The structure described by Nd2Co17N2 crystallizes in the monoclinic C2/m space group. Nd(1) is bonded in a distorted bent 120 degrees geometry to one Co(1), one Co(6), two equivalent Co(4), two equivalent Co(7), three equivalent Co(2), and two equivalent N(1) atoms. There are seven inequivalent Co sites. In the first Co site, Co(1) is bonded in a 14-coordinate geometry to one Nd(1), one Co(1), one Co(2), one Co(6), two equivalent Co(3), two equivalent Co(4), two equivalent Co(7), and four equivalent Co(5) atoms. In the second Co site, Co(2) is bonded to three equivalent Nd(1), one Co(1), two equivalent Co(3), two equivalent Co(4), two equivalent Co(5), and two equivalent Co(7) atoms to form distorted CoNd3Co9 cuboctahedra that share corners with two equivalent Co(4)Nd2Co10 cuboctahedra, corners with two equivalent Co(7)Nd2Co10 cuboctahedra, corners with three equivalent Co(6)Nd2Co10 cuboctahedra, corners with four equivalent Co(2)Nd3Co9 cuboctahedra, corners with four equivalent N(1)Nd2Co4 octahedra,  an edgeedge with one Co(6)Nd2Co10 cuboctahedra,  an edgeedge with one Co(2)Nd3Co9 cuboctahedra, edges with two equivalent Co(7)Nd2Co10 cuboctahedra,  a faceface with one Co(6)Nd2Co10 cuboctahedra,  a faceface with one Co(2)Nd3Co9 cuboctahedra, faces with two equivalent Co(7)Nd2Co10 cuboctahedra, faces with four equivalent Co(4)Nd2Co10 cuboctahedra, and faces with two equivalent N(1)Nd2Co4 octahedra. The corner-sharing octahedral tilt angles range from 62-69°. In the third Co site, Co(3) is bonded in a single-bond geometry to one Co(1), one Co(2), one Co(4), one Co(6), one Co(7), and one N(1) atom. In the fourth Co site, Co(4) is bonded to two equivalent Nd(1), two equivalent Co(1), two equivalent Co(2), two equivalent Co(3), two equivalent Co(5), and two equivalent Co(7) atoms to form distorted CoNd2Co10 cuboctahedra that share corners with two equivalent Co(4)Nd2Co10 cuboctahedra, corners with two equivalent Co(6)Nd2Co10 cuboctahedra, corners with two equivalent Co(7)Nd2Co10 cuboctahedra, corners with two equivalent Co(2)Nd3Co9 cuboctahedra, corners with four equivalent N(1)Nd2Co4 octahedra,  an edgeedge with one Co(4)Nd2Co10 cuboctahedra, edges with two equivalent Co(7)Nd2Co10 cuboctahedra, edges with two equivalent N(1)Nd2Co4 octahedra,  a faceface with one Co(4)Nd2Co10 cuboctahedra, faces with two equivalent Co(6)Nd2Co10 cuboctahedra, faces with two equivalent Co(7)Nd2Co10 cuboctahedra, and faces with four equivalent Co(2)Nd3Co9 cuboctahedra. The corner-sharing octahedral tilt angles range from 21-29°. In the fifth Co site, Co(5) is bonded in a single-bond geometry to one Co(2), one Co(4), one Co(6), one Co(7), two equivalent Co(1), and one N(1) atom. In the sixth Co site, Co(6) is bonded to two equivalent Nd(1), two equivalent Co(1), four equivalent Co(3), and four equivalent Co(5) atoms to form distorted CoNd2Co10 cuboctahedra that share corners with four equivalent Co(4)Nd2Co10 cuboctahedra, corners with four equivalent Co(7)Nd2Co10 cuboctahedra, corners with