Y2Fe17C crystallizes in the orthorhombic Amm2 space group. There are four inequivalent Y sites. In the first Y site, Y(1) is bonded in a distorted bent 120 degrees geometry to two equivalent Fe(11), two equivalent Fe(14), two equivalent Fe(2), two equivalent Fe(8), four equivalent Fe(13), and two equivalent C(1) atoms. In the second Y site, Y(2) is bonded in a 20-coordinate geometry to two equivalent Fe(10), two equivalent Fe(12), two equivalent Fe(14), two equivalent Fe(4), two equivalent Fe(5), two equivalent Fe(6), four equivalent Fe(13), and four equivalent Fe(9) atoms. In the third Y site, Y(3) is bonded in a distorted bent 120 degrees geometry to two equivalent Fe(10), two equivalent Fe(2), two equivalent Fe(8), four equivalent Fe(9), and two equivalent C(1) atoms. In the fourth Y site, Y(4) is bonded in a 18-coordinate geometry to two equivalent Fe(10), two equivalent Fe(4), two equivalent Fe(5), two equivalent Fe(6), two equivalent Fe(8), four equivalent Fe(7), and four equivalent Fe(9) atoms. There are fourteen inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a single-bond geometry to one Fe(2), two equivalent Fe(10), two equivalent Fe(12), two equivalent Fe(13), and one C(1) atom. In the second Fe site, Fe(2) is bonded in a 12-coordinate geometry to one Y(1), one Y(3), one Fe(1), one Fe(3), two equivalent Fe(12), two equivalent Fe(13), two equivalent Fe(8), and two equivalent Fe(9) atoms. In the third Fe site, Fe(3) is bonded in a single-bond geometry to one Fe(2), two equivalent Fe(12), two equivalent Fe(14), two equivalent Fe(9), and one C(1) atom. In the fourth Fe site, Fe(4) is bonded in a 12-coordinate geometry to one Y(2), one Y(4), one Fe(4), one Fe(5), two equivalent Fe(11), two equivalent Fe(13), two equivalent Fe(8), and two equivalent Fe(9) atoms. In the fifth Fe site, Fe(5) is bonded to one Y(2), one Y(4), one Fe(4), one Fe(6), two equivalent Fe(10), two equivalent Fe(11), two equivalent Fe(13), and two equivalent Fe(7) atoms to form distorted FeY2Fe10 cuboctahedra that share corners with two equivalent Fe(13)Y2Fe10 cuboctahedra, corners with two equivalent Fe(14)Y2Fe10 cuboctahedra, corners with two equivalent Fe(8)Y3Fe9 cuboctahedra, corners with four equivalent Fe(9)Y3Fe9 cuboctahedra, corners with two equivalent C(1)Y2Fe4 octahedra,  an edgeedge with one Fe(5)Y2Fe10 cuboctahedra, edges with two equivalent Fe(13)Y2Fe10 cuboctahedra,  a faceface with one Fe(5)Y2Fe10 cuboctahedra, faces with two equivalent Fe(13)Y2Fe10 cuboctahedra, faces with two equivalent Fe(14)Y2Fe10 cuboctahedra, faces with two equivalent Fe(10)Y3Fe9 cuboctahedra, faces with two equivalent Fe(8)Y3Fe9 cuboctahedra, and faces with four equivalent Fe(9)Y3Fe9 cuboctahedra. The corner-sharing octahedral tilt angles are 29°. In the sixth Fe site, Fe(6) is bonded in a 12-coordinate geometry to one Y(2), one Y(4), one Fe(5), one Fe(6), two equivalent Fe(11), two equivalent Fe(14), two equivalent Fe(7), and two equivalent Fe(9) atoms. In the seventh Fe site, Fe(7) is bonded in a single-bond geometry to one Y(4), one Fe(10), one Fe(11), one Fe(13), one Fe(14), one Fe(5), one