalent Fe(18), two equivalent Fe(4), two equivalent Fe(6), and two equivalent Fe(8) atoms to form FeY2Fe10 cuboctahedra that share corners with two equivalent Fe(11)Y2Fe10 cuboctahedra, corners with two equivalent Fe(12)Y2Fe10 cuboctahedra, corners with two equivalent Fe(5)Y2Fe10 cuboctahedra, corners with two equivalent Fe(14)Y3Fe9 cuboctahedra, corners with two equivalent Fe(18)Y3Fe9 cuboctahedra, corners with two equivalent C(1)Y2Fe4 octahedra, edges with two equivalent Fe(4)Y2Fe10 cuboctahedra, edges with two equivalent Fe(6)Y2Fe10 cuboctahedra, edges with two equivalent Fe(14)Y3Fe9 cuboctahedra, edges with two equivalent Fe(18)Y3Fe9 cuboctahedra, faces with two equivalent Fe(11)Y2Fe10 cuboctahedra, faces with two equivalent Fe(12)Y2Fe10 cuboctahedra, faces with two equivalent Fe(4)Y2Fe10 cuboctahedra, faces with two equivalent Fe(6)Y2Fe10 cuboctahedra, faces with two equivalent Fe(14)Y3Fe9 cuboctahedra, and faces with two equivalent Fe(18)Y3Fe9 cuboctahedra. The corner-sharing octahedral tilt angles are 44°. In the eleventh Fe site, Fe(11) is bonded to one Y(1), one Y(2), one Fe(1), one Fe(13), one Fe(14), one Fe(15), one Fe(16), one Fe(2), one Fe(5), one Fe(6), one Fe(7), and one Fe(8) atom to form distorted FeY2Fe10 cuboctahedra that share  a cornercorner with one Fe(10)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(5)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(6)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(9)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(13)Y3Fe9 cuboctahedra,  a cornercorner with one Fe(14)Y3Fe9 cuboctahedra, corners with two equivalent Fe(12)Y2Fe10 cuboctahedra, corners with two equivalent Fe(4)Y2Fe10 cuboctahedra, corners with three equivalent Fe(18)Y3Fe9 cuboctahedra,  a cornercorner with one C(2)Y2Fe4 octahedra,  an edgeedge with one Fe(5)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(6)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(13)Y3Fe9 cuboctahedra,  an edgeedge with one Fe(14)Y3Fe9 cuboctahedra,  an edgeedge with one Fe(18)Y3Fe9 cuboctahedra,  a faceface with one Fe(10)Y2Fe10 cuboctahedra,  a faceface with one Fe(5)Y2Fe10 cuboctahedra,  a faceface with one Fe(6)Y2Fe10 cuboctahedra,  a faceface with one Fe(9)Y2Fe10 cuboctahedra,  a faceface with one Fe(13)Y3Fe9 cuboctahedra,  a faceface with one Fe(14)Y3Fe9 cuboctahedra,  a faceface with one Fe(18)Y3Fe9 cuboctahedra, faces with two equivalent Fe(12)Y2Fe10 cuboctahedra, faces with two equivalent Fe(4)Y2Fe10 cuboctahedra, and faces with two equivalent C(1)Y2Fe4 octahedra. The corner-sharing octahedral tilt angles are 45°. In the twelfth Fe site, Fe(12) is bonded to one Y(1), one Y(2), one Fe(1), one Fe(15), one Fe(16), one Fe(17), one Fe(18), one Fe(2), one Fe(3), one Fe(4), one Fe(7), and one Fe(8) atom to form distorted FeY2Fe10 cuboctahedra that share  a cornercorner with one Fe(10)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(4)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(9)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(18)Y3Fe9 cuboctahedra, corners with two equivalent Fe(11)Y2Fe10 cuboctahedra, corners with two equivalent Fe(5)Y2Fe10 cuboctahedra, corners with two equivalent Fe(6)Y2Fe10 cuboctahedra, corners with three equivalent Fe(13)Y3Fe9 cuboctahedra, corners with three equivalent Fe(14)Y3Fe9 cuboctahedra,  an edgeedge with one Fe(4)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(13)Y3Fe9 cuboctahedra,  an edgeedge with one Fe(14)Y3Fe9 cuboctahedra,  an edgeedge with one Fe(18)Y3Fe9 cuboctahedra,  a faceface with one Fe(10)Y2Fe10 cuboctahedra,  a faceface with one Fe(4)Y2Fe10 cuboctahedra,  a faceface with one Fe(9)Y2Fe10 cuboctahedra,  a faceface with one Fe(13)Y3Fe9 cuboctahedra,  a faceface with one Fe(14)Y3Fe9 cuboctahedra,  a faceface with one Fe(18)Y3Fe9 cuboctahedra, faces with two equivalent Fe(11)Y2Fe10 cuboctahedra, faces with two equivalent Fe(5)Y2Fe10 cuboctahedra, faces with two equivalent Fe(6)Y2Fe10 cuboctahedra,  a faceface with one C(2)Y2Fe4 octahedra, and faces with two equivalent C(1)Y2Fe4 