six equivalent Co(2)Nd3Co9 cuboctahedra, edges with two equivalent Co(2)Nd3Co9 cuboctahedra, faces with two equivalent Co(2)Nd3Co9 cuboctahedra, faces with four equivalent Co(4)Nd2Co10 cuboctahedra, faces with four equivalent Co(7)Nd2Co10 cuboctahedra, and faces with four equivalent N(1)Nd2Co4 octahedra. In the seventh Co site, Co(7) is bonded to two equivalent Nd(1), two equivalent Co(1), two equivalent Co(2), two equivalent Co(3), two equivalent Co(4), and two equivalent Co(5) atoms to form distorted CoNd2Co10 cuboctahedra that share corners with two equivalent Co(4)Nd2Co10 cuboctahedra, corners with two equivalent Co(6)Nd2Co10 cuboctahedra, corners with two equivalent Co(7)Nd2Co10 cuboctahedra, corners with two equivalent Co(2)Nd3Co9 cuboctahedra, corners with two equivalent N(1)Nd2Co4 octahedra, edges with two equivalent Co(4)Nd2Co10 cuboctahedra, edges with two equivalent Co(2)Nd3Co9 cuboctahedra, faces with two equivalent Co(4)Nd2Co10 cuboctahedra, faces with two equivalent Co(6)Nd2Co10 cuboctahedra, faces with two equivalent Co(7)Nd2Co10 cuboctahedra, faces with two equivalent Co(2)Nd3Co9 cuboctahedra, and faces with two equivalent N(1)Nd2Co4 octahedra. The corner-sharing octahedral tilt angles are 45°. N(1) is bonded to two equivalent Nd(1), two equivalent Co(3), and two equivalent Co(5) atoms to form NNd2Co4 octahedra that share corners with two equivalent Co(7)Nd2Co10 cuboctahedra, corners with four equivalent Co(4)Nd2Co10 cuboctahedra, corners with four equivalent Co(2)Nd3Co9 cuboctahedra, corners with two equivalent N(1)Nd2Co4 octahedra, edges with two equivalent Co(4)Nd2Co10 cuboctahedra, faces with two equivalent Co(6)Nd2Co10 cuboctahedra, faces with two equivalent Co(7)Nd2Co10 cuboctahedra, and faces with two equivalent Co(2)Nd3Co9 cuboctahedra. The corner-sharing octahedral tilt angles are 63°. is represented by the CIF file [CIF]
data_Nd2Co17N2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.372
_cell_length_b   6.372
_cell_length_c   6.427
_cell_angle_alpha   84.007
_cell_angle_beta   84.007
_cell_angle_gamma   84.206
_symmetry_Int_Tables_number   1
_cell_volume   257.005
_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
  Nd  Nd0  1  0.650  0.650  0.665  1.0
  Nd  Nd1  1  0.350  0.350  0.335  1.0
  Co  Co2  1  0.911  0.911  0.893  1.0
  Co  Co3  1  0.089  0.089  0.107  1.0
  Co  Co4  1  0.345  0.345  0.867  1.0
  Co  Co5  1  0.864  0.342  0.343  1.0
  Co  Co6  1  0.342  0.864  0.343  1.0
  Co  Co7  1  0.655  0.655  0.133  1.0
  Co  Co8  1  0.136  0.658  0.657  1.0
  Co  Co9  1  0.658  0.136  0.657  1.0
  Co  Co10  1  0.719  0.281  0.000  1.0
  Co  Co11  1  0.997  0.717  0.279  1.0
  Co  Co12  1  0.283  0.003  0.721  1.0
  Co  Co13  1  0.003  0.283  0.721  1.0
  Co  Co14  1  0.717  0.997  0.279  1.0
  Co  Co15  1  0.281  0.719  0.000  1.0
  Co  Co16  1  0.000  0.000  0.500  1.0
  Co  Co17  1  0.500  0.000  0.000  1.0
  Co  Co18  1  0.000  0.500  0.000  1.0
  N  N19  1  0.000  0.500  0.500  1.0
  N  N20  1  0.500  0.000  0.500  1.0
[/CIF]
.