Fe(6), one Fe(9), and one C(1) atom. In the eighth Fe site, Fe(8) is bonded to one Y(1), one Y(3), one Y(4), one Fe(11), two equivalent Fe(13), two equivalent Fe(2), two equivalent Fe(4), and two equivalent Fe(9) atoms to form distorted FeY3Fe9 cuboctahedra that share corners with two equivalent Fe(13)Y2Fe10 cuboctahedra, corners with two equivalent Fe(5)Y2Fe10 cuboctahedra, corners with three equivalent Fe(14)Y2Fe10 cuboctahedra, corners with four equivalent Fe(10)Y3Fe9 cuboctahedra, corners with four equivalent C(1)Y2Fe4 octahedra,  an edgeedge with one Fe(14)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(10)Y3Fe9 cuboctahedra, edges with two equivalent Fe(13)Y2Fe10 cuboctahedra, edges with four equivalent Fe(9)Y3Fe9 cuboctahedra, faces with two equivalent Fe(13)Y2Fe10 cuboctahedra, faces with two equivalent Fe(5)Y2Fe10 cuboctahedra, faces with two equivalent Fe(8)Y3Fe9 cuboctahedra, and faces with two equivalent Fe(9)Y3Fe9 cuboctahedra. The corner-sharing octahedral tilt angles are 66°. In the ninth Fe site, Fe(9) is bonded to one Y(2), one Y(3), one Y(4), one Fe(12), one Fe(13), one Fe(14), one Fe(2), one Fe(3), one Fe(4), one Fe(6), one Fe(7), and one Fe(8) atom to form distorted FeY3Fe9 cuboctahedra that share  a cornercorner with one Fe(14)Y2Fe10 cuboctahedra, corners with two equivalent Fe(5)Y2Fe10 cuboctahedra, corners with three equivalent Fe(10)Y3Fe9 cuboctahedra, corners with three equivalent Fe(9)Y3Fe9 cuboctahedra, corners with four equivalent Fe(13)Y2Fe10 cuboctahedra,  a cornercorner with one C(1)Y2Fe4 octahedra,  an edgeedge with one Fe(14)Y2Fe10 cuboctahedra, edges with two equivalent Fe(13)Y2Fe10 cuboctahedra, edges with two equivalent Fe(8)Y3Fe9 cuboctahedra,  a faceface with one Fe(13)Y2Fe10 cuboctahedra,  a faceface with one Fe(14)Y2Fe10 cuboctahedra,  a faceface with one Fe(8)Y3Fe9 cuboctahedra, faces with two equivalent Fe(5)Y2Fe10 cuboctahedra, faces with two equivalent Fe(10)Y3Fe9 cuboctahedra, faces with four equivalent Fe(9)Y3Fe9 cuboctahedra, and  a faceface with one C(1)Y2Fe4 octahedra. The corner-sharing octahedral tilt angles are 42°. In the tenth Fe site, Fe(10) is bonded to one Y(2), one Y(3), one Y(4), one Fe(12), two equivalent Fe(1), two equivalent Fe(13), two equivalent Fe(5), and two equivalent Fe(7) atoms to form distorted FeY3Fe9 cuboctahedra that share corners with two equivalent Fe(13)Y2Fe10 cuboctahedra, corners with three equivalent Fe(14)Y2Fe10 cuboctahedra, corners with four equivalent Fe(8)Y3Fe9 cuboctahedra, corners with six equivalent Fe(9)Y3Fe9 cuboctahedra,  an edgeedge with one Fe(14)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(8)Y3Fe9 cuboctahedra, edges with two equivalent Fe(13)Y2Fe10 cuboctahedra, faces with two equivalent Fe(13)Y2Fe10 cuboctahedra, faces with two equivalent Fe(5)Y2Fe10 cuboctahedra, faces with two equivalent Fe(10)Y3Fe9 cuboctahedra, faces with four equivalent Fe(9)Y3Fe9 cuboctahedra, and faces with two equivalent C(1)Y2Fe4 octahedra. In the eleventh Fe site, Fe(11) is bonded in a 14-coordinate geometry to one Y(1), one Fe(11), one Fe(14), one Fe(8), two equivalent