octahedra. In the thirteenth Fe site, Fe(13) is bonded to three equivalent Y(1), one Fe(11), one Fe(15), one Fe(17), one Fe(2), one Fe(3), one Fe(7), one Fe(9), and two equivalent Fe(5) atoms to form FeY3Fe9 cuboctahedra that share  a cornercorner with one Fe(11)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(4)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(9)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(14)Y3Fe9 cuboctahedra,  a cornercorner with one Fe(18)Y3Fe9 cuboctahedra, corners with two equivalent Fe(5)Y2Fe10 cuboctahedra, corners with three equivalent Fe(12)Y2Fe10 cuboctahedra, corners with three equivalent Fe(13)Y3Fe9 cuboctahedra, corners with two equivalent C(1)Y2Fe4 octahedra, corners with two equivalent C(2)Y2Fe4 octahedra,  an edgeedge with one Fe(11)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(12)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(9)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(13)Y3Fe9 cuboctahedra,  a faceface with one Fe(11)Y2Fe10 cuboctahedra,  a faceface with one Fe(12)Y2Fe10 cuboctahedra,  a faceface with one Fe(6)Y2Fe10 cuboctahedra,  a faceface with one Fe(9)Y2Fe10 cuboctahedra,  a faceface with one Fe(13)Y3Fe9 cuboctahedra, faces with three equivalent Fe(5)Y2Fe10 cuboctahedra,  a faceface with one C(1)Y2Fe4 octahedra, and  a faceface with one C(2)Y2Fe4 octahedra. The corner-sharing octahedral tilt angles range from 63-69°. In the fourteenth Fe site, Fe(14) is bonded to three equivalent Y(2), one Fe(1), one Fe(10), one Fe(11), one Fe(16), one Fe(18), one Fe(4), one Fe(8), and two equivalent Fe(6) atoms to form FeY3Fe9 cuboctahedra that share  a cornercorner with one Fe(10)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(11)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(13)Y3Fe9 cuboctahedra, corners with two equivalent Fe(4)Y2Fe10 cuboctahedra, corners with two equivalent Fe(6)Y2Fe10 cuboctahedra, corners with two equivalent Fe(18)Y3Fe9 cuboctahedra, corners with three equivalent Fe(12)Y2Fe10 cuboctahedra, corners with three equivalent Fe(14)Y3Fe9 cuboctahedra, corners with two equivalent C(1)Y2Fe4 octahedra,  an edgeedge with one Fe(10)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(11)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(12)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(4)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(14)Y3Fe9 cuboctahedra, edges with two equivalent Fe(18)Y3Fe9 cuboctahedra,  a faceface with one Fe(10)Y2Fe10 cuboctahedra,  a faceface with one Fe(11)Y2Fe10 cuboctahedra,  a faceface with one Fe(12)Y2Fe10 cuboctahedra,  a faceface with one Fe(5)Y2Fe10 cuboctahedra,  a faceface with one Fe(14)Y3Fe9 cuboctahedra, faces with three equivalent Fe(4)Y2Fe10 cuboctahedra, faces with three equivalent Fe(6)Y2Fe10 cuboctahedra, faces with three equivalent Fe(18)Y3Fe9 cuboctahedra, and  a faceface with one C(1)Y2Fe4 octahedra. The corner-sharing octahedral tilt angles range from 65-69°. In the fifteenth Fe site, Fe(15) is bonded in a single-bond geometry to one Fe(11), one Fe(12), one Fe(13), one Fe(5), one Fe(8), and one C(1) atom. In the sixteenth Fe site, Fe(16) is bonded in a single-bond geometry to one Fe(11), one Fe(12), one Fe(14), one Fe(18), one Fe(4), one Fe(6), one Fe(7), and one C(1) atom. In the seventeenth Fe site, Fe(17) is bonded in a single-bond geometry to one Fe(12), one Fe(13), one Fe(5), one Fe(7), one Fe(9), and one C(2) atom. In the eighteenth Fe site, Fe(18) is bonded to three equivalent Y(2), one Fe(10), one Fe(12), one Fe(14), one Fe(16), one Fe(2), one Fe(6), one Fe(8), and two equivalent Fe(4) atoms to form FeY3Fe9 cuboctahedra that share  a cornercorner with one Fe(10)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(12)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(5)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(13)Y3Fe9 cuboctahedra, corners with two equivalent Fe(4)Y2Fe10 cuboctahedra, corners with two equivalent Fe(6)Y2Fe10 cuboctahedra, corners with two equivalent Fe(14)Y3Fe9 cuboctahedra, corners with three