Sm4Fe31(CoC2)3 crystallizes in the triclinic P1 space group. There are four inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(10), one Fe(5), one Fe(7), one C(2), one C(3), and one C(5) atom. In the second Sm site, Sm(2) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(6), one Fe(8), one Fe(9), one C(1), one C(4), and one C(6) atom. In the third Sm site, Sm(3) is bonded in a distorted trigonal planar geometry to one Fe(3), one Fe(5), one Fe(8), one Fe(9), one C(1), one C(3), and one C(5) atom. In the fourth Sm site, Sm(4) is bonded in a distorted trigonal planar geometry to one Fe(10), one Fe(4), one Fe(6), one Fe(7), one C(2), one C(4), and one C(6) atom. There are thirty-one inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 14-coordinate geometry to one Sm(1), one Fe(10), one Fe(11), one Fe(14), one Fe(15), one Fe(17), one Fe(20), one Fe(22), one Fe(26), one Fe(29), one Fe(30), one Fe(4), one Fe(5), and one Fe(7) atom. In the second Fe site, Fe(2) is bonded in a 14-coordinate geometry to one Sm(2), one Fe(12), one Fe(13), one Fe(16), one Fe(18), one Fe(19), one Fe(21), one Fe(27), one Fe(28), one Fe(3), one Fe(31), one Fe(6), one Fe(8), and one Fe(9) atom. In the third Fe site, Fe(3) is bonded in a 14-coordinate geometry to one Sm(3), one Fe(12), one Fe(13), one Fe(16), one Fe(18), one Fe(19), one Fe(2), one Fe(21), one Fe(23), one Fe(24), one Fe(5), one Fe(8), one Fe(9), and one Co(1) atom. In the fourth Fe site, Fe(4) is bonded in a 14-coordinate geometry to one Sm(4), one Fe(1), one Fe(10), one Fe(11), one Fe(14), one Fe(15), one Fe(17), one Fe(20), one Fe(22), one Fe(25), one Fe(6), one Fe(7), one Co(2), and one Co(3) atom. In the fifth Fe site, Fe(5) is bonded to one Sm(1), one Sm(3), one Fe(1), one Fe(13), one Fe(15), one Fe(17), one Fe(19), one Fe(24), one Fe(26), one Fe(3), one Fe(30), and one Co(1) atom to form distorted FeSm2Fe9Co cuboctahedra that share  a cornercorner with one Fe(9)Sm2Fe10 cuboctahedra,  a cornercorner with one Fe(7)Sm2Fe8Co2 cuboctahedra,  a cornercorner with one Fe(10)Sm2Fe9Co cuboctahedra,  a cornercorner with one Fe(8)Sm2Fe9Co cuboctahedra,  a cornercorner with one C(2)Sm2Fe3Co octahedra,  a cornercorner with one C(1)Sm2Fe4 octahedra,  a faceface with one Fe(9)Sm2Fe10 cuboctahedra,  a faceface with one Fe(7)Sm2Fe8Co2 cuboctahedra,  a faceface with one Fe(10)Sm2Fe9Co cuboctahedra,  a faceface with one Fe(8)Sm2Fe9Co cuboctahedra, faces with two equivalent C(5)Sm2Fe3Co octahedra, and faces with two equivalent C(3)Sm2Fe4 octahedra. The corner-sharing octahedral tilt angles are 45°. In the sixth Fe site, Fe(6) is bonded to one Sm(2), one Sm(4), one Fe(14), one Fe(16), one Fe(18), one Fe(2), one Fe(20), one Fe(25), one Fe(27), one Fe(31), one Fe(4), and one Co(2) atom to form distorted FeSm2Fe9Co cuboctahedra that share  a cornercorner with one Fe(9)Sm2Fe10 cuboctahedra,  a cornercorner with one Fe(7)Sm2Fe8Co2 cuboctahedra,  a cornercorner with one Fe(10)Sm2Fe9Co cuboctahedra,  a cornercorner with one Fe(8)Sm2Fe9Co cuboctahedra,  a cornercorner with one C(2)Sm2Fe3Co octahedra,  a cornercorner with one C(1)Sm2Fe4 octahedra,  a faceface with one Fe(9)Sm2Fe10 cuboctahedra,  a faceface with one Fe(7)Sm2Fe8Co2 cuboctahedra,  a faceface with one Fe(10)Sm2Fe9Co cuboctahedra,  a faceface with one Fe(8)Sm2Fe9Co cuboctahedra, faces with two equivalent C(6)Sm2Fe3Co octahedra, and faces with two equivalent C(4)Sm2Fe4 octahedra. The corner-sharing octahedral tilt angles are 45°. In the seventh Fe site, Fe(7) is bonded to one Sm(1), one Sm(4), one Fe(1), one Fe(11), one Fe(15), one Fe(20), one Fe(22), one Fe(26), one Fe(29), one Fe(4), one Co(2), and one Co(3) atom to form distorted FeSm2Fe8Co2 cuboctahedra that share  a cornercorner with one Fe(5)Sm2Fe9Co cuboctahedra,  a cornercorner with one Fe(6)Sm2Fe9Co cuboctahedra, corners with two equivalent Fe(10)Sm2Fe9Co cuboctahedra,  a cornercorner with one C(3)Sm2Fe4 octahedra,  a cornercorner with one C(4)Sm2Fe4 octahedra,  a faceface with one Fe(5)Sm2Fe9Co cuboctahedra,  a faceface with one Fe(6)Sm2Fe9Co cuboctahedra, faces with two equivalent Fe(10)Sm2Fe9Co cuboctahedra,  a faceface with one C(5)Sm2Fe3Co octahedra,  a faceface with one