Fe(13), two equivalent Fe(4), two equivalent Fe(5), two equivalent Fe(6), and two equivalent Fe(7) atoms. In the twelfth Fe site, Fe(12) is bonded in a 14-coordinate geometry to one Y(2), one Fe(10), one Fe(12), one Fe(14), two equivalent Fe(1), two equivalent Fe(13), two equivalent Fe(2), two equivalent Fe(3), and two equivalent Fe(9) atoms. In the thirteenth Fe site, Fe(13) is bonded to one Y(1), one Y(2), one Fe(1), one Fe(10), one Fe(11), one Fe(12), one Fe(2), one Fe(4), one Fe(5), one Fe(7), one Fe(8), and one Fe(9) atom to form FeY2Fe10 cuboctahedra that share  a cornercorner with one Fe(5)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(10)Y3Fe9 cuboctahedra,  a cornercorner with one Fe(8)Y3Fe9 cuboctahedra, corners with two equivalent Fe(13)Y2Fe10 cuboctahedra, corners with two equivalent Fe(14)Y2Fe10 cuboctahedra, corners with four equivalent Fe(9)Y3Fe9 cuboctahedra,  a cornercorner with one C(1)Y2Fe4 octahedra,  an edgeedge with one Fe(5)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(10)Y3Fe9 cuboctahedra,  an edgeedge with one Fe(8)Y3Fe9 cuboctahedra, edges with two equivalent Fe(9)Y3Fe9 cuboctahedra,  a faceface with one Fe(5)Y2Fe10 cuboctahedra,  a faceface with one Fe(10)Y3Fe9 cuboctahedra,  a faceface with one Fe(8)Y3Fe9 cuboctahedra,  a faceface with one Fe(9)Y3Fe9 cuboctahedra, faces with two equivalent Fe(14)Y2Fe10 cuboctahedra, faces with four equivalent Fe(13)Y2Fe10 cuboctahedra, and  a faceface with one C(1)Y2Fe4 octahedra. The corner-sharing octahedral tilt angles are 40°. In the fourteenth Fe site, Fe(14) is bonded to one Y(1), one Y(2), one Fe(11), one Fe(12), two equivalent Fe(3), two equivalent Fe(6), two equivalent Fe(7), and two equivalent Fe(9) atoms to form FeY2Fe10 cuboctahedra that share corners with two equivalent Fe(5)Y2Fe10 cuboctahedra, corners with two equivalent Fe(9)Y3Fe9 cuboctahedra, corners with three equivalent Fe(10)Y3Fe9 cuboctahedra, corners with three equivalent Fe(8)Y3Fe9 cuboctahedra, corners with four equivalent Fe(13)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(10)Y3Fe9 cuboctahedra,  an edgeedge with one Fe(8)Y3Fe9 cuboctahedra, edges with two equivalent Fe(9)Y3Fe9 cuboctahedra, faces with two equivalent Fe(14)Y2Fe10 cuboctahedra, faces with two equivalent Fe(5)Y2Fe10 cuboctahedra, faces with two equivalent Fe(9)Y3Fe9 cuboctahedra, faces with four equivalent Fe(13)Y2Fe10 cuboctahedra, and faces with two equivalent C(1)Y2Fe4 octahedra. C(1) is bonded to one Y(1), one Y(3), one Fe(1), one Fe(3), and two equivalent Fe(7) atoms to form CY2Fe4 octahedra that share corners with two equivalent Fe(13)Y2Fe10 cuboctahedra, corners with two equivalent Fe(5)Y2Fe10 cuboctahedra, corners with two equivalent Fe(9)Y3Fe9 cuboctahedra, corners with four equivalent Fe(8)Y3Fe9 cuboctahedra, corners with two equivalent C(1)Y2Fe4 octahedra, faces with two equivalent Fe(13)Y2Fe10 cuboctahedra, faces with two equivalent Fe(14)Y2Fe10 cuboctahedra, faces with two equivalent Fe(10)Y3Fe9 cuboctahedra, and faces with two equivalent Fe(9)Y3Fe9 cuboctahedra. The corner-sharing octahedral tilt angles range from 62-63°.