equivalent Fe(11)Y2Fe10 cuboctahedra, corners with three equivalent Fe(18)Y3Fe9 cuboctahedra, corners with two equivalent C(1)Y2Fe4 octahedra,  an edgeedge with one Fe(10)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(11)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(12)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(6)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(18)Y3Fe9 cuboctahedra, edges with two equivalent Fe(14)Y3Fe9 cuboctahedra,  a faceface with one Fe(10)Y2Fe10 cuboctahedra,  a faceface with one Fe(11)Y2Fe10 cuboctahedra,  a faceface with one Fe(12)Y2Fe10 cuboctahedra,  a faceface with one Fe(18)Y3Fe9 cuboctahedra, faces with three equivalent Fe(4)Y2Fe10 cuboctahedra, faces with three equivalent Fe(6)Y2Fe10 cuboctahedra, faces with three equivalent Fe(14)Y3Fe9 cuboctahedra, and  a faceface with one C(1)Y2Fe4 octahedra. The corner-sharing octahedral tilt angles range from 66-70°. There are two inequivalent C sites. In the first C site, C(1) is bonded to one Y(1), one Y(2), one Fe(1), one Fe(15), one Fe(16), and one Fe(2) atom to form CY2Fe4 octahedra that share  a cornercorner with one Fe(10)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(9)Y2Fe10 cuboctahedra, corners with two equivalent Fe(4)Y2Fe10 cuboctahedra, corners with two equivalent Fe(5)Y2Fe10 cuboctahedra, corners with two equivalent Fe(6)Y2Fe10 cuboctahedra, corners with two equivalent Fe(13)Y3Fe9 cuboctahedra, corners with two equivalent Fe(14)Y3Fe9 cuboctahedra, corners with two equivalent Fe(18)Y3Fe9 cuboctahedra,  a cornercorner with one C(2)Y2Fe4 octahedra,  an edgeedge with one Fe(4)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(5)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(6)Y2Fe10 cuboctahedra,  a faceface with one Fe(13)Y3Fe9 cuboctahedra,  a faceface with one Fe(14)Y3Fe9 cuboctahedra,  a faceface with one Fe(18)Y3Fe9 cuboctahedra, faces with two equivalent Fe(11)Y2Fe10 cuboctahedra, and faces with two equivalent Fe(12)Y2Fe10 cuboctahedra. The corner-sharing octahedral tilt angles are 63°. In the second C site, C(2) is bonded to two equivalent Y(1), two equivalent Fe(17), and two equivalent Fe(3) atoms to form CY2Fe4 octahedra that share corners with two equivalent Fe(11)Y2Fe10 cuboctahedra, corners with four equivalent Fe(5)Y2Fe10 cuboctahedra, corners with four equivalent Fe(13)Y3Fe9 cuboctahedra, corners with two equivalent C(1)Y2Fe4 octahedra, edges with two equivalent Fe(5)Y2Fe10 cuboctahedra, faces with two equivalent Fe(12)Y2Fe10 cuboctahedra, faces with two equivalent Fe(9)Y2Fe10 cuboctahedra, and faces with two equivalent Fe(13)Y3Fe9 cuboctahedra. The corner-sharing octahedral tilt angles are 63°.
Y4Fe34C3 crystallizes in the triclinic P-1 space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a distorted bent 120 degrees geometry to one Fe(11), one Fe(12), one Fe(7), one Fe(9), two equivalent Fe(5), three equivalent Fe(13), one C(1), and one C(2) atom. The Y(1)-Fe(11) bond length is 3.29 Å. The Y(1)-Fe(12) bond length is 3.37 Å. The Y(1)-Fe(7) bond length is 3.06 Å. The Y(1)-Fe(9) bond length is 3.29 Å. Both Y(1)-Fe(5) bond lengths are 3.06 Å. There are a spread of Y(1)-Fe(13) bond distances ranging from 3.05-3.35 Å. The Y(1)-C(1) bond length is 2.51 Å. The Y(1)-C(2) bond length is 2.51 Å. In the second Y site, Y(2) is bonded in a distorted single-bond geometry to one Fe(10), one Fe(11), one Fe(12), one Fe(8), two equivalent Fe(4), two equivalent Fe(6), three equivalent Fe(14), three equivalent Fe(18), and one C(1) atom. The Y(2)-Fe(10) bond length is 3.26 Å. The Y(2)-Fe(11) bond length is 3.32 Å. The Y(2)-Fe(12) bond length is 3.32 Å. The Y(2)-Fe(8) bond length is 3.05 Å. There is one shorter (3.03 Å) and one longer (3.10 Å) Y(2)-Fe(4) bond length. There is one shorter (3.05 Å) and one longer (3.09 Å) Y(2)-Fe(6) bond length. There are a spread of Y(2)-Fe(14) bond distances ranging from 3.07-3.32 Å. There are a spread of Y(2)-Fe(18) bond distances ranging from 3.06-3.30 Å. The Y(2)-C(1) bond length is 2.53 Å. There are eighteen inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a single-bond geometry to one Fe(11), one Fe(12), one Fe(14), one Fe(4), one Fe(5), one Fe(7), one Fe(8), and one C(1) atom. The Fe(1)-Fe(11) bond length is 2.42 Å. The Fe(1)-Fe(12) bond length is 2.41 Å. The Fe(1)-Fe(14) bond length is 2.57 Å. The Fe(1)-Fe(4) bond length is 2.45 Å. The Fe(1)-Fe(5) bond length is 2.47 Å. The Fe(1)-Fe(7) bond length is 2.73 Å. The Fe(1)-Fe(8) bond length is 2.73 Å. The Fe(1)-C(1) bond length is 1.86 Å. In the second Fe site, Fe(2) is bonded in a single-bond geometry to one Fe(11), one Fe(12), one Fe(13), one Fe(18), one Fe(6), one Fe(7), one Fe(8), and one C(1) atom. The Fe(2)-Fe(11) bond length is 2.43 Å. The Fe(2)-Fe(12) bond length is 2.43 Å. The Fe(2)-Fe(13) bond length is 2.58 Å. The Fe(2)-Fe(18) bond length is 2.57 Å. The Fe(2)-Fe(6) bond length is 2.47 Å. The Fe(2)-Fe(7) bond length is 2.74 Å. The Fe(2)-Fe(8) bond length is 2.73 Å. The Fe(2)-C(1) bond length is 1.86 Å. In the third Fe site, Fe(3) is bonded in a single-bond geometry to one Fe(12), one Fe(13), one Fe(5), one Fe(7), one Fe(8), one Fe(9), and one C(2) atom. The Fe(3)-Fe(12) bond length is 2.43 Å. The Fe(3)-Fe(13) bond length is 2.57 Å. The Fe(3)-Fe(5) bond length is 2.47 Å. The Fe(3)-Fe(7) bond length is 2.74 Å. The Fe(3)-Fe(8) bond length is 2.74 Å. The Fe(3)-Fe(9) bond length is 2.43 Å. The Fe(3)-C(2) bond length is 1.86 Å. In the fourth Fe site, Fe(4) is bonded to two equivalent Y(2), one Fe(1), one Fe(10), one Fe(12), one Fe(14), one Fe(16), one Fe(6), one Fe(7), one Fe(8), and two equivalent Fe(18) atoms to form distorted FeY2Fe10 cuboctahedra that share  a cornercorner with one Fe(12)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(4)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(9)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(13)Y3Fe9 cuboctahedra, corners with two equivalent Fe(11)Y2Fe10 cuboctahedra, corners with two equivalent Fe(14)Y3Fe9 cuboctahedra, corners with two equivalent Fe(18)Y3Fe9 cuboctahedra, corners with five equivalent Fe(6)Y2Fe10 cuboctahedra, corners with two equivalent C(1)Y2Fe4 octahedra,  an edgeedge with one Fe(10)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(12)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(14)Y3Fe9 cuboctahedra,  an edgeedge with one C(1)Y2Fe4 octahedra,  a faceface with one Fe(10)Y2Fe10 cuboctahedra,  a faceface with one Fe(12)Y2Fe10 cuboctahedra,  a faceface with one Fe(4)Y2Fe10 cuboctahedra,  a faceface with one Fe(5)Y2Fe10 cuboctahedra, faces with two equivalent Fe(11)Y2Fe10 cuboctahedra, faces with two equivalent Fe(6)Y2Fe10 cuboctahedra, faces with three equivalent Fe(14)Y3Fe9 cuboctahedra, and faces with three equivalent Fe(18)Y3Fe9 cuboctahedra. The corner-sharing octahedral tilt angles range from 25-30°. The Fe(4)-Fe(10) bond length is 2.42 Å. The Fe(4)-Fe(12) bond length is 2.43 Å. The Fe(4)-Fe(14) bond length is 2.56 Å. The Fe(4)-Fe(16) bond length is 2.56 Å. The Fe(4)-Fe(6) bond length is 2.49 Å. The Fe(4)-Fe(7) bond length is 2.75 Å. The Fe(4)-Fe(8) bond length is 2.74 Å. There is one shorter (2.62 Å) and one longer (2.65 Å) Fe(4)-Fe(18) bond length. In the fifth Fe site, Fe(5) is bonded to two equivalent Y(1), one Fe(1), one Fe(11), one Fe(15), one Fe(17), one Fe(3), one Fe(7), one Fe(8), one Fe(9), and two equivalent Fe(13) atoms to form distorted FeY2Fe10 cuboctahedra that share  a cornercorner with one Fe(10)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(11)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(5)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(6)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(18)Y3Fe9 cuboctahedra, corners with two equivalent Fe(12)Y2Fe10 cuboctahedra, corners with two equivalent Fe(13)Y3Fe9 cuboctahedra, corners with two equivalent C(1)Y2Fe4 octahedra, corners with two equivalent C(2)Y2Fe4 octahedra,  an edgeedge with one Fe(11)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(6)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(9)Y2Fe10 cuboctahedra,  an edgeedge with one