Dy2Fe15Si2CN crystallizes in the triclinic P-1 space group. Dy(1) is bonded in a distorted bent 120 degrees geometry to one Fe(4), one Fe(5), one Fe(6), two equivalent Fe(9), three equivalent Fe(3), one Si(1), one C(1), and one N(1) atom. There are nine inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a single-bond geometry to one Fe(3), one Fe(5), one Fe(6), one Fe(9), one Si(1), and one C(1) atom. In the second Fe site, Fe(2) is bonded in a single-bond geometry to one Fe(3), one Fe(4), one Fe(6), one Fe(9), one Si(1), and one N(1) atom. In the third Fe site, Fe(3) is bonded to three equivalent Dy(1), one Fe(1), one Fe(2), one Fe(4), one Fe(5), one Fe(7), one Fe(8), two equivalent Fe(9), and one Si(1) atom to form FeDy3Fe8Si cuboctahedra that share  a cornercorner with one Fe(4)Dy2Fe8Si2 cuboctahedra,  a cornercorner with one Fe(5)Dy2Fe8Si2 cuboctahedra, corners with two equivalent Fe(9)Dy2Fe8Si2 cuboctahedra, corners with three equivalent Fe(6)Dy2Fe8Si2 cuboctahedra, corners with four equivalent Fe(3)Dy3Fe8Si cuboctahedra, corners with two equivalent C(1)Dy2Fe4 octahedra, corners with two equivalent N(1)Dy2Fe4 octahedra,  an edgeedge with one Fe(4)Dy2Fe8Si2 cuboctahedra,  an edgeedge with one Fe(5)Dy2Fe8Si2 cuboctahedra,  an edgeedge with one Fe(6)Dy2Fe8Si2 cuboctahedra,  an edgeedge with one Fe(3)Dy3Fe8Si cuboctahedra,  a faceface with one Fe(4)Dy2Fe8Si2 cuboctahedra,  a faceface with one Fe(5)Dy2Fe8Si2 cuboctahedra,  a faceface with one Fe(6)Dy2Fe8Si2 cuboctahedra,  a faceface with one Fe(3)Dy3Fe8Si cuboctahedra, faces with four equivalent Fe(9)Dy2Fe8Si2 cuboctahedra,  a faceface with one C(1)Dy2Fe4 octahedra, and  a faceface with one N(1)Dy2Fe4 octahedra. The corner-sharing octahedral tilt angles range from 63-71°. In the fourth Fe site, Fe(4) is bonded to two equivalent Dy(1), two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(8), two equivalent Fe(9), and two equivalent Si(1) atoms to form distorted FeDy2Fe8Si2 cuboctahedra that share corners with two equivalent Fe(5)Dy2Fe8Si2 cuboctahedra, corners with two equivalent Fe(6)Dy2Fe8Si2 cuboctahedra, corners with two equivalent Fe(9)Dy2Fe8Si2 cuboctahedra, corners with two equivalent Fe(3)Dy3Fe8Si cuboctahedra, corners with two equivalent C(1)Dy2Fe4 octahedra, edges with two equivalent Fe(9)Dy2Fe8Si2 cuboctahedra, edges with two equivalent Fe(3)Dy3Fe8Si cuboctahedra, faces with two equivalent Fe(5)Dy2Fe8Si2 cuboctahedra, faces with two equivalent Fe(6)Dy2Fe8Si2 cuboctahedra, faces with two equivalent Fe(9)Dy2Fe8Si2 cuboctahedra, faces with two equivalent Fe(3)Dy3Fe8Si cuboctahedra, and faces with two equivalent N(1)Dy2Fe4 octahedra. The corner-sharing octahedral tilt angles are 46°. In the fifth Fe site, Fe(5) is bonded to two equivalent Dy(1), two equivalent Fe(1), two