Y2Fe17C crystallizes in the orthorhombic Amm2 space group. There are four inequivalent Y sites. In the first Y site, Y(1) is bonded in a distorted bent 120 degrees geometry to two equivalent Fe(11), two equivalent Fe(14), two equivalent Fe(2), two equivalent Fe(8), four equivalent Fe(13), and two equivalent C(1) atoms. Both Y(1)-Fe(11) bond lengths are 2.94 Å. Both Y(1)-Fe(14) bond lengths are 3.30 Å. Both Y(1)-Fe(2) bond lengths are 3.07 Å. Both Y(1)-Fe(8) bond lengths are 3.10 Å. All Y(1)-Fe(13) bond lengths are 3.23 Å. Both Y(1)-C(1) bond lengths are 2.52 Å. In the second Y site, Y(2) is bonded in a 20-coordinate geometry to two equivalent Fe(10), two equivalent Fe(12), two equivalent Fe(14), two equivalent Fe(4), two equivalent Fe(5), two equivalent Fe(6), four equivalent Fe(13), and four equivalent Fe(9) atoms. Both Y(2)-Fe(10) bond lengths are 3.10 Å. Both Y(2)-Fe(12) bond lengths are 2.93 Å. Both Y(2)-Fe(14) bond lengths are 3.19 Å. Both Y(2)-Fe(4) bond lengths are 3.07 Å. Both Y(2)-Fe(5) bond lengths are 3.09 Å. Both Y(2)-Fe(6) bond lengths are 3.09 Å. All Y(2)-Fe(13) bond lengths are 3.20 Å. All Y(2)-Fe(9) bond lengths are 3.11 Å. In the third Y site, Y(3) is bonded in a distorted bent 120 degrees geometry to two equivalent Fe(10), two equivalent Fe(2), two equivalent Fe(8), four equivalent Fe(9), and two equivalent C(1) atoms. Both Y(3)-Fe(10) bond lengths are 3.41 Å. Both Y(3)-Fe(2) bond lengths are 3.00 Å. Both Y(3)-Fe(8) bond lengths are 3.07 Å. All Y(3)-Fe(9) bond lengths are 3.32 Å. Both Y(3)-C(1) bond lengths are 2.48 Å. In the fourth Y site, Y(4) is bonded in a 18-coordinate geometry to two equivalent Fe(10), two equivalent Fe(4), two equivalent Fe(5), two equivalent Fe(6), two equivalent Fe(8), four equivalent Fe(7), and four equivalent Fe(9) atoms. Both Y(4)-Fe(10) bond lengths are 3.12 Å. Both Y(4)-Fe(4) bond lengths are 3.04 Å. Both Y(4)-Fe(5) bond lengths are 3.03 Å. Both Y(4)-Fe(6) bond lengths are 3.01 Å. Both Y(4)-Fe(8) bond lengths are 3.34 Å. All Y(4)-Fe(7) bond lengths are 3.32 Å. All Y(4)-Fe(9) bond lengths are 3.13 Å. There are fourteen inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a single-bond geometry to one Fe(2), two equivalent Fe(10), two equivalent Fe(12), two equivalent Fe(13), and one C(1) atom. The Fe(1)-Fe(2) bond length is 2.53 Å. Both Fe(1)-Fe(10) bond lengths are 2.56 Å. Both Fe(1)-Fe(12) bond lengths are 2.73 Å. Both Fe(1)-Fe(13) bond lengths are 2.46 Å. The Fe(1)-C(1) bond length is 1.84 Å. In the second Fe site, Fe(2) is bonded in a 12-coordinate geometry to one Y(1), one Y(3), one Fe(1), one Fe(3), two equivalent Fe(12), two equivalent Fe(13), two equivalent Fe(8), and two equivalent Fe(9) atoms. The Fe(2)-Fe(3) bond length is 2.40 Å. Both Fe(2)-Fe(12) bond lengths are 2.74 Å. Both Fe(2)-Fe(13) bond lengths are 2.46 Å. Both Fe(2)-Fe(8) bond lengths are 2.63 Å. Both Fe(2)-Fe(9) bond lengths are 2.55 Å. In the third Fe site, Fe(3) is bonded in a single-bond geometry to one Fe(2), two equivalent Fe(12), two equivalent Fe(14), two equivalent Fe(9), and one C(1) atom. Both Fe(3)-Fe(12) bond lengths are 2.72 