C(1)Y2Fe4 octahedra,  an edgeedge with one C(2)Y2Fe4 octahedra,  a faceface with one Fe(11)Y2Fe10 cuboctahedra,  a faceface with one Fe(4)Y2Fe10 cuboctahedra,  a faceface with one Fe(5)Y2Fe10 cuboctahedra,  a faceface with one Fe(9)Y2Fe10 cuboctahedra,  a faceface with one Fe(14)Y3Fe9 cuboctahedra, faces with two equivalent Fe(12)Y2Fe10 cuboctahedra, and faces with three equivalent Fe(13)Y3Fe9 cuboctahedra. The corner-sharing octahedral tilt angles range from 22-29°. The Fe(5)-Fe(11) bond length is 2.43 Å. The Fe(5)-Fe(15) bond length is 2.55 Å. The Fe(5)-Fe(17) bond length is 2.56 Å. The Fe(5)-Fe(7) bond length is 2.73 Å. The Fe(5)-Fe(8) bond length is 2.74 Å. The Fe(5)-Fe(9) bond length is 2.43 Å. There is one shorter (2.62 Å) and one longer (2.63 Å) Fe(5)-Fe(13) bond length. In the sixth Fe site, Fe(6) is bonded to two equivalent Y(2), one Fe(10), one Fe(11), one Fe(16), one Fe(18), one Fe(2), one Fe(4), one Fe(7), one Fe(8), and two equivalent Fe(14) atoms to form distorted FeY2Fe10 cuboctahedra that share  a cornercorner with one Fe(11)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(5)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(6)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(9)Y2Fe10 cuboctahedra, corners with two equivalent Fe(12)Y2Fe10 cuboctahedra, corners with two equivalent Fe(14)Y3Fe9 cuboctahedra, corners with two equivalent Fe(18)Y3Fe9 cuboctahedra, corners with five equivalent Fe(4)Y2Fe10 cuboctahedra, corners with two equivalent C(1)Y2Fe4 octahedra,  an edgeedge with one Fe(10)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(11)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(5)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(18)Y3Fe9 cuboctahedra,  an edgeedge with one C(1)Y2Fe4 octahedra,  a faceface with one Fe(10)Y2Fe10 cuboctahedra,  a faceface with one Fe(11)Y2Fe10 cuboctahedra,  a faceface with one Fe(6)Y2Fe10 cuboctahedra,  a faceface with one Fe(13)Y3Fe9 cuboctahedra, faces with two equivalent Fe(12)Y2Fe10 cuboctahedra, faces with two equivalent Fe(4)Y2Fe10 cuboctahedra, faces with three equivalent Fe(14)Y3Fe9 cuboctahedra, and faces with three equivalent Fe(18)Y3Fe9 cuboctahedra. The corner-sharing octahedral tilt angles range from 25-30°. The Fe(6)-Fe(10) bond length is 2.43 Å. The Fe(6)-Fe(11) bond length is 2.43 Å. The Fe(6)-Fe(16) bond length is 2.56 Å. The Fe(6)-Fe(18) bond length is 2.56 Å. The Fe(6)-Fe(7) bond length is 2.75 Å. The Fe(6)-Fe(8) bond length is 2.73 Å. There is one shorter (2.62 Å) and one longer (2.63 Å) Fe(6)-Fe(14) bond length. In the seventh Fe site, Fe(7) is bonded in a 14-coordinate geometry to one Y(1), one Fe(1), one Fe(11), one Fe(12), one Fe(13), one Fe(16), one Fe(17), one Fe(2), one Fe(3), one Fe(4), one Fe(5), one Fe(6), one Fe(8), and one Fe(9) atom. The Fe(7)-Fe(11) bond length is 2.63 Å. The Fe(7)-Fe(12) bond length is 2.65 Å. The Fe(7)-Fe(13) bond length is 2.67 Å. The Fe(7)-Fe(16) bond length is 2.64 Å. The Fe(7)-Fe(17) bond length is 2.64 Å. The Fe(7)-Fe(8) bond length is 2.39 Å. The Fe(7)-Fe(9) bond length is 2.63 Å. In the eighth Fe site, Fe(8) is bonded in a 14-coordinate geometry to one Y(2), one Fe(1), one Fe(10), one Fe(11), one Fe(12), one Fe(14), one Fe(15), one Fe(18), one Fe(2), one Fe(3), one Fe(4), one Fe(5), one Fe(6), and one Fe(7) atom. The Fe(8)-Fe(10) bond length is 2.62 Å. The Fe(8)-Fe(11) bond length is 2.63 Å. The Fe(8)-Fe(12) bond length is 2.64 Å. The Fe(8)-Fe(14) bond length is 2.67 Å. The Fe(8)-Fe(15) bond length is 2.64 Å. The Fe(8)-Fe(18) bond length is 2.65 Å. In the ninth Fe site, Fe(9) is bonded to two equivalent Y(1), two equivalent Fe(13), two equivalent Fe(17), two equivalent Fe(3), two equivalent Fe(5), and two equivalent Fe(7) atoms to form FeY2Fe10 cuboctahedra that share corners with two equivalent Fe(11)Y2Fe10 cuboctahedra, corners with two equivalent Fe(12)Y2Fe10 cuboctahedra, corners with two equivalent Fe(4)Y2Fe10 cuboctahedra, corners with two equivalent Fe(6)Y2Fe10 cuboctahedra, corners with two equivalent Fe(13)Y3Fe9 cuboctahedra, corners with