C(6)Sm2Fe3Co octahedra, and faces with two equivalent C(2)Sm2Fe3Co octahedra. The corner-sharing octahedral tilt angles are 45°. In the eighth Fe site, Fe(8) is bonded to one Sm(2), one Sm(3), one Fe(12), one Fe(16), one Fe(19), one Fe(2), one Fe(21), one Fe(23), one Fe(27), one Fe(28), one Fe(3), and one Co(1) atom to form distorted FeSm2Fe9Co cuboctahedra that share  a cornercorner with one Fe(5)Sm2Fe9Co cuboctahedra,  a cornercorner with one Fe(6)Sm2Fe9Co cuboctahedra, corners with two equivalent Fe(9)Sm2Fe10 cuboctahedra,  a cornercorner with one C(3)Sm2Fe4 octahedra,  a cornercorner with one C(4)Sm2Fe4 octahedra,  a faceface with one Fe(5)Sm2Fe9Co cuboctahedra,  a faceface with one Fe(6)Sm2Fe9Co cuboctahedra, faces with two equivalent Fe(9)Sm2Fe10 cuboctahedra,  a faceface with one C(5)Sm2Fe3Co octahedra,  a faceface with one C(6)Sm2Fe3Co octahedra, and faces with two equivalent C(1)Sm2Fe4 octahedra. The corner-sharing octahedral tilt angles are 45°. In the ninth Fe site, Fe(9) is bonded to one Sm(2), one Sm(3), one Fe(12), one Fe(13), one Fe(18), one Fe(2), one Fe(21), one Fe(23), one Fe(24), one Fe(28), one Fe(3), and one Fe(31) atom to form distorted FeSm2Fe10 cuboctahedra that share  a cornercorner with one Fe(5)Sm2Fe9Co cuboctahedra,  a cornercorner with one Fe(6)Sm2Fe9Co cuboctahedra, corners with two equivalent Fe(8)Sm2Fe9Co cuboctahedra,  a cornercorner with one C(5)Sm2Fe3Co octahedra,  a cornercorner with one C(6)Sm2Fe3Co octahedra,  a faceface with one Fe(5)Sm2Fe9Co cuboctahedra,  a faceface with one Fe(6)Sm2Fe9Co cuboctahedra, faces with two equivalent Fe(8)Sm2Fe9Co cuboctahedra,  a faceface with one C(3)Sm2Fe4 octahedra,  a faceface with one C(4)Sm2Fe4 octahedra, and faces with two equivalent C(1)Sm2Fe4 octahedra. The corner-sharing octahedral tilt angles range from 45-46°. In the tenth Fe site, Fe(10) is bonded to one Sm(1), one Sm(4), one Fe(1), one Fe(11), one Fe(14), one Fe(17), one Fe(22), one Fe(25), one Fe(29), one Fe(30), one Fe(4), and one Co(3) atom to form distorted FeSm2Fe9Co cuboctahedra that share  a cornercorner with one Fe(5)Sm2Fe9Co cuboctahedra,  a cornercorner with one Fe(6)Sm2Fe9Co cuboctahedra, corners with two equivalent Fe(7)Sm2Fe8Co2 cuboctahedra,  a cornercorner with one C(5)Sm2Fe3Co octahedra,  a cornercorner with one C(6)Sm2Fe3Co octahedra,  a faceface with one Fe(5)Sm2Fe9Co cuboctahedra,  a faceface with one Fe(6)Sm2Fe9Co cuboctahedra, faces with two equivalent Fe(7)Sm2Fe8Co2 cuboctahedra,  a faceface with one C(3)Sm2Fe4 octahedra,  a faceface with one C(4)Sm2Fe4 octahedra, and faces with two equivalent C(2)Sm2Fe3Co octahedra. The corner-sharing octahedral tilt angles range from 44-45°. In the eleventh Fe site, Fe(11) is bonded in a single-bond geometry to one Fe(1), one Fe(10), one Fe(4), one Fe(7), and one C(2) atom. In the twelfth Fe site, Fe(12) is bonded in a single-bond geometry to one Fe(2), one Fe(3), one Fe(8), one Fe(9), and one C(1) atom. In the thirteenth Fe site, Fe(13) is bonded in a single-bond geometry to one Fe(2), one Fe(3), one Fe(5), one Fe(9), and one C(3) atom. In the fourteenth Fe site, Fe(14) is bonded in a single-bond geometry to one Fe(1), one Fe(10), one Fe(4), one Fe(6), and one C(4) atom. In the fifteenth Fe site, Fe(15) is bonded in a single-bond geometry to one Fe(1), one Fe(4), one Fe(5), one Fe(7), and one C(5) atom. In the sixteenth Fe site, Fe(16) is bonded in a single-bond geometry to one Fe(2), one Fe(3), one Fe(6), one Fe(8), and one C(6) atom. In the seventeenth Fe site, Fe(17) is bonded in a single-bond geometry to one Fe(1), one Fe(10), one Fe(4), one Fe(5), and one C(3) atom. In the eighteenth Fe site, Fe(18) is bonded in a single-bond geometry to one Fe(2), one Fe(3), one Fe(6), one Fe(9), and one C(4) atom. In the nineteenth Fe site, Fe(19) is bonded in a single-bond geometry to one Fe(2), one Fe(3), one Fe(5), one Fe(8), and one C(5) atom. In the twentieth Fe site, Fe(20) is bonded in a single-bond geometry to one Fe(1), one Fe(4), one Fe(6), one Fe(7), and one C(6) atom. In the twenty-first Fe site, Fe(21) is bonded in a single-bond geometry to one Fe(2), one Fe(3), one Fe(8), one Fe(9), and one C(1) atom. In the twenty-second Fe