Å. Both Fe(3)-Fe(14) bond lengths are 2.46 Å. Both Fe(3)-Fe(9) bond lengths are 2.55 Å. The Fe(3)-C(1) bond length is 1.85 Å. In the fourth Fe site, Fe(4) is bonded in a 12-coordinate geometry to one Y(2), one Y(4), one Fe(4), one Fe(5), two equivalent Fe(11), two equivalent Fe(13), two equivalent Fe(8), and two equivalent Fe(9) atoms. The Fe(4)-Fe(4) bond length is 2.44 Å. The Fe(4)-Fe(5) bond length is 2.56 Å. Both Fe(4)-Fe(11) bond lengths are 2.77 Å. Both Fe(4)-Fe(13) bond lengths are 2.44 Å. Both Fe(4)-Fe(8) bond lengths are 2.56 Å. Both Fe(4)-Fe(9) bond lengths are 2.59 Å. In the fifth Fe site, Fe(5) is bonded to one Y(2), one Y(4), one Fe(4), one Fe(6), two equivalent Fe(10), two equivalent Fe(11), two equivalent Fe(13), and two equivalent Fe(7) atoms to form distorted FeY2Fe10 cuboctahedra that share corners with two equivalent Fe(13)Y2Fe10 cuboctahedra, corners with two equivalent Fe(14)Y2Fe10 cuboctahedra, corners with two equivalent Fe(8)Y3Fe9 cuboctahedra, corners with four equivalent Fe(9)Y3Fe9 cuboctahedra, corners with two equivalent C(1)Y2Fe4 octahedra,  an edgeedge with one Fe(5)Y2Fe10 cuboctahedra, edges with two equivalent Fe(13)Y2Fe10 cuboctahedra,  a faceface with one Fe(5)Y2Fe10 cuboctahedra, faces with two equivalent Fe(13)Y2Fe10 cuboctahedra, faces with two equivalent Fe(14)Y2Fe10 cuboctahedra, faces with two equivalent Fe(10)Y3Fe9 cuboctahedra, faces with two equivalent Fe(8)Y3Fe9 cuboctahedra, and faces with four equivalent Fe(9)Y3Fe9 cuboctahedra. The corner-sharing octahedral tilt angles are 29°. The Fe(5)-Fe(6) bond length is 2.44 Å. Both Fe(5)-Fe(10) bond lengths are 2.60 Å. Both Fe(5)-Fe(11) bond lengths are 2.75 Å. Both Fe(5)-Fe(13) bond lengths are 2.44 Å. Both Fe(5)-Fe(7) bond lengths are 2.54 Å. In the sixth Fe site, Fe(6) is bonded in a 12-coordinate geometry to one Y(2), one Y(4), one Fe(5), one Fe(6), two equivalent Fe(11), two equivalent Fe(14), two equivalent Fe(7), and two equivalent Fe(9) atoms. The Fe(6)-Fe(6) bond length is 2.58 Å. Both Fe(6)-Fe(11) bond lengths are 2.79 Å. Both Fe(6)-Fe(14) bond lengths are 2.43 Å. Both Fe(6)-Fe(7) bond lengths are 2.54 Å. Both Fe(6)-Fe(9) bond lengths are 2.61 Å. In the seventh Fe site, Fe(7) is bonded in a single-bond geometry to one Y(4), one Fe(10), one Fe(11), one Fe(13), one Fe(14), one Fe(5), one Fe(6), one Fe(9), and one C(1) atom. The Fe(7)-Fe(10) bond length is 2.51 Å. The Fe(7)-Fe(11) bond length is 2.67 Å. The Fe(7)-Fe(13) bond length is 2.49 Å. The Fe(7)-Fe(14) bond length is 2.49 Å. The Fe(7)-Fe(9) bond length is 2.52 Å. The Fe(7)-C(1) bond length is 1.92 Å. In the eighth Fe site, Fe(8) is bonded to one Y(1), one Y(3), one Y(4), one Fe(11), two equivalent Fe(13), two equivalent Fe(2), two equivalent Fe(4), and two equivalent Fe(9) atoms to form distorted FeY3Fe9 cuboctahedra that share corners with two equivalent Fe(13)Y2Fe10 cuboctahedra, corners with two equivalent Fe(5)Y2Fe10 cuboctahedra, corners with three equivalent Fe(14)Y2Fe10 cuboctahedra, corners with four equivalent Fe(10)Y3Fe9 cuboctahedra, corners with four equivalent C(1)Y2Fe4 octahedra,  an edgeedge with one