two equivalent C(1)Y2Fe4 octahedra, edges with two equivalent Fe(5)Y2Fe10 cuboctahedra, edges with two equivalent Fe(13)Y3Fe9 cuboctahedra, faces with two equivalent Fe(11)Y2Fe10 cuboctahedra, faces with two equivalent Fe(12)Y2Fe10 cuboctahedra, faces with two equivalent Fe(5)Y2Fe10 cuboctahedra, faces with two equivalent Fe(13)Y3Fe9 cuboctahedra, and faces with two equivalent C(2)Y2Fe4 octahedra. The corner-sharing octahedral tilt angles are 45°. Both Fe(9)-Fe(13) bond lengths are 2.46 Å. Both Fe(9)-Fe(17) bond lengths are 2.47 Å. In the tenth Fe site, Fe(10) is bonded to two equivalent Y(2), two equivalent Fe(14), two equivalent Fe(18), two equivalent Fe(4), two equivalent Fe(6), and two equivalent Fe(8) atoms to form FeY2Fe10 cuboctahedra that share corners with two equivalent Fe(11)Y2Fe10 cuboctahedra, corners with two equivalent Fe(12)Y2Fe10 cuboctahedra, corners with two equivalent Fe(5)Y2Fe10 cuboctahedra, corners with two equivalent Fe(14)Y3Fe9 cuboctahedra, corners with two equivalent Fe(18)Y3Fe9 cuboctahedra, corners with two equivalent C(1)Y2Fe4 octahedra, edges with two equivalent Fe(4)Y2Fe10 cuboctahedra, edges with two equivalent Fe(6)Y2Fe10 cuboctahedra, edges with two equivalent Fe(14)Y3Fe9 cuboctahedra, edges with two equivalent Fe(18)Y3Fe9 cuboctahedra, faces with two equivalent Fe(11)Y2Fe10 cuboctahedra, faces with two equivalent Fe(12)Y2Fe10 cuboctahedra, faces with two equivalent Fe(4)Y2Fe10 cuboctahedra, faces with two equivalent Fe(6)Y2Fe10 cuboctahedra, faces with two equivalent Fe(14)Y3Fe9 cuboctahedra, and faces with two equivalent Fe(18)Y3Fe9 cuboctahedra. The corner-sharing octahedral tilt angles are 44°. Both Fe(10)-Fe(14) bond lengths are 2.46 Å. Both Fe(10)-Fe(18) bond lengths are 2.48 Å. In the eleventh Fe site, Fe(11) is bonded to one Y(1), one Y(2), one Fe(1), one Fe(13), one Fe(14), one Fe(15), one Fe(16), one Fe(2), one Fe(5), one Fe(6), one Fe(7), and one Fe(8) atom to form distorted FeY2Fe10 cuboctahedra that share  a cornercorner with one Fe(10)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(5)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(6)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(9)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(13)Y3Fe9 cuboctahedra,  a cornercorner with one Fe(14)Y3Fe9 cuboctahedra, corners with two equivalent Fe(12)Y2Fe10 cuboctahedra, corners with two equivalent Fe(4)Y2Fe10 cuboctahedra, corners with three equivalent Fe(18)Y3Fe9 cuboctahedra,  a cornercorner with one C(2)Y2Fe4 octahedra,  an edgeedge with one Fe(5)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(6)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(13)Y3Fe9 cuboctahedra,  an edgeedge with one Fe(14)Y3Fe9 cuboctahedra,  an edgeedge with one Fe(18)Y3Fe9 cuboctahedra,  a faceface with one Fe(10)Y2Fe10 cuboctahedra,  a faceface with one Fe(5)Y2Fe10 cuboctahedra,  a faceface with one Fe(6)Y2Fe10 cuboctahedra,  a faceface with one Fe(9)Y2Fe10 cuboctahedra,  a faceface with one Fe(13)Y3Fe9 cuboctahedra,  a faceface with one Fe(14)Y3Fe9 cuboctahedra,  a faceface with one Fe(18)Y3Fe9 cuboctahedra, faces with two equivalent Fe(12)Y2Fe10 cuboctahedra, faces with two equivalent Fe(4)Y2Fe10 cuboctahedra, and faces with two equivalent C(1)Y2Fe4 octahedra. The corner-sharing octahedral tilt angles are 45°. The Fe(11)-Fe(13) bond length is 2.47 Å. The Fe(11)-Fe(14) bond length is 2.47 Å. The Fe(11)-Fe(15) bond length is 2.47 Å. The Fe(11)-Fe(16) bond length is 2.48 Å. In the twelfth Fe site, Fe(12) is bonded to one Y(1), one Y(2), one Fe(1), one Fe(15), one Fe(16), one Fe(17), one Fe(18), one Fe(2), one Fe(3), one Fe(4), one Fe(7), and one Fe(8) atom to form distorted FeY2Fe10 cuboctahedra that share  a cornercorner with one Fe(10)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(4)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(9)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(18)Y3Fe9 cuboctahedra, corners with two equivalent Fe(11)Y2Fe10 cuboctahedra, corners with two equivalent Fe(5)Y2Fe10 cuboctahedra, corners