site, Fe(22) is bonded in a single-bond geometry to one Fe(1), one Fe(10), one Fe(4), one Fe(7), and one C(2) atom. In the twenty-third Fe site, Fe(23) is bonded in a single-bond geometry to one Fe(3), one Fe(8), one Fe(9), and one C(1) atom. In the twenty-fourth Fe site, Fe(24) is bonded in a single-bond geometry to one Fe(3), one Fe(5), one Fe(9), and one C(3) atom. In the twenty-fifth Fe site, Fe(25) is bonded in a single-bond geometry to one Fe(10), one Fe(4), one Fe(6), and one C(4) atom. In the twenty-sixth Fe site, Fe(26) is bonded in a single-bond geometry to one Fe(1), one Fe(5), one Fe(7), and one C(5) atom. In the twenty-seventh Fe site, Fe(27) is bonded in a single-bond geometry to one Fe(2), one Fe(6), one Fe(8), and one C(6) atom. In the twenty-eighth Fe site, Fe(28) is bonded in a single-bond geometry to one Fe(2), one Fe(8), one Fe(9), and one C(1) atom. In the twenty-ninth Fe site, Fe(29) is bonded in a single-bond geometry to one Fe(1), one Fe(10), one Fe(7), and one C(2) atom. In the thirtieth Fe site, Fe(30) is bonded in a single-bond geometry to one Fe(1), one Fe(10), one Fe(5), and one C(3) atom. In the thirty-first Fe site, Fe(31) is bonded in a single-bond geometry to one Fe(2), one Fe(6), one Fe(9), and one C(4) atom. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded in a single-bond geometry to one Fe(3), one Fe(5), one Fe(8), and one C(5) atom. In the second Co site, Co(2) is bonded in a single-bond geometry to one Fe(4), one Fe(6), one Fe(7), and one C(6) atom. In the third Co site, Co(3) is bonded in a single-bond geometry to one Fe(10), one Fe(4), one Fe(7), and one C(2) atom. There are six inequivalent C sites. In the first C site, C(1) is bonded to one Sm(2), one Sm(3), one Fe(12), one Fe(21), one Fe(23), and one Fe(28) atom to form CSm2Fe4 octahedra that share  a cornercorner with one Fe(5)Sm2Fe9Co cuboctahedra,  a cornercorner with one Fe(6)Sm2Fe9Co cuboctahedra,  a cornercorner with one C(5)Sm2Fe3Co octahedra,  a cornercorner with one C(6)Sm2Fe3Co octahedra,  a cornercorner with one C(3)Sm2Fe4 octahedra,  a cornercorner with one C(4)Sm2Fe4 octahedra, faces with two equivalent Fe(9)Sm2Fe10 cuboctahedra, and faces with two equivalent Fe(8)Sm2Fe9Co cuboctahedra. The corner-sharing octahedral tilt angles range from 60-61°. In the second C site, C(2) is bonded to one Sm(1), one Sm(4), one Fe(11), one Fe(22), one Fe(29), and one Co(3) atom to form CSm2Fe3Co octahedra that share  a cornercorner with one Fe(5)Sm2Fe9Co cuboctahedra,  a cornercorner with one Fe(6)Sm2Fe9Co cuboctahedra,  a cornercorner with one C(5)Sm2Fe3Co octahedra,  a cornercorner with one C(6)Sm2Fe3Co octahedra,  a cornercorner with one C(3)Sm2Fe4 octahedra,  a cornercorner with one C(4)Sm2Fe4 octahedra, faces with two equivalent Fe(7)Sm2Fe8Co2 cuboctahedra, and faces with two equivalent Fe(10)Sm2Fe9Co cuboctahedra. The corner-sharing octahedral tilt angles range from 60-61°. In the third C site, C(3) is bonded to one Sm(1), one Sm(3), one Fe(13), one Fe(17), one Fe(24), and one Fe(30) atom to form CSm2Fe4 octahedra that share  a cornercorner with one Fe(7)Sm2Fe8Co2 cuboctahedra,  a cornercorner with one Fe(8)Sm2Fe9Co cuboctahedra,  a cornercorner with one C(2)Sm2Fe3Co octahedra,  a cornercorner with one C(1)Sm2Fe4 octahedra, corners with two equivalent C(5)Sm2Fe3Co octahedra,  a faceface with one Fe(9)Sm2Fe10 cuboctahedra,  a faceface with one Fe(10)Sm2Fe9Co cuboctahedra, and faces with two equivalent Fe(5)Sm2Fe9Co cuboctahedra. The corner-sharing octahedral tilt angles range from 60-61°. In the fourth C site, C(4) is bonded to one Sm(2), one Sm(4), one Fe(14), one Fe(18), one Fe(25), and one Fe(31) atom to form CSm2Fe4 octahedra that share  a cornercorner with one Fe(7)Sm2Fe8Co2 cuboctahedra,  a cornercorner with one Fe(8)Sm2Fe9Co cuboctahedra,  a cornercorner with one C(2)Sm2Fe3Co octahedra,  a cornercorner with one C(1)Sm2Fe4 octahedra, corners with two equivalent C(6)Sm2Fe3Co octahedra,  a faceface with one Fe(9)Sm2Fe10 cuboctahedra,  a faceface with one Fe(10)Sm2Fe9Co cuboctahedra, and faces with two equivalent Fe(6)Sm2Fe9Co cuboctahedra. The corner-sharing octahedral tilt angles range from 60-61°. In the fifth C