The compound described by 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°. is represented by the CIF file [CIF]
data_Dy2Fe15Si2CN
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.451
_cell_length_b   6.468
_cell_length_c   6.475
_cell_angle_alpha   82.842
_cell_angle_beta   82.313
_cell_angle_gamma   82.688
_symmetry_Int_Tables_number   1
_cell_volume   263.924
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Dy  Dy0  1  0.340  0.343  0.350  1.0
  Dy  Dy1  1  0.660  0.657  0.650  1.0
  Fe  Fe2  1  0.654  0.658  0.147  1.0
  Fe  Fe3  1  0.149  0.658  0.654  1.0
  Fe  Fe4  1  0.656  0.146  0.657  1.0
  Fe  Fe5  1  0.346  0.342  0.853  1.0
  Fe  Fe6  1  0.851  0.342  0.346  1.0
  Fe  Fe7  1  0.344  0.854  0.343  1.0
  Fe  Fe8  1  0.000  0.000  0.500  1.0
  Fe  Fe9  1  0.500  0.000  0.000  1.0
  Fe  Fe10  1  0.000  0.500  0.000  1.0
  Fe  Fe11  1  0.284  0.717  0.998  1.0
  Fe  Fe12  1  0.998  0.280  0.721  1.0
  Fe  Fe13  1  0.707  0.001  0.292  1.0
  Fe  Fe14  1  0.002  0.720  0.279  1.0
  Fe  Fe15  1  0.293  0.999  0.708  1.0
  Fe  Fe16  1  0.716  0.283  0.002  1.0
  Si  Si17  1  0.101  0.101  0.101  1.0
  Si  Si18  1  0.899  0.899  0.899  1.0
  C  C19  1  0.500  0.500  0.000  1.0
  N  N20  1  0.000  0.500  0.500  1.0
[/CIF]
.
The compound described by 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°. is represented by the CIF file [CIF]
data_Dy2Fe15Si2CN
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.451
_cell_length_b   6.468
_cell_length_c   6.475
_cell_angle_alpha   82.842
_cell_angle_beta   82.313
_cell_angle_gamma   82.688
_symmetry_Int_Tables_number   1
_cell_volume   263.924
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Dy  Dy0  1  0.340  0.343  0.350  1.0
  Dy  Dy1  1  0.660  0.657  0.650  1.0
  Fe  Fe2  1  0.654  0.658  0.147  1.0
  Fe  Fe3  1  0.149  0.658  0.654  1.0
  Fe  Fe4  1  0.656  0.146  0.657  1.0
  Fe  Fe5  1  0.346  0.342  0.853  1.0
  Fe  Fe6  1  0.851  0.342  0.346  1.0
  Fe  Fe7  1  0.344  0.854  0.343  1.0
  Fe  Fe8  1  0.000  0.000  0.500  1.0
  Fe  Fe9  1  0.500  0.000  0.000  1.0
  Fe  Fe10  1  0.000  0.500  0.000  1.0
  Fe  Fe11  1  0.284  0.717  0.998  1.0
  Fe  Fe12  1  0.998  0.280  0.721  1.0
  Fe  Fe13  1  0.707  0.001  0.292  1.0
  Fe  Fe14  1  0.002  0.720  0.279  1.0
  Fe  Fe15  1  0.293  0.999  0.708  1.0
  Fe  Fe16  1  0.716  0.283  0.002  1.0
  Si  Si17  1  0.101  0.101  0.101  1.0
  Si  Si18  1  0.899  0.899  0.899  1.0
  C  C19  1  0.500  0.500  0.000  1.0
  N  N20  1  0.000  0.500  0.500  1.0
[/CIF]
.