with two equivalent Fe(6)Y2Fe10 cuboctahedra, corners with three equivalent Fe(13)Y3Fe9 cuboctahedra, corners with three equivalent Fe(14)Y3Fe9 cuboctahedra,  an edgeedge with one Fe(4)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(13)Y3Fe9 cuboctahedra,  an edgeedge with one Fe(14)Y3Fe9 cuboctahedra,  an edgeedge with one Fe(18)Y3Fe9 cuboctahedra,  a faceface with one Fe(10)Y2Fe10 cuboctahedra,  a faceface with one Fe(4)Y2Fe10 cuboctahedra,  a faceface with one Fe(9)Y2Fe10 cuboctahedra,  a faceface with one Fe(13)Y3Fe9 cuboctahedra,  a faceface with one Fe(14)Y3Fe9 cuboctahedra,  a faceface with one Fe(18)Y3Fe9 cuboctahedra, faces with two equivalent Fe(11)Y2Fe10 cuboctahedra, faces with two equivalent Fe(5)Y2Fe10 cuboctahedra, faces with two equivalent Fe(6)Y2Fe10 cuboctahedra,  a faceface with one C(2)Y2Fe4 octahedra, and faces with two equivalent C(1)Y2Fe4 octahedra. The Fe(12)-Fe(15) bond length is 2.46 Å. The Fe(12)-Fe(16) bond length is 2.47 Å. The Fe(12)-Fe(17) bond length is 2.47 Å. The Fe(12)-Fe(18) bond length is 2.47 Å. In the thirteenth Fe site, Fe(13) is bonded to three equivalent Y(1), one Fe(11), one Fe(15), one Fe(17), one Fe(2), one Fe(3), one Fe(7), one Fe(9), and two equivalent Fe(5) atoms to form FeY3Fe9 cuboctahedra that share  a cornercorner with one Fe(11)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(4)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(9)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(14)Y3Fe9 cuboctahedra,  a cornercorner with one Fe(18)Y3Fe9 cuboctahedra, corners with two equivalent Fe(5)Y2Fe10 cuboctahedra, corners with three equivalent Fe(12)Y2Fe10 cuboctahedra, corners with three equivalent Fe(13)Y3Fe9 cuboctahedra, corners with two equivalent C(1)Y2Fe4 octahedra, corners with two equivalent C(2)Y2Fe4 octahedra,  an edgeedge with one Fe(11)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(12)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(9)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(13)Y3Fe9 cuboctahedra,  a faceface with one Fe(11)Y2Fe10 cuboctahedra,  a faceface with one Fe(12)Y2Fe10 cuboctahedra,  a faceface with one Fe(6)Y2Fe10 cuboctahedra,  a faceface with one Fe(9)Y2Fe10 cuboctahedra,  a faceface with one Fe(13)Y3Fe9 cuboctahedra, faces with three equivalent Fe(5)Y2Fe10 cuboctahedra,  a faceface with one C(1)Y2Fe4 octahedra, and  a faceface with one C(2)Y2Fe4 octahedra. The corner-sharing octahedral tilt angles range from 63-69°. The Fe(13)-Fe(15) bond length is 2.55 Å. The Fe(13)-Fe(17) bond length is 2.54 Å. In the fourteenth Fe site, Fe(14) is bonded to three equivalent Y(2), one Fe(1), one Fe(10), one Fe(11), one Fe(16), one Fe(18), one Fe(4), one Fe(8), and two equivalent Fe(6) atoms to form FeY3Fe9 cuboctahedra that share  a cornercorner with one Fe(10)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(11)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(13)Y3Fe9 cuboctahedra, corners with two equivalent Fe(4)Y2Fe10 cuboctahedra, corners with two equivalent Fe(6)Y2Fe10 cuboctahedra, corners with two equivalent Fe(18)Y3Fe9 cuboctahedra, corners with three equivalent Fe(12)Y2Fe10 cuboctahedra, corners with three equivalent Fe(14)Y3Fe9 cuboctahedra, corners with two equivalent C(1)Y2Fe4 octahedra,  an edgeedge with one Fe(10)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(11)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(12)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(4)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(14)Y3Fe9 cuboctahedra, edges with two equivalent Fe(18)Y3Fe9 cuboctahedra,  a faceface with one Fe(10)Y2Fe10 cuboctahedra,  a faceface with one Fe(11)Y2Fe10 cuboctahedra,  a faceface with one Fe(12)Y2Fe10 cuboctahedra,  a faceface with one Fe(5)Y2Fe10 cuboctahedra,  a faceface with one Fe(14)Y3Fe9 cuboctahedra, faces with three equivalent Fe(4)Y2Fe10 cuboctahedra, faces with three equivalent Fe(6)Y2Fe10 cuboctahedra, faces with three equivalent Fe(18)Y3Fe9 cuboctahedra, and  a faceface with one C(1)Y2Fe4 octahedra. The corner-sharing