equivalent Fe(3), two equivalent Fe(7), two equivalent Fe(9), and two equivalent Si(1) atoms to form distorted FeDy2Fe8Si2 cuboctahedra that share corners with two equivalent Fe(4)Dy2Fe8Si2 cuboctahedra, corners with two equivalent Fe(6)Dy2Fe8Si2 cuboctahedra, corners with two equivalent Fe(9)Dy2Fe8Si2 cuboctahedra, corners with two equivalent Fe(3)Dy3Fe8Si cuboctahedra, corners with two equivalent N(1)Dy2Fe4 octahedra, edges with two equivalent Fe(9)Dy2Fe8Si2 cuboctahedra, edges with two equivalent Fe(3)Dy3Fe8Si cuboctahedra, faces with two equivalent Fe(4)Dy2Fe8Si2 cuboctahedra, faces with two equivalent Fe(6)Dy2Fe8Si2 cuboctahedra, faces with two equivalent Fe(9)Dy2Fe8Si2 cuboctahedra, faces with two equivalent Fe(3)Dy3Fe8Si cuboctahedra, and faces with two equivalent C(1)Dy2Fe4 octahedra. The corner-sharing octahedral tilt angles are 45°. In the sixth Fe site, Fe(6) is bonded to two equivalent Dy(1), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(7), two equivalent Fe(8), and two equivalent Si(1) atoms to form distorted FeDy2Fe8Si2 cuboctahedra that share corners with two equivalent Fe(4)Dy2Fe8Si2 cuboctahedra, corners with two equivalent Fe(5)Dy2Fe8Si2 cuboctahedra, corners with four equivalent Fe(9)Dy2Fe8Si2 cuboctahedra, corners with six equivalent Fe(3)Dy3Fe8Si cuboctahedra, edges with two equivalent Fe(3)Dy3Fe8Si cuboctahedra, faces with two equivalent Fe(4)Dy2Fe8Si2 cuboctahedra, faces with two equivalent Fe(5)Dy2Fe8Si2 cuboctahedra, faces with two equivalent Fe(3)Dy3Fe8Si cuboctahedra, faces with four equivalent Fe(9)Dy2Fe8Si2 cuboctahedra, faces with two equivalent C(1)Dy2Fe4 octahedra, and faces with two equivalent N(1)Dy2Fe4 octahedra. In the seventh Fe site, Fe(7) is bonded in a single-bond geometry to one Fe(3), one Fe(5), one Fe(6), one Fe(9), two equivalent Si(1), and one C(1) atom. In the eighth Fe site, Fe(8) is bonded in a single-bond geometry to one Fe(3), one Fe(4), one Fe(6), one Fe(9), two equivalent Si(1), and one N(1) atom. In the ninth Fe site, Fe(9) is bonded to two equivalent Dy(1), one Fe(1), one Fe(2), one Fe(4), one Fe(5), one Fe(7), one Fe(8), two equivalent Fe(3), and two equivalent Si(1) atoms to form distorted FeDy2Fe8Si2 cuboctahedra that share  a cornercorner with one Fe(4)Dy2Fe8Si2 cuboctahedra,  a cornercorner with one Fe(5)Dy2Fe8Si2 cuboctahedra, corners with two equivalent Fe(6)Dy2Fe8Si2 cuboctahedra, corners with two equivalent Fe(9)Dy2Fe8Si2 cuboctahedra, corners with two equivalent Fe(3)Dy3Fe8Si cuboctahedra, corners with two equivalent C(1)Dy2Fe4 octahedra, corners with two equivalent N(1)Dy2Fe4 octahedra,  an edgeedge with one Fe(4)Dy2Fe8Si2 cuboctahedra,  an edgeedge with one Fe(5)Dy2Fe8Si2 cuboctahedra,  an edgeedge with one Fe(9)Dy2Fe8Si2 cuboctahedra,  an edgeedge with one