Fe(14)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(10)Y3Fe9 cuboctahedra, edges with two equivalent Fe(13)Y2Fe10 cuboctahedra, edges with four equivalent Fe(9)Y3Fe9 cuboctahedra, faces with two equivalent Fe(13)Y2Fe10 cuboctahedra, faces with two equivalent Fe(5)Y2Fe10 cuboctahedra, faces with two equivalent Fe(8)Y3Fe9 cuboctahedra, and faces with two equivalent Fe(9)Y3Fe9 cuboctahedra. The corner-sharing octahedral tilt angles are 66°. The Fe(8)-Fe(11) bond length is 2.69 Å. Both Fe(8)-Fe(13) bond lengths are 2.49 Å. Both Fe(8)-Fe(9) bond lengths are 2.49 Å. In the ninth Fe site, Fe(9) is bonded to one Y(2), one Y(3), one Y(4), one Fe(12), one Fe(13), one Fe(14), one Fe(2), one Fe(3), one Fe(4), one Fe(6), one Fe(7), and one Fe(8) atom to form distorted FeY3Fe9 cuboctahedra that share  a cornercorner with one Fe(14)Y2Fe10 cuboctahedra, corners with two equivalent Fe(5)Y2Fe10 cuboctahedra, corners with three equivalent Fe(10)Y3Fe9 cuboctahedra, corners with three equivalent Fe(9)Y3Fe9 cuboctahedra, corners with four equivalent Fe(13)Y2Fe10 cuboctahedra,  a cornercorner with one C(1)Y2Fe4 octahedra,  an edgeedge with one Fe(14)Y2Fe10 cuboctahedra, edges with two equivalent Fe(13)Y2Fe10 cuboctahedra, edges with two equivalent Fe(8)Y3Fe9 cuboctahedra,  a faceface with one Fe(13)Y2Fe10 cuboctahedra,  a faceface with one Fe(14)Y2Fe10 cuboctahedra,  a faceface with one Fe(8)Y3Fe9 cuboctahedra, faces with two equivalent Fe(5)Y2Fe10 cuboctahedra, faces with two equivalent Fe(10)Y3Fe9 cuboctahedra, faces with four equivalent Fe(9)Y3Fe9 cuboctahedra, and  a faceface with one C(1)Y2Fe4 octahedra. The corner-sharing octahedral tilt angles are 42°. The Fe(9)-Fe(12) bond length is 2.68 Å. The Fe(9)-Fe(13) bond length is 2.46 Å. The Fe(9)-Fe(14) bond length is 2.47 Å. In the tenth Fe site, Fe(10) is bonded to one Y(2), one Y(3), one Y(4), one Fe(12), two equivalent Fe(1), two equivalent Fe(13), two equivalent Fe(5), and two equivalent Fe(7) atoms to form distorted FeY3Fe9 cuboctahedra that share corners with two equivalent Fe(13)Y2Fe10 cuboctahedra, corners with three equivalent Fe(14)Y2Fe10 cuboctahedra, corners with four equivalent Fe(8)Y3Fe9 cuboctahedra, corners with six equivalent Fe(9)Y3Fe9 cuboctahedra,  an edgeedge with one Fe(14)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(8)Y3Fe9 cuboctahedra, edges with two equivalent Fe(13)Y2Fe10 cuboctahedra, faces with two equivalent Fe(13)Y2Fe10 cuboctahedra, faces with two equivalent Fe(5)Y2Fe10 cuboctahedra, faces with two equivalent Fe(10)Y3Fe9 cuboctahedra, faces with four equivalent Fe(9)Y3Fe9 cuboctahedra, and faces with two equivalent C(1)Y2Fe4 octahedra. The Fe(10)-Fe(12) bond length is 2.68 Å. Both Fe(10)-Fe(13) bond lengths are 2.47 Å. In the eleventh Fe site, Fe(11) is bonded in a 14-coordinate geometry to one Y(1), one Fe(11), one Fe(14), one Fe(8), two equivalent Fe(13), two equivalent Fe(4), two equivalent Fe(5), two equivalent Fe(6), and two equivalent Fe(7) atoms. The Fe(11)-Fe(11) bond length is 2.38 Å. The Fe(11)-Fe(14) bond length is 2.66 Å. Both Fe(11)-Fe(13) bond lengths are 2.63 Å. In the