site, C(5) is bonded to one Sm(1), one Sm(3), one Fe(15), one Fe(19), one Fe(26), and one Co(1) atom to form CSm2Fe3Co octahedra that share  a cornercorner with one Fe(9)Sm2Fe10 cuboctahedra,  a cornercorner with one Fe(10)Sm2Fe9Co cuboctahedra,  a cornercorner with one C(2)Sm2Fe3Co octahedra,  a cornercorner with one C(1)Sm2Fe4 octahedra, corners with two equivalent C(3)Sm2Fe4 octahedra,  a faceface with one Fe(7)Sm2Fe8Co2 cuboctahedra,  a faceface with one Fe(8)Sm2Fe9Co cuboctahedra, and faces with two equivalent Fe(5)Sm2Fe9Co cuboctahedra. The corner-sharing octahedral tilt angles range from 60-61°. In the sixth C site, C(6) is bonded to one Sm(2), one Sm(4), one Fe(16), one Fe(20), one Fe(27), and one Co(2) atom to form CSm2Fe3Co octahedra that share  a cornercorner with one Fe(9)Sm2Fe10 cuboctahedra,  a cornercorner with one Fe(10)Sm2Fe9Co cuboctahedra,  a cornercorner with one C(2)Sm2Fe3Co octahedra,  a cornercorner with one C(1)Sm2Fe4 octahedra, corners with two equivalent C(4)Sm2Fe4 octahedra,  a faceface with one Fe(7)Sm2Fe8Co2 cuboctahedra,  a faceface with one Fe(8)Sm2Fe9Co cuboctahedra, and faces with two equivalent Fe(6)Sm2Fe9Co cuboctahedra. The corner-sharing octahedral tilt angles range from 60-61°.
Sm4Fe31(CoC2)3 crystallizes in the triclinic P1 space group. There are four inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(10), one Fe(5), one Fe(7), one C(2), one C(3), and one C(5) atom. The Sm(1)-Fe(1) bond length is 3.10 Å. The Sm(1)-Fe(10) bond length is 3.36 Å. The Sm(1)-Fe(5) bond length is 3.36 Å. The Sm(1)-Fe(7) bond length is 3.35 Å. The Sm(1)-C(2) bond length is 2.51 Å. The Sm(1)-C(3) bond length is 2.52 Å. The Sm(1)-C(5) bond length is 2.52 Å. In the second Sm site, Sm(2) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(6), one Fe(8), one Fe(9), one C(1), one C(4), and one C(6) atom. The Sm(2)-Fe(2) bond length is 3.11 Å. The Sm(2)-Fe(6) bond length is 3.36 Å. The Sm(2)-Fe(8) bond length is 3.35 Å. The Sm(2)-Fe(9) bond length is 3.36 Å. The Sm(2)-C(1) bond length is 2.52 Å. The Sm(2)-C(4) bond length is 2.52 Å. The Sm(2)-C(6) bond length is 2.51 Å. In the third Sm site, Sm(3) is bonded in a distorted trigonal planar geometry to one Fe(3), one Fe(5), one Fe(8), one Fe(9), one C(1), one C(3), and one C(5) atom. The Sm(3)-Fe(3) bond length is 3.14 Å. The Sm(3)-Fe(5) bond length is 3.36 Å. The Sm(3)-Fe(8) bond length is 3.37 Å. The Sm(3)-Fe(9) bond length is 3.36 Å. The Sm(3)-C(1) bond length is 2.51 Å. The Sm(3)-C(3) bond length is 2.50 Å. The Sm(3)-C(5) bond length is 2.51 Å. In the fourth Sm site, Sm(4) is bonded in a distorted trigonal planar geometry to one Fe(10), one Fe(4), one Fe(6), one Fe(7), one C(2), one C(4), and one C(6) atom. The Sm(4)-Fe(10) bond length is 3.34 Å. The Sm(4)-Fe(4) bond length is 3.12 Å. The Sm(4)-Fe(6) bond length is 3.36 Å. The Sm(4)-Fe(7) bond length is 3.35 Å. The Sm(4)-C(2) bond length is 2.50 Å. The Sm(4)-C(4) bond length is 2.51 Å. The Sm(4)-C(6) bond length is 2.51 Å. There are thirty-one inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 14-coordinate geometry to one Sm(1), one Fe(10), one Fe(11), one Fe(14), one Fe(15), one Fe(17), one Fe(20), one Fe(22), one Fe(26), one Fe(29), one Fe(30), one Fe(4), one Fe(5), and one Fe(7) atom. The Fe(1)-Fe(10) bond length is 2.66 Å. The Fe(1)-Fe(11) bond length is 2.72 Å. The Fe(1)-Fe(14) bond length is 2.74 Å. The Fe(1)-Fe(15) bond length is 2.75 Å. The Fe(1)-Fe(17) bond length is 2.74 Å. The Fe(1)-Fe(20) bond length is 2.73 Å. The Fe(1)-Fe(22) bond length is 2.74 Å. The Fe(1)-Fe(26) bond length is 2.66 Å. The Fe(1)-Fe(29) bond length is 2.66 Å. The Fe(1)-Fe(30) bond length is 2.65 Å. The Fe(1)-Fe(4) bond length is 2.38 Å. The Fe(1)-Fe(5) bond length is 2.67 Å. The Fe(1)-Fe(7) bond length is 2.66 Å. In the second Fe site, Fe(2) is bonded in a 14-coordinate geometry to one Sm(2), one Fe(12), one Fe(13), one Fe(16), one Fe(18), one Fe(19), one Fe(21), one Fe(27), one Fe(28), one Fe(3), one Fe(31), one Fe(6), one Fe(8), and one Fe(9) atom. The Fe(2)-Fe(12) bond length is 2.72 Å. The Fe(2)-Fe(13) bond length is 2.75 Å. The Fe(2)-Fe(16) bond length is 2.74 Å. The Fe(2)-Fe(18) bond length is 2.74 Å. The