C(1)Dy2Fe4 octahedra,  an edgeedge with one N(1)Dy2Fe4 octahedra,  a faceface with one Fe(4)Dy2Fe8Si2 cuboctahedra,  a faceface with one Fe(5)Dy2Fe8Si2 cuboctahedra,  a faceface with one Fe(9)Dy2Fe8Si2 cuboctahedra, faces with two equivalent Fe(6)Dy2Fe8Si2 cuboctahedra, and faces with four equivalent Fe(3)Dy3Fe8Si cuboctahedra. The corner-sharing octahedral tilt angles range from 24-29°. Si(1) is bonded in a 14-coordinate geometry to one Dy(1), one Fe(1), one Fe(2), one Fe(3), one Fe(4), one Fe(5), one Fe(6), two equivalent Fe(7), two equivalent Fe(8), two equivalent Fe(9), and one Si(1) atom. C(1) is bonded to two equivalent Dy(1), two equivalent Fe(1), and two equivalent Fe(7) atoms to form CDy2Fe4 octahedra that share corners with two equivalent Fe(4)Dy2Fe8Si2 cuboctahedra, corners with four equivalent Fe(9)Dy2Fe8Si2 cuboctahedra, corners with four equivalent Fe(3)Dy3Fe8Si cuboctahedra, corners with two equivalent N(1)Dy2Fe4 octahedra, edges with two equivalent Fe(9)Dy2Fe8Si2 cuboctahedra, faces with two equivalent Fe(5)Dy2Fe8Si2 cuboctahedra, faces with two equivalent Fe(6)Dy2Fe8Si2 cuboctahedra, and faces with two equivalent Fe(3)Dy3Fe8Si cuboctahedra. The corner-sharing octahedral tilt angles are 61°. N(1) is bonded to two equivalent Dy(1), two equivalent Fe(2), and two equivalent Fe(8) atoms to form NDy2Fe4 octahedra that share corners with two equivalent Fe(5)Dy2Fe8Si2 cuboctahedra, corners with four equivalent Fe(9)Dy2Fe8Si2 cuboctahedra, corners with four equivalent Fe(3)Dy3Fe8Si cuboctahedra, corners with two equivalent C(1)Dy2Fe4 octahedra, edges with two equivalent Fe(9)Dy2Fe8Si2 cuboctahedra, faces with two equivalent Fe(4)Dy2Fe8Si2 cuboctahedra, faces with two equivalent Fe(6)Dy2Fe8Si2 cuboctahedra, and faces with two equivalent Fe(3)Dy3Fe8Si cuboctahedra. The corner-sharing octahedral tilt angles are 61°.
Dy2Fe15Si2CN crystallizes in the triclinic P-1 space group. Dy(1) is bonded in a distorted bent 120 degrees geometry to one Fe(4), one Fe(5), one Fe(6), two equivalent Fe(9), three equivalent Fe(3), one Si(1), one C(1), and one N(1) atom. The Dy(1)-Fe(4) bond length is 3.29 Å. The Dy(1)-Fe(5) bond length is 3.34 Å. The Dy(1)-Fe(6) bond length is 3.34 Å. There is one shorter (3.02 Å) and one longer (3.04 Å) Dy(1)-Fe(9) bond length. There are a spread of Dy(1)-Fe(3) bond distances ranging from 3.08-3.31 Å. The Dy(1)-Si(1) bond length is 3.06 Å. The Dy(1)-C(1) bond length is 2.51 Å. The Dy(1)-N(1) bond length is 2.43 Å. There are nine inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a single-bond geometry to one Fe(3), one Fe(5), one Fe(6), one Fe(9), one Si(1), and one C(1) atom. The Fe(1)-Fe(3) bond length is 2.51 Å. The Fe(1)-Fe(5) bond length is 2.44 Å. The Fe(1)-Fe(6) bond length is 2.46 Å. The Fe(1)-Fe(9) bond