The structure described by Nd2Co17N2 crystallizes in the monoclinic C2/m space group. Nd(1) is bonded in a distorted bent 120 degrees geometry to one Co(1), one Co(6), two equivalent Co(4), two equivalent Co(7), three equivalent Co(2), and two equivalent N(1) atoms. There are seven inequivalent Co sites. In the first Co site, Co(1) is bonded in a 14-coordinate geometry to one Nd(1), one Co(1), one Co(2), one Co(6), two equivalent Co(3), two equivalent Co(4), two equivalent Co(7), and four equivalent Co(5) atoms. In the second Co site, Co(2) is bonded to three equivalent Nd(1), one Co(1), two equivalent Co(3), two equivalent Co(4), two equivalent Co(5), and two equivalent Co(7) atoms to form distorted CoNd3Co9 cuboctahedra that share corners with two equivalent Co(4)Nd2Co10 cuboctahedra, corners with two equivalent Co(7)Nd2Co10 cuboctahedra, corners with three equivalent Co(6)Nd2Co10 cuboctahedra, corners with four equivalent Co(2)Nd3Co9 cuboctahedra, corners with four equivalent N(1)Nd2Co4 octahedra,  an edgeedge with one Co(6)Nd2Co10 cuboctahedra,  an edgeedge with one Co(2)Nd3Co9 cuboctahedra, edges with two equivalent Co(7)Nd2Co10 cuboctahedra,  a faceface with one Co(6)Nd2Co10 cuboctahedra,  a faceface with one Co(2)Nd3Co9 cuboctahedra, faces with two equivalent Co(7)Nd2Co10 cuboctahedra, faces with four equivalent Co(4)Nd2Co10 cuboctahedra, and faces with two equivalent N(1)Nd2Co4 octahedra. The corner-sharing octahedral tilt angles range from 62-69°. In the third Co site, Co(3) is bonded in a single-bond geometry to one Co(1), one Co(2), one Co(4), one Co(6), one Co(7), and one N(1) atom. In the fourth Co site, Co(4) is bonded to two equivalent Nd(1), two equivalent Co(1), two equivalent Co(2), two equivalent Co(3), two equivalent Co(5), and two equivalent Co(7) atoms to form distorted CoNd2Co10 cuboctahedra that share corners with two equivalent Co(4)Nd2Co10 cuboctahedra, corners with two equivalent Co(6)Nd2Co10 cuboctahedra, corners with two equivalent Co(7)Nd2Co10 cuboctahedra, corners with two equivalent Co(2)Nd3Co9 cuboctahedra, corners with four equivalent N(1)Nd2Co4 octahedra,  an edgeedge with one Co(4)Nd2Co10 cuboctahedra, edges with two equivalent Co(7)Nd2Co10 cuboctahedra, edges with two equivalent N(1)Nd2Co4 octahedra,  a faceface with one Co(4)Nd2Co10 cuboctahedra, faces with two equivalent Co(6)Nd2Co10 cuboctahedra, faces with two equivalent Co(7)Nd2Co10 cuboctahedra, and faces with four equivalent Co(2)Nd3Co9 cuboctahedra. The corner-sharing octahedral tilt angles range from 21-29°. In the fifth Co site, Co(5) is bonded in a single-bond geometry to one Co(2), one Co(4), one Co(6), one Co(7), two equivalent Co(1), and one N(1) atom. In the sixth Co site, Co(6) is bonded to two equivalent Nd(1), two equivalent Co(1), four equivalent Co(3), and four equivalent Co(5) atoms to form distorted CoNd2Co10 cuboctahedra that share corners with four equivalent Co(4)Nd2Co10 cuboctahedra, corners with four equivalent Co(7)Nd2Co10 cuboctahedra, corners with