Fe(2)-Fe(19) bond length is 2.74 Å. The Fe(2)-Fe(21) bond length is 2.75 Å. The Fe(2)-Fe(27) bond length is 2.66 Å. The Fe(2)-Fe(28) bond length is 2.65 Å. The Fe(2)-Fe(3) bond length is 2.38 Å. The Fe(2)-Fe(31) bond length is 2.65 Å. The Fe(2)-Fe(6) bond length is 2.66 Å. The Fe(2)-Fe(8) bond length is 2.66 Å. The Fe(2)-Fe(9) bond length is 2.66 Å. In the third Fe site, Fe(3) is bonded in a 14-coordinate geometry to one Sm(3), one Fe(12), one Fe(13), one Fe(16), one Fe(18), one Fe(19), one Fe(2), one Fe(21), one Fe(23), one Fe(24), one Fe(5), one Fe(8), one Fe(9), and one Co(1) atom. The Fe(3)-Fe(12) bond length is 2.74 Å. The Fe(3)-Fe(13) bond length is 2.73 Å. The Fe(3)-Fe(16) bond length is 2.73 Å. The Fe(3)-Fe(18) bond length is 2.75 Å. The Fe(3)-Fe(19) bond length is 2.74 Å. The Fe(3)-Fe(21) bond length is 2.72 Å. The Fe(3)-Fe(23) bond length is 2.66 Å. The Fe(3)-Fe(24) bond length is 2.66 Å. The Fe(3)-Fe(5) bond length is 2.66 Å. The Fe(3)-Fe(8) bond length is 2.66 Å. The Fe(3)-Fe(9) bond length is 2.66 Å. The Fe(3)-Co(1) bond length is 2.65 Å. In the fourth Fe site, Fe(4) is bonded in a 14-coordinate geometry to one Sm(4), one Fe(1), one Fe(10), one Fe(11), one Fe(14), one Fe(15), one Fe(17), one Fe(20), one Fe(22), one Fe(25), one Fe(6), one Fe(7), one Co(2), and one Co(3) atom. The Fe(4)-Fe(10) bond length is 2.66 Å. The Fe(4)-Fe(11) bond length is 2.73 Å. The Fe(4)-Fe(14) bond length is 2.73 Å. The Fe(4)-Fe(15) bond length is 2.72 Å. The Fe(4)-Fe(17) bond length is 2.73 Å. The Fe(4)-Fe(20) bond length is 2.73 Å. The Fe(4)-Fe(22) bond length is 2.71 Å. The Fe(4)-Fe(25) bond length is 2.66 Å. The Fe(4)-Fe(6) bond length is 2.67 Å. The Fe(4)-Fe(7) bond length is 2.66 Å. The Fe(4)-Co(2) bond length is 2.65 Å. The Fe(4)-Co(3) bond length is 2.66 Å. In the fifth Fe site, Fe(5) is bonded to one Sm(1), one Sm(3), one Fe(1), one Fe(13), one Fe(15), one Fe(17), one Fe(19), one Fe(24), one Fe(26), one Fe(3), one Fe(30), and one Co(1) atom to form distorted FeSm2Fe9Co cuboctahedra that share  a cornercorner with one Fe(9)Sm2Fe10 cuboctahedra,  a cornercorner with one Fe(7)Sm2Fe8Co2 cuboctahedra,  a cornercorner with one Fe(10)Sm2Fe9Co cuboctahedra,  a cornercorner with one Fe(8)Sm2Fe9Co cuboctahedra,  a cornercorner with one C(2)Sm2Fe3Co octahedra,  a cornercorner with one C(1)Sm2Fe4 octahedra,  a faceface with one Fe(9)Sm2Fe10 cuboctahedra,  a faceface with one Fe(7)Sm2Fe8Co2 cuboctahedra,  a faceface with one Fe(10)Sm2Fe9Co cuboctahedra,  a faceface with one Fe(8)Sm2Fe9Co cuboctahedra, faces with two equivalent C(5)Sm2Fe3Co octahedra, and faces with two equivalent C(3)Sm2Fe4 octahedra. The corner-sharing octahedral tilt angles are 45°. The Fe(5)-Fe(13) bond length is 2.44 Å. The Fe(5)-Fe(15) bond length is 2.44 Å. The Fe(5)-Fe(17) bond length is 2.44 Å. The Fe(5)-Fe(19) bond length is 2.45 Å. The Fe(5)-Fe(24) bond length is 2.48 Å. The Fe(5)-Fe(26) bond length is 2.49 Å. The Fe(5)-Fe(30) bond length is 2.47 Å. The Fe(5)-Co(1) bond length is 2.47 Å. In the sixth Fe site, Fe(6) is bonded to one Sm(2), one Sm(4), one Fe(14), one Fe(16), one Fe(18), one Fe(2), one Fe(20), one Fe(25), one Fe(27), one Fe(31), one Fe(4), and one Co(2) atom to form distorted FeSm2Fe9Co cuboctahedra that share  a cornercorner with one Fe(9)Sm2Fe10 cuboctahedra,  a cornercorner with one Fe(7)Sm2Fe8Co2 cuboctahedra,  a cornercorner with one Fe(10)Sm2Fe9Co cuboctahedra,  a cornercorner with one Fe(8)Sm2Fe9Co cuboctahedra,  a cornercorner with one C(2)Sm2Fe3Co octahedra,  a cornercorner with one C(1)Sm2Fe4 octahedra,  a faceface with one Fe(9)Sm2Fe10 cuboctahedra,  a faceface with one Fe(7)Sm2Fe8Co2 cuboctahedra,  a faceface with one Fe(10)Sm2Fe9Co cuboctahedra,  a faceface with one Fe(8)Sm2Fe9Co cuboctahedra, faces with two equivalent C(6)Sm2Fe3Co octahedra, and faces with two equivalent C(4)Sm2Fe4 octahedra. The corner-sharing octahedral tilt angles are 45°. The Fe(6)-Fe(14) bond length is 2.44 Å. The Fe(6)-Fe(16) bond length is 2.45 Å. The Fe(6)-Fe(18) bond length is 2.44 Å. The Fe(6)-Fe(20) bond length is 2.45 Å. The Fe(6)-Fe(25) bond length is 2.48 Å. The Fe(6)-Fe(27) bond length is 2.49 Å. The Fe(6)-Fe(31) bond length is 2.47 Å. The Fe(6)-Co(2) bond