length is 2.59 Å. The Fe(1)-Si(1) bond length is 2.61 Å. The Fe(1)-C(1) bond length is 1.92 Å. In the second Fe site, Fe(2) is bonded in a single-bond geometry to one Fe(3), one Fe(4), one Fe(6), one Fe(9), one Si(1), and one N(1) atom. The Fe(2)-Fe(3) bond length is 2.52 Å. The Fe(2)-Fe(4) bond length is 2.44 Å. The Fe(2)-Fe(6) bond length is 2.47 Å. The Fe(2)-Fe(9) bond length is 2.58 Å. The Fe(2)-Si(1) bond length is 2.62 Å. The Fe(2)-N(1) bond length is 1.93 Å. In the third Fe site, Fe(3) is bonded to three equivalent Dy(1), one Fe(1), one Fe(2), one Fe(4), one Fe(5), one Fe(7), one Fe(8), two equivalent Fe(9), and one Si(1) atom to form FeDy3Fe8Si cuboctahedra that share  a cornercorner with one Fe(4)Dy2Fe8Si2 cuboctahedra,  a cornercorner with one Fe(5)Dy2Fe8Si2 cuboctahedra, corners with two equivalent Fe(9)Dy2Fe8Si2 cuboctahedra, corners with three equivalent Fe(6)Dy2Fe8Si2 cuboctahedra, corners with four equivalent Fe(3)Dy3Fe8Si cuboctahedra, corners with two equivalent C(1)Dy2Fe4 octahedra, corners with two equivalent N(1)Dy2Fe4 octahedra,  an edgeedge with one Fe(4)Dy2Fe8Si2 cuboctahedra,  an edgeedge with one Fe(5)Dy2Fe8Si2 cuboctahedra,  an edgeedge with one Fe(6)Dy2Fe8Si2 cuboctahedra,  an edgeedge with one Fe(3)Dy3Fe8Si cuboctahedra,  a faceface with one Fe(4)Dy2Fe8Si2 cuboctahedra,  a faceface with one Fe(5)Dy2Fe8Si2 cuboctahedra,  a faceface with one Fe(6)Dy2Fe8Si2 cuboctahedra,  a faceface with one Fe(3)Dy3Fe8Si cuboctahedra, faces with four equivalent Fe(9)Dy2Fe8Si2 cuboctahedra,  a faceface with one C(1)Dy2Fe4 octahedra, and  a faceface with one N(1)Dy2Fe4 octahedra. The corner-sharing octahedral tilt angles range from 63-71°. The Fe(3)-Fe(4) bond length is 2.44 Å. The Fe(3)-Fe(5) bond length is 2.44 Å. The Fe(3)-Fe(7) bond length is 2.59 Å. The Fe(3)-Fe(8) bond length is 2.58 Å. There is one shorter (2.60 Å) and one longer (2.62 Å) Fe(3)-Fe(9) bond length. The Fe(3)-Si(1) bond length is 2.62 Å. In the fourth Fe site, Fe(4) is bonded to two equivalent Dy(1), two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(8), two equivalent Fe(9), and two equivalent Si(1) atoms to form distorted FeDy2Fe8Si2 cuboctahedra that share corners with two equivalent Fe(5)Dy2Fe8Si2 cuboctahedra, corners with two equivalent Fe(6)Dy2Fe8Si2 cuboctahedra, corners with two equivalent Fe(9)Dy2Fe8Si2 cuboctahedra, corners with two equivalent Fe(3)Dy3Fe8Si cuboctahedra, corners with two equivalent C(1)Dy2Fe4 octahedra, edges with two equivalent Fe(9)Dy2Fe8Si2 cuboctahedra, edges with two equivalent Fe(3)Dy3Fe8Si cuboctahedra, faces with two equivalent Fe(5)Dy2Fe8Si2 cuboctahedra, faces with two equivalent Fe(6)Dy2Fe8Si2 cuboctahedra, faces with two equivalent Fe(9)Dy2Fe8Si2 cuboctahedra, faces with two equivalent Fe(3)Dy3Fe8Si