octahedral tilt angles range from 65-69°. The Fe(14)-Fe(16) bond length is 2.54 Å. The Fe(14)-Fe(18) bond length is 2.52 Å. In the fifteenth Fe site, Fe(15) is bonded in a single-bond geometry to one Fe(11), one Fe(12), one Fe(13), one Fe(5), one Fe(8), and one C(1) atom. The Fe(15)-C(1) bond length is 1.91 Å. In the sixteenth Fe site, Fe(16) is bonded in a single-bond geometry to one Fe(11), one Fe(12), one Fe(14), one Fe(18), one Fe(4), one Fe(6), one Fe(7), and one C(1) atom. The Fe(16)-Fe(18) bond length is 2.56 Å. The Fe(16)-C(1) bond length is 1.91 Å. In the seventeenth Fe site, Fe(17) is bonded in a single-bond geometry to one Fe(12), one Fe(13), one Fe(5), one Fe(7), one Fe(9), and one C(2) atom. The Fe(17)-C(2) bond length is 1.91 Å. In the eighteenth Fe site, Fe(18) is bonded to three equivalent Y(2), one Fe(10), one Fe(12), one Fe(14), one Fe(16), one Fe(2), one Fe(6), one Fe(8), and two equivalent Fe(4) atoms to form FeY3Fe9 cuboctahedra that share  a cornercorner with one Fe(10)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(12)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(5)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(13)Y3Fe9 cuboctahedra, corners with two equivalent Fe(4)Y2Fe10 cuboctahedra, corners with two equivalent Fe(6)Y2Fe10 cuboctahedra, corners with two equivalent Fe(14)Y3Fe9 cuboctahedra, corners with three equivalent Fe(11)Y2Fe10 cuboctahedra, corners with three equivalent Fe(18)Y3Fe9 cuboctahedra, corners with two equivalent C(1)Y2Fe4 octahedra,  an edgeedge with one Fe(10)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(11)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(12)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(6)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(18)Y3Fe9 cuboctahedra, edges with two equivalent Fe(14)Y3Fe9 cuboctahedra,  a faceface with one Fe(10)Y2Fe10 cuboctahedra,  a faceface with one Fe(11)Y2Fe10 cuboctahedra,  a faceface with one Fe(12)Y2Fe10 cuboctahedra,  a faceface with one Fe(18)Y3Fe9 cuboctahedra, faces with three equivalent Fe(4)Y2Fe10 cuboctahedra, faces with three equivalent Fe(6)Y2Fe10 cuboctahedra, faces with three equivalent Fe(14)Y3Fe9 cuboctahedra, and  a faceface with one C(1)Y2Fe4 octahedra. The corner-sharing octahedral tilt angles range from 66-70°. There are two inequivalent C sites. In the first C site, C(1) is bonded to one Y(1), one Y(2), one Fe(1), one Fe(15), one Fe(16), and one Fe(2) atom to form CY2Fe4 octahedra that share  a cornercorner with one Fe(10)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(9)Y2Fe10 cuboctahedra, corners with two equivalent Fe(4)Y2Fe10 cuboctahedra, corners with two equivalent Fe(5)Y2Fe10 cuboctahedra, corners with two equivalent Fe(6)Y2Fe10 cuboctahedra, corners with two equivalent Fe(13)Y3Fe9 cuboctahedra, corners with two equivalent Fe(14)Y3Fe9 cuboctahedra, corners with two equivalent Fe(18)Y3Fe9 cuboctahedra,  a cornercorner with one C(2)Y2Fe4 octahedra,  an edgeedge with one Fe(4)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(5)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(6)Y2Fe10 cuboctahedra,  a faceface with one Fe(13)Y3Fe9 cuboctahedra,  a faceface with one Fe(14)Y3Fe9 cuboctahedra,  a faceface with one Fe(18)Y3Fe9 cuboctahedra, faces with two equivalent Fe(11)Y2Fe10 cuboctahedra, and faces with two equivalent Fe(12)Y2Fe10 cuboctahedra. The corner-sharing octahedral tilt angles are 63°. In the second C site, C(2) is bonded to two equivalent Y(1), two equivalent Fe(17), and two equivalent Fe(3) atoms to form CY2Fe4 octahedra that share corners with two equivalent Fe(11)Y2Fe10 cuboctahedra, corners with four equivalent Fe(5)Y2Fe10 cuboctahedra, corners with four equivalent Fe(13)Y3Fe9 cuboctahedra, corners with two equivalent C(1)Y2Fe4 octahedra, edges with two equivalent Fe(5)Y2Fe10 cuboctahedra, faces with two equivalent Fe(12)Y2Fe10 cuboctahedra, faces with two equivalent Fe(9)Y2Fe10 cuboctahedra, and faces with two equivalent Fe(13)Y3Fe9 cuboctahedra. The corner-sharing octahedral tilt angles are 63°.