six equivalent Co(2)Nd3Co9 cuboctahedra, edges with two equivalent Co(2)Nd3Co9 cuboctahedra, faces with two equivalent Co(2)Nd3Co9 cuboctahedra, faces with four equivalent Co(4)Nd2Co10 cuboctahedra, faces with four equivalent Co(7)Nd2Co10 cuboctahedra, and faces with four equivalent N(1)Nd2Co4 octahedra. In the seventh Co site, Co(7) is bonded to two equivalent Nd(1), two equivalent Co(1), two equivalent Co(2), two equivalent Co(3), two equivalent Co(4), and two equivalent Co(5) atoms to form distorted CoNd2Co10 cuboctahedra that share corners with two equivalent Co(4)Nd2Co10 cuboctahedra, corners with two equivalent Co(6)Nd2Co10 cuboctahedra, corners with two equivalent Co(7)Nd2Co10 cuboctahedra, corners with two equivalent Co(2)Nd3Co9 cuboctahedra, corners with two equivalent N(1)Nd2Co4 octahedra, edges with two equivalent Co(4)Nd2Co10 cuboctahedra, edges with two equivalent Co(2)Nd3Co9 cuboctahedra, faces with two equivalent Co(4)Nd2Co10 cuboctahedra, faces with two equivalent Co(6)Nd2Co10 cuboctahedra, faces with two equivalent Co(7)Nd2Co10 cuboctahedra, faces with two equivalent Co(2)Nd3Co9 cuboctahedra, and faces with two equivalent N(1)Nd2Co4 octahedra. The corner-sharing octahedral tilt angles are 45°. N(1) is bonded to two equivalent Nd(1), two equivalent Co(3), and two equivalent Co(5) atoms to form NNd2Co4 octahedra that share corners with two equivalent Co(7)Nd2Co10 cuboctahedra, corners with four equivalent Co(4)Nd2Co10 cuboctahedra, corners with four equivalent Co(2)Nd3Co9 cuboctahedra, corners with two equivalent N(1)Nd2Co4 octahedra, edges with two equivalent Co(4)Nd2Co10 cuboctahedra, faces with two equivalent Co(6)Nd2Co10 cuboctahedra, faces with two equivalent Co(7)Nd2Co10 cuboctahedra, and faces with two equivalent Co(2)Nd3Co9 cuboctahedra. The corner-sharing octahedral tilt angles are 63°. is represented by the CIF file [CIF]
data_Nd2Co17N2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.372
_cell_length_b   6.372
_cell_length_c   6.427
_cell_angle_alpha   84.007
_cell_angle_beta   84.007
_cell_angle_gamma   84.206
_symmetry_Int_Tables_number   1
_cell_volume   257.005
_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
  Nd  Nd0  1  0.650  0.650  0.665  1.0
  Nd  Nd1  1  0.350  0.350  0.335  1.0
  Co  Co2  1  0.911  0.911  0.893  1.0
  Co  Co3  1  0.089  0.089  0.107  1.0
  Co  Co4  1  0.345  0.345  0.867  1.0
  Co  Co5  1  0.864  0.342  0.343  1.0
  Co  Co6  1  0.342  0.864  0.343  1.0
  Co  Co7  1  0.655  0.655  0.133  1.0
  Co  Co8  1  0.136  0.658  0.657  1.0
  Co  Co9  1  0.658  0.136  0.657  1.0
  Co  Co10  1  0.719  0.281  0.000  1.0
  Co  Co11  1  0.997  0.717  0.279  1.0
  Co  Co12  1  0.283  0.003  0.721  1.0
  Co  Co13  1  0.003  0.283  0.721  1.0
  Co  Co14  1  0.717  0.997  0.279  1.0
  Co  Co15  1  0.281  0.719  0.000  1.0
  Co  Co16  1  0.000  0.000  0.500  1.0
  Co  Co17  1  0.500  0.000  0.000  1.0
  Co  Co18  1  0.000  0.500  0.000  1.0
  N  N19  1  0.000  0.500  0.500  1.0
  N  N20  1  0.500  0.000  0.500  1.0
[/CIF]
.