cuboctahedra, and faces with two equivalent N(1)Dy2Fe4 octahedra. The corner-sharing octahedral tilt angles are 46°. Both Fe(4)-Fe(8) bond lengths are 2.44 Å. Both Fe(4)-Fe(9) bond lengths are 2.46 Å. Both Fe(4)-Si(1) bond lengths are 2.60 Å. In the fifth Fe site, Fe(5) is bonded to two equivalent Dy(1), two equivalent Fe(1), two equivalent Fe(3), two equivalent Fe(7), two equivalent Fe(9), and two equivalent Si(1) atoms to form distorted FeDy2Fe8Si2 cuboctahedra that share corners with two equivalent Fe(4)Dy2Fe8Si2 cuboctahedra, corners with two equivalent Fe(6)Dy2Fe8Si2 cuboctahedra, corners with two equivalent Fe(9)Dy2Fe8Si2 cuboctahedra, corners with two equivalent Fe(3)Dy3Fe8Si cuboctahedra, corners with two equivalent N(1)Dy2Fe4 octahedra, edges with two equivalent Fe(9)Dy2Fe8Si2 cuboctahedra, edges with two equivalent Fe(3)Dy3Fe8Si cuboctahedra, faces with two equivalent Fe(4)Dy2Fe8Si2 cuboctahedra, faces with two equivalent Fe(6)Dy2Fe8Si2 cuboctahedra, faces with two equivalent Fe(9)Dy2Fe8Si2 cuboctahedra, faces with two equivalent Fe(3)Dy3Fe8Si cuboctahedra, and faces with two equivalent C(1)Dy2Fe4 octahedra. The corner-sharing octahedral tilt angles are 45°. Both Fe(5)-Fe(7) bond lengths are 2.44 Å. Both Fe(5)-Fe(9) bond lengths are 2.46 Å. Both Fe(5)-Si(1) bond lengths are 2.59 Å. In the sixth Fe site, Fe(6) is bonded to two equivalent Dy(1), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(7), two equivalent Fe(8), and two equivalent Si(1) atoms to form distorted FeDy2Fe8Si2 cuboctahedra that share corners with two equivalent Fe(4)Dy2Fe8Si2 cuboctahedra, corners with two equivalent Fe(5)Dy2Fe8Si2 cuboctahedra, corners with four equivalent Fe(9)Dy2Fe8Si2 cuboctahedra, corners with six equivalent Fe(3)Dy3Fe8Si cuboctahedra, edges with two equivalent Fe(3)Dy3Fe8Si cuboctahedra, faces with two equivalent Fe(4)Dy2Fe8Si2 cuboctahedra, faces with two equivalent Fe(5)Dy2Fe8Si2 cuboctahedra, faces with two equivalent Fe(3)Dy3Fe8Si cuboctahedra, faces with four equivalent Fe(9)Dy2Fe8Si2 cuboctahedra, faces with two equivalent C(1)Dy2Fe4 octahedra, and faces with two equivalent N(1)Dy2Fe4 octahedra. Both Fe(6)-Fe(7) bond lengths are 2.44 Å. Both Fe(6)-Fe(8) bond lengths are 2.44 Å. Both Fe(6)-Si(1) bond lengths are 2.60 Å. In the seventh Fe site, Fe(7) is bonded in a single-bond geometry to one Fe(3), one Fe(5), one Fe(6), one Fe(9), two equivalent Si(1), and one C(1) atom. The Fe(7)-Fe(9) bond length is 2.45 Å. Both Fe(7)-Si(1) bond lengths are 2.73 Å. The Fe(7)-C(1) bond length is 1.85 Å. In the eighth Fe site, Fe(8) is bonded in a single-bond geometry to one Fe(3), one Fe(4), one Fe(6), one Fe(9), two equivalent Si(1), and one N(1) atom. The Fe(8)-Fe(9) bond length is 2.46 Å. There is one shorter (2.70 Å) and one longer (2.71 