length is 2.47 Å. In the seventh Fe site, Fe(7) is bonded to one Sm(1), one Sm(4), one Fe(1), one Fe(11), one Fe(15), one Fe(20), one Fe(22), one Fe(26), one Fe(29), one Fe(4), one Co(2), and one Co(3) atom to form distorted FeSm2Fe8Co2 cuboctahedra that share  a cornercorner with one Fe(5)Sm2Fe9Co cuboctahedra,  a cornercorner with one Fe(6)Sm2Fe9Co cuboctahedra, corners with two equivalent Fe(10)Sm2Fe9Co cuboctahedra,  a cornercorner with one C(3)Sm2Fe4 octahedra,  a cornercorner with one C(4)Sm2Fe4 octahedra,  a faceface with one Fe(5)Sm2Fe9Co cuboctahedra,  a faceface with one Fe(6)Sm2Fe9Co cuboctahedra, faces with two equivalent Fe(10)Sm2Fe9Co cuboctahedra,  a faceface with one C(5)Sm2Fe3Co octahedra,  a faceface with one C(6)Sm2Fe3Co octahedra, and faces with two equivalent C(2)Sm2Fe3Co octahedra. The corner-sharing octahedral tilt angles are 45°. The Fe(7)-Fe(11) bond length is 2.44 Å. The Fe(7)-Fe(15) bond length is 2.45 Å. The Fe(7)-Fe(20) bond length is 2.45 Å. The Fe(7)-Fe(22) bond length is 2.44 Å. The Fe(7)-Fe(26) bond length is 2.49 Å. The Fe(7)-Fe(29) bond length is 2.48 Å. The Fe(7)-Co(2) bond length is 2.47 Å. The Fe(7)-Co(3) bond length is 2.47 Å. In the eighth Fe site, Fe(8) is bonded to one Sm(2), one Sm(3), one Fe(12), one Fe(16), one Fe(19), one Fe(2), one Fe(21), one Fe(23), one Fe(27), one Fe(28), one Fe(3), and one Co(1) atom to form distorted FeSm2Fe9Co cuboctahedra that share  a cornercorner with one Fe(5)Sm2Fe9Co cuboctahedra,  a cornercorner with one Fe(6)Sm2Fe9Co cuboctahedra, corners with two equivalent Fe(9)Sm2Fe10 cuboctahedra,  a cornercorner with one C(3)Sm2Fe4 octahedra,  a cornercorner with one C(4)Sm2Fe4 octahedra,  a faceface with one Fe(5)Sm2Fe9Co cuboctahedra,  a faceface with one Fe(6)Sm2Fe9Co cuboctahedra, faces with two equivalent Fe(9)Sm2Fe10 cuboctahedra,  a faceface with one C(5)Sm2Fe3Co octahedra,  a faceface with one C(6)Sm2Fe3Co octahedra, and faces with two equivalent C(1)Sm2Fe4 octahedra. The corner-sharing octahedral tilt angles are 45°. The Fe(8)-Fe(12) bond length is 2.45 Å. The Fe(8)-Fe(16) bond length is 2.45 Å. The Fe(8)-Fe(19) bond length is 2.45 Å. The Fe(8)-Fe(21) bond length is 2.45 Å. The Fe(8)-Fe(23) bond length is 2.48 Å. The Fe(8)-Fe(27) bond length is 2.49 Å. The Fe(8)-Fe(28) bond length is 2.47 Å. The Fe(8)-Co(1) bond length is 2.47 Å. In the ninth Fe site, Fe(9) is bonded to one Sm(2), one Sm(3), one Fe(12), one Fe(13), one Fe(18), one Fe(2), one Fe(21), one Fe(23), one Fe(24), one Fe(28), one Fe(3), and one Fe(31) atom to form distorted FeSm2Fe10 cuboctahedra that share  a cornercorner with one Fe(5)Sm2Fe9Co cuboctahedra,  a cornercorner with one Fe(6)Sm2Fe9Co cuboctahedra, corners with two equivalent Fe(8)Sm2Fe9Co cuboctahedra,  a cornercorner with one C(5)Sm2Fe3Co octahedra,  a cornercorner with one C(6)Sm2Fe3Co octahedra,  a faceface with one Fe(5)Sm2Fe9Co cuboctahedra,  a faceface with one Fe(6)Sm2Fe9Co cuboctahedra, faces with two equivalent Fe(8)Sm2Fe9Co cuboctahedra,  a faceface with one C(3)Sm2Fe4 octahedra,  a faceface with one C(4)Sm2Fe4 octahedra, and faces with two equivalent C(1)Sm2Fe4 octahedra. The corner-sharing octahedral tilt angles range from 45-46°. The Fe(9)-Fe(12) bond length is 2.45 Å. The Fe(9)-Fe(13) bond length is 2.45 Å. The Fe(9)-Fe(18) bond length is 2.45 Å. The Fe(9)-Fe(21) bond length is 2.45 Å. The Fe(9)-Fe(23) bond length is 2.48 Å. The Fe(9)-Fe(24) bond length is 2.48 Å. The Fe(9)-Fe(28) bond length is 2.48 Å. The Fe(9)-Fe(31) bond length is 2.48 Å. In the tenth Fe site, Fe(10) is bonded to one Sm(1), one Sm(4), one Fe(1), one Fe(11), one Fe(14), one Fe(17), one Fe(22), one Fe(25), one Fe(29), one Fe(30), one Fe(4), and one Co(3) atom to form distorted FeSm2Fe9Co cuboctahedra that share  a cornercorner with one Fe(5)Sm2Fe9Co cuboctahedra,  a cornercorner with one Fe(6)Sm2Fe9Co cuboctahedra, corners with two equivalent Fe(7)Sm2Fe8Co2 cuboctahedra,  a cornercorner with one C(5)Sm2Fe3Co octahedra,  a cornercorner with one C(6)Sm2Fe3Co octahedra,  a faceface with one Fe(5)Sm2Fe9Co cuboctahedra,  a faceface with one Fe(6)Sm2Fe9Co cuboctahedra, faces with two equivalent Fe(7)Sm2Fe8Co2 cuboctahedra,  a faceface with