twelfth Fe site, Fe(12) is bonded in a 14-coordinate geometry to one Y(2), one Fe(10), one Fe(12), one Fe(14), two equivalent Fe(1), two equivalent Fe(13), two equivalent Fe(2), two equivalent Fe(3), and two equivalent Fe(9) atoms. The Fe(12)-Fe(12) bond length is 2.39 Å. The Fe(12)-Fe(14) bond length is 2.62 Å. Both Fe(12)-Fe(13) bond lengths are 2.61 Å. In the thirteenth Fe site, Fe(13) is bonded to one Y(1), one Y(2), one Fe(1), one Fe(10), one Fe(11), one Fe(12), one Fe(2), one Fe(4), one Fe(5), one Fe(7), one Fe(8), and one Fe(9) atom to form FeY2Fe10 cuboctahedra that share  a cornercorner with one Fe(5)Y2Fe10 cuboctahedra,  a cornercorner with one Fe(10)Y3Fe9 cuboctahedra,  a cornercorner with one Fe(8)Y3Fe9 cuboctahedra, corners with two equivalent Fe(13)Y2Fe10 cuboctahedra, corners with two equivalent Fe(14)Y2Fe10 cuboctahedra, corners with four equivalent Fe(9)Y3Fe9 cuboctahedra,  a cornercorner with one C(1)Y2Fe4 octahedra,  an edgeedge with one Fe(5)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(10)Y3Fe9 cuboctahedra,  an edgeedge with one Fe(8)Y3Fe9 cuboctahedra, edges with two equivalent Fe(9)Y3Fe9 cuboctahedra,  a faceface with one Fe(5)Y2Fe10 cuboctahedra,  a faceface with one Fe(10)Y3Fe9 cuboctahedra,  a faceface with one Fe(8)Y3Fe9 cuboctahedra,  a faceface with one Fe(9)Y3Fe9 cuboctahedra, faces with two equivalent Fe(14)Y2Fe10 cuboctahedra, faces with four equivalent Fe(13)Y2Fe10 cuboctahedra, and  a faceface with one C(1)Y2Fe4 octahedra. The corner-sharing octahedral tilt angles are 40°. In the fourteenth Fe site, Fe(14) is bonded to one Y(1), one Y(2), one Fe(11), one Fe(12), two equivalent Fe(3), two equivalent Fe(6), two equivalent Fe(7), and two equivalent Fe(9) atoms to form FeY2Fe10 cuboctahedra that share corners with two equivalent Fe(5)Y2Fe10 cuboctahedra, corners with two equivalent Fe(9)Y3Fe9 cuboctahedra, corners with three equivalent Fe(10)Y3Fe9 cuboctahedra, corners with three equivalent Fe(8)Y3Fe9 cuboctahedra, corners with four equivalent Fe(13)Y2Fe10 cuboctahedra,  an edgeedge with one Fe(10)Y3Fe9 cuboctahedra,  an edgeedge with one Fe(8)Y3Fe9 cuboctahedra, edges with two equivalent Fe(9)Y3Fe9 cuboctahedra, faces with two equivalent Fe(14)Y2Fe10 cuboctahedra, faces with two equivalent Fe(5)Y2Fe10 cuboctahedra, faces with two equivalent Fe(9)Y3Fe9 cuboctahedra, faces with four equivalent Fe(13)Y2Fe10 cuboctahedra, and faces with two equivalent C(1)Y2Fe4 octahedra. C(1) is bonded to one Y(1), one Y(3), one Fe(1), one Fe(3), and two equivalent Fe(7) atoms to form CY2Fe4 octahedra that share corners with two equivalent Fe(13)Y2Fe10 cuboctahedra, corners with two equivalent Fe(5)Y2Fe10 cuboctahedra, corners with two equivalent Fe(9)Y3Fe9 cuboctahedra, corners with four equivalent Fe(8)Y3Fe9 cuboctahedra, corners with two equivalent C(1)Y2Fe4 octahedra, faces with two equivalent Fe(13)Y2Fe10 cuboctahedra, faces with two equivalent Fe(14)Y2Fe10 cuboctahedra, faces with two equivalent Fe(10)Y3Fe9 cuboctahedra, and faces with two equivalent Fe(9)Y3Fe9 cuboctahedra. The corner-sharing octahedral tilt angles range from 62-63°.