Å) Fe(8)-Si(1) bond length. The Fe(8)-N(1) bond length is 1.89 Å. In the ninth Fe site, Fe(9) is bonded to two equivalent Dy(1), one Fe(1), one Fe(2), one Fe(4), one Fe(5), one Fe(7), one Fe(8), two equivalent Fe(3), and two equivalent Si(1) atoms to form distorted FeDy2Fe8Si2 cuboctahedra that share  a cornercorner with one Fe(4)Dy2Fe8Si2 cuboctahedra,  a cornercorner with one Fe(5)Dy2Fe8Si2 cuboctahedra, corners with two equivalent Fe(6)Dy2Fe8Si2 cuboctahedra, corners with two equivalent Fe(9)Dy2Fe8Si2 cuboctahedra, corners with two equivalent Fe(3)Dy3Fe8Si cuboctahedra, corners with two equivalent C(1)Dy2Fe4 octahedra, corners with two equivalent N(1)Dy2Fe4 octahedra,  an edgeedge with one Fe(4)Dy2Fe8Si2 cuboctahedra,  an edgeedge with one Fe(5)Dy2Fe8Si2 cuboctahedra,  an edgeedge with one Fe(9)Dy2Fe8Si2 cuboctahedra,  an edgeedge with one C(1)Dy2Fe4 octahedra,  an edgeedge with one N(1)Dy2Fe4 octahedra,  a faceface with one Fe(4)Dy2Fe8Si2 cuboctahedra,  a faceface with one Fe(5)Dy2Fe8Si2 cuboctahedra,  a faceface with one Fe(9)Dy2Fe8Si2 cuboctahedra, faces with two equivalent Fe(6)Dy2Fe8Si2 cuboctahedra, and faces with four equivalent Fe(3)Dy3Fe8Si cuboctahedra. The corner-sharing octahedral tilt angles range from 24-29°. Both Fe(9)-Si(1) bond lengths are 2.79 Å. Si(1) is bonded in a 14-coordinate geometry to one Dy(1), one Fe(1), one Fe(2), one Fe(3), one Fe(4), one Fe(5), one Fe(6), two equivalent Fe(7), two equivalent Fe(8), two equivalent Fe(9), and one Si(1) atom. The Si(1)-Si(1) bond length is 2.54 Å. C(1) is bonded to two equivalent Dy(1), two equivalent Fe(1), and two equivalent Fe(7) atoms to form CDy2Fe4 octahedra that share corners with two equivalent Fe(4)Dy2Fe8Si2 cuboctahedra, corners with four equivalent Fe(9)Dy2Fe8Si2 cuboctahedra, corners with four equivalent Fe(3)Dy3Fe8Si cuboctahedra, corners with two equivalent N(1)Dy2Fe4 octahedra, edges with two equivalent Fe(9)Dy2Fe8Si2 cuboctahedra, faces with two equivalent Fe(5)Dy2Fe8Si2 cuboctahedra, faces with two equivalent Fe(6)Dy2Fe8Si2 cuboctahedra, and faces with two equivalent Fe(3)Dy3Fe8Si cuboctahedra. The corner-sharing octahedral tilt angles are 61°. N(1) is bonded to two equivalent Dy(1), two equivalent Fe(2), and two equivalent Fe(8) atoms to form NDy2Fe4 octahedra that share corners with two equivalent Fe(5)Dy2Fe8Si2 cuboctahedra, corners with four equivalent Fe(9)Dy2Fe8Si2 cuboctahedra, corners with four equivalent Fe(3)Dy3Fe8Si cuboctahedra, corners with two equivalent C(1)Dy2Fe4 octahedra, edges with two equivalent Fe(9)Dy2Fe8Si2 cuboctahedra, faces with two equivalent Fe(4)Dy2Fe8Si2 cuboctahedra, faces with two equivalent Fe(6)Dy2Fe8Si2 cuboctahedra, and faces with two equivalent Fe(3)Dy3Fe8Si cuboctahedra. The corner-sharing octahedral tilt angles are 61°.