one C(3)Sm2Fe4 octahedra,  a faceface with one C(4)Sm2Fe4 octahedra, and faces with two equivalent C(2)Sm2Fe3Co octahedra. The corner-sharing octahedral tilt angles range from 44-45°. The Fe(10)-Fe(11) bond length is 2.45 Å. The Fe(10)-Fe(14) bond length is 2.44 Å. The Fe(10)-Fe(17) bond length is 2.45 Å. The Fe(10)-Fe(22) bond length is 2.45 Å. The Fe(10)-Fe(25) bond length is 2.47 Å. The Fe(10)-Fe(29) bond length is 2.48 Å. The Fe(10)-Fe(30) bond length is 2.48 Å. The Fe(10)-Co(3) bond length is 2.47 Å. In the eleventh Fe site, Fe(11) is bonded in a single-bond geometry to one Fe(1), one Fe(10), one Fe(4), one Fe(7), and one C(2) atom. The Fe(11)-C(2) bond length is 1.89 Å. In the twelfth Fe site, Fe(12) is bonded in a single-bond geometry to one Fe(2), one Fe(3), one Fe(8), one Fe(9), and one C(1) atom. The Fe(12)-C(1) bond length is 1.88 Å. In the thirteenth Fe site, Fe(13) is bonded in a single-bond geometry to one Fe(2), one Fe(3), one Fe(5), one Fe(9), and one C(3) atom. The Fe(13)-C(3) bond length is 1.88 Å. In the fourteenth Fe site, Fe(14) is bonded in a single-bond geometry to one Fe(1), one Fe(10), one Fe(4), one Fe(6), and one C(4) atom. The Fe(14)-C(4) bond length is 1.88 Å. In the fifteenth Fe site, Fe(15) is bonded in a single-bond geometry to one Fe(1), one Fe(4), one Fe(5), one Fe(7), and one C(5) atom. The Fe(15)-C(5) bond length is 1.89 Å. In the sixteenth Fe site, Fe(16) is bonded in a single-bond geometry to one Fe(2), one Fe(3), one Fe(6), one Fe(8), and one C(6) atom. The Fe(16)-C(6) bond length is 1.89 Å. In the seventeenth Fe site, Fe(17) is bonded in a single-bond geometry to one Fe(1), one Fe(10), one Fe(4), one Fe(5), and one C(3) atom. The Fe(17)-C(3) bond length is 1.88 Å. In the eighteenth Fe site, Fe(18) is bonded in a single-bond geometry to one Fe(2), one Fe(3), one Fe(6), one Fe(9), and one C(4) atom. The Fe(18)-C(4) bond length is 1.88 Å. In the nineteenth Fe site, Fe(19) is bonded in a single-bond geometry to one Fe(2), one Fe(3), one Fe(5), one Fe(8), and one C(5) atom. The Fe(19)-C(5) bond length is 1.89 Å. In the twentieth Fe site, Fe(20) is bonded in a single-bond geometry to one Fe(1), one Fe(4), one Fe(6), one Fe(7), and one C(6) atom. The Fe(20)-C(6) bond length is 1.89 Å. In the twenty-first Fe site, Fe(21) is bonded in a single-bond geometry to one Fe(2), one Fe(3), one Fe(8), one Fe(9), and one C(1) atom. The Fe(21)-C(1) bond length is 1.88 Å. In the twenty-second Fe site, Fe(22) is bonded in a single-bond geometry to one Fe(1), one Fe(10), one Fe(4), one Fe(7), and one C(2) atom. The Fe(22)-C(2) bond length is 1.89 Å. In the twenty-third Fe site, Fe(23) is bonded in a single-bond geometry to one Fe(3), one Fe(8), one Fe(9), and one C(1) atom. The Fe(23)-C(1) bond length is 1.91 Å. In the twenty-fourth Fe site, Fe(24) is bonded in a single-bond geometry to one Fe(3), one Fe(5), one Fe(9), and one C(3) atom. The Fe(24)-C(3) bond length is 1.91 Å. In the twenty-fifth Fe site, Fe(25) is bonded in a single-bond geometry to one Fe(10), one Fe(4), one Fe(6), and one C(4) atom. The Fe(25)-C(4) bond length is 1.91 Å. In the twenty-sixth Fe site, Fe(26) is bonded in a single-bond geometry to one Fe(1), one Fe(5), one Fe(7), and one C(5) atom. The Fe(26)-C(5) bond length is 1.91 Å. In the twenty-seventh Fe site, Fe(27) is bonded in a single-bond geometry to one Fe(2), one Fe(6), one Fe(8), and one C(6) atom. The Fe(27)-C(6) bond length is 1.90 Å. In the twenty-eighth Fe site, Fe(28) is bonded in a single-bond geometry to one Fe(2), one Fe(8), one Fe(9), and one C(1) atom. The Fe(28)-C(1) bond length is 1.92 Å. In the twenty-ninth Fe site, Fe(29) is bonded in a single-bond geometry to one Fe(1), one Fe(10), one Fe(7), and one C(2) atom. The Fe(29)-C(2) bond length is 1.90 Å. In the thirtieth Fe site, Fe(30) is bonded in a single-bond geometry to one Fe(1), one Fe(10), one Fe(5), and one C(3) atom. The Fe(30)-C(3) bond length is 1.92 Å. In the thirty-first Fe site, Fe(31) is bonded in a single-bond geometry to one Fe(2), one Fe(6), one Fe(9), and one C(4) atom. The Fe(31)-C(4) bond length is 1.92 Å. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded in a single-bond geometry to one Fe(3), one Fe(5), one Fe(8), and one C(5) atom. The Co(1)-C(5) bond length is 1.88 Å. In the second Co site, Co(2) is bonded in a single-bond geometry to one Fe(4), one Fe(6), one Fe(7), and one C(6) atom. The Co(2)-C(6) bond length is 1.88 Å. In the third Co site, Co(3) is bonded in a single-bond geometry to one Fe(10), one Fe(4), one Fe(7), and one C(2) atom. The Co(3)-C(2) bond length is 1.87 Å. There are six inequivalent C sites. In the first C site, C(1) is bonded to one Sm(2), one Sm(3), one Fe(12), one Fe(21), one Fe(23), and one Fe(28) atom to form CSm2Fe4 octahedra that share  a cornercorner with one Fe(5)Sm2Fe9Co cuboctahedra,  a cornercorner with one Fe(6)Sm2Fe9Co cuboctahedra,  a cornercorner with one C(5)Sm2Fe3Co octahedra,  a cornercorner with one C(6)Sm2Fe3Co octahedra,  a cornercorner with one C(3)Sm2Fe4 octahedra,  a cornercorner with one C(4)Sm2Fe4 octahedra, faces with two equivalent Fe(9)Sm2Fe10 cuboctahedra, and faces with two equivalent Fe(8)Sm2Fe9Co cuboctahedra. The corner-sharing octahedral tilt angles range from 60-61°. In the second C site, C(2) is bonded to one Sm(1), one Sm(4), one Fe(11), one Fe(22), one Fe(29), and one Co(3) atom to form CSm2Fe3Co octahedra that share  a cornercorner with one Fe(5)Sm2Fe9Co cuboctahedra,  a cornercorner with one Fe(6)Sm2Fe9Co cuboctahedra,  a cornercorner with one C(5)Sm2Fe3Co octahedra,  a cornercorner with one C(6)Sm2Fe3Co octahedra,  a cornercorner with one C(3)Sm2Fe4 octahedra,  a cornercorner with one C(4)Sm2Fe4 octahedra, faces with two equivalent Fe(7)Sm2Fe8Co2 cuboctahedra, and faces with two equivalent Fe(10)Sm2Fe9Co cuboctahedra. The corner-sharing octahedral tilt angles range from 60-61°. In the third C site, C(3) is bonded to one Sm(1), one Sm(3), one Fe(13), one Fe(17), one Fe(24), and one Fe(30) atom to form CSm2Fe4 octahedra that share  a cornercorner with one Fe(7)Sm2Fe8Co2 cuboctahedra,  a cornercorner with one Fe(8)Sm2Fe9Co cuboctahedra,  a cornercorner with one C(2)Sm2Fe3Co octahedra,  a cornercorner with one C(1)Sm2Fe4 octahedra, corners with two equivalent C(5)Sm2Fe3Co octahedra,  a faceface with one Fe(9)Sm2Fe10 cuboctahedra,  a faceface with one Fe(10)Sm2Fe9Co cuboctahedra, and faces with two equivalent Fe(5)Sm2Fe9Co cuboctahedra. The corner-sharing octahedral tilt angles range from 60-61°. In the fourth C site, C(4) is bonded to one Sm(2), one Sm(4), one Fe(14), one Fe(18), one Fe(25), and one Fe(31) atom to form CSm2Fe4 octahedra that share  a cornercorner with one Fe(7)Sm2Fe8Co2 cuboctahedra,  a cornercorner with one Fe(8)Sm2Fe9Co cuboctahedra,  a cornercorner with one C(2)Sm2Fe3Co octahedra,  a cornercorner with one C(1)Sm2Fe4 octahedra, corners with two equivalent C(6)Sm2Fe3Co octahedra,  a faceface with one Fe(9)Sm2Fe10 cuboctahedra,  a faceface with one Fe(10)Sm2Fe9Co cuboctahedra, and faces with two equivalent Fe(6)Sm2Fe9Co cuboctahedra. The corner-sharing octahedral tilt angles range from 60-61°. In the fifth C site, C(5) is bonded to one Sm(1), one Sm(3), one Fe(15), one Fe(19), one Fe(26), and one Co(1) atom to form CSm2Fe3Co octahedra that share  a cornercorner with one Fe(9)Sm2Fe10 cuboctahedra,  a cornercorner with one Fe(10)Sm2Fe9Co cuboctahedra,  a cornercorner with one C(2)Sm2Fe3Co octahedra,  a cornercorner with one C(1)Sm2Fe4 octahedra, corners with two equivalent C(3)Sm2Fe4 octahedra,  a faceface with one Fe(7)Sm2Fe8Co2 cuboctahedra,  a faceface with one Fe(8)Sm2Fe9Co cuboctahedra, and faces with two equivalent Fe(5)Sm2Fe9Co cuboctahedra. The corner-sharing octahedral tilt angles range from 60-61°. In the sixth C site, C(6) is bonded to one Sm(2), one Sm(4), one Fe(16), one Fe(20), one Fe(27), and one Co(2) atom to form CSm2Fe3Co octahedra that share  a cornercorner with one Fe(9)Sm2Fe10 cuboctahedra,  a cornercorner with one Fe(10)Sm2Fe9Co cuboctahedra,  a cornercorner with one C(2)Sm2Fe3Co octahedra,  a cornercorner with one C(1)Sm2Fe4 octahedra, corners with two equivalent C(4)Sm2Fe4 octahedra,  a faceface with one Fe(7)Sm2Fe8Co2 cuboctahedra,  a faceface with one Fe(8)Sm2Fe9Co cuboctahedra, and faces with two equivalent Fe(6)Sm2Fe9Co cuboctahedra. The corner-sharing octahedral tilt angles range from 60-61°.