The structure described by Gd3NSe2O crystallizes in the monoclinic C2/m space group. There are three inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a 7-coordinate geometry to two equivalent N(1), three equivalent Se(1), and two equivalent O(1) atoms. In the second Gd site, Gd(2) is bonded in a 6-coordinate geometry to one N(1), one Se(1), two equivalent Se(2), and two equivalent O(1) atoms. In the third Gd site, Gd(3) is bonded to one N(1), two equivalent Se(1), and three equivalent Se(2) atoms to form distorted edge-sharing GdSe5N octahedra. N(1) is bonded to one Gd(2), one Gd(3), and two equivalent Gd(1) atoms to form NGd4 tetrahedra that share corners with three equivalent Se(1)Gd6 octahedra, corners with five equivalent Se(2)Gd5 square pyramids, corners with two equivalent N(1)Gd4 tetrahedra, corners with two equivalent O(1)Gd4 tetrahedra, edges with three equivalent Se(1)Gd6 octahedra, and edges with two equivalent O(1)Gd4 tetrahedra. The corner-sharing octahedral tilt angles range from 28-40°. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded to one Gd(2), two equivalent Gd(3), and three equivalent Gd(1) atoms to form distorted SeGd6 octahedra that share corners with two equivalent Se(2)Gd5 square pyramids, corners with three equivalent N(1)Gd4 tetrahedra, corners with four equivalent O(1)Gd4 tetrahedra, edges with four equivalent Se(1)Gd6 octahedra, edges with three equivalent Se(2)Gd5 square pyramids, edges with two equivalent O(1)Gd4 tetrahedra, and edges with three equivalent N(1)Gd4 tetrahedra. In the second Se site, Se(2) is bonded to two equivalent Gd(2) and three equivalent Gd(3) atoms to form SeGd5 square pyramids that share corners with two equivalent Se(1)Gd6 octahedra, corners with two equivalent O(1)Gd4 tetrahedra, corners with five equivalent N(1)Gd4 tetrahedra, edges with three equivalent Se(1)Gd6 octahedra, edges with four equivalent Se(2)Gd5 square pyramids, and  an edgeedge with one O(1)Gd4 tetrahedra. The corner-sharing octahedral tilt angles are 9°. O(1) is bonded to two equivalent Gd(1) and two equivalent Gd(2) atoms to form OGd4 tetrahedra that share corners with four equivalent Se(1)Gd6 octahedra, corners with two equivalent Se(2)Gd5 square pyramids, corners with two equivalent N(1)Gd4 tetrahedra, corners with two equivalent O(1)Gd4 tetrahedra, edges with two equivalent Se(1)Gd6 octahedra,  an edgeedge with one Se(2)Gd5 square pyramid,  an edgeedge with one O(1)Gd4 tetrahedra, and edges with two equivalent N(1)Gd4 tetrahedra. The corner-sharing octahedral tilt angles range from 36-50°. is represented by the CIF file [CIF]
data_Gd3Se2NO
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.088
_cell_length_b   8.088
_cell_length_c   9.833
_cell_angle_alpha   82.908
_cell_angle_beta   82.908
_cell_angle_gamma   28.398
_symmetry_Int_Tables_number   1
_cell_volume   303.419
_cell_formula_units_Z   2
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
  Gd  Gd0  1  0.391  0.391  0.946  1.0
  Gd  Gd1  1  0.609  0.609  0.054  1.0
  Gd  Gd2  1  0.044  0.044  0.738  1.0
  Gd  Gd3  1  0.956  0.956  0.262  1.0
  Gd  Gd4  1  0.197  0.197  0.325  1.0
  Gd  Gd5  1  0.803  0.803  0.675  1.0
  Se  Se6  1  0.212  0.212  0.849  1.0
  Se  Se7  1  0.788  0.788  0.151  1.0
  Se  Se8  1  0.371  0.371  0.474  1.0
  Se  Se9  1  0.629  0.629  0.526  1.0
  N  N10  1  0.098  0.098  0.188  1.0
  N  N11  1  0.902  0.902  0.812  1.0
  O  O12  1  0.535  0.535  0.860  1.0
  O  O13  1  0.465  0.465  0.140  1.0
[/CIF]
.
The structure described by Gd3NSe2O crystallizes in the monoclinic C2/m space group. There are three inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a 7-coordinate geometry to two equivalent N(1), three equivalent Se(1), and two equivalent O(1) atoms. In the second Gd site, Gd(2) is bonded in a 6-coordinate geometry to one N(1), one Se(1), two equivalent Se(2), and two equivalent O(1) atoms. In the third Gd site, Gd(3) is bonded to one N(1), two equivalent Se(1), and three equivalent Se(2) atoms to form distorted edge-sharing GdSe5N octahedra. N(1) is bonded to one Gd(2), one Gd(3), and two equivalent Gd(1) atoms to form NGd4 tetrahedra that share corners with three equivalent Se(1)Gd6 octahedra, corners with five equivalent Se(2)Gd5 square pyramids, corners with two equivalent N(1)Gd4 tetrahedra, corners with two equivalent O(1)Gd4 tetrahedra, edges with three equivalent Se(1)Gd6 octahedra, and edges with two equivalent O(1)Gd4 tetrahedra. The corner-sharing octahedral tilt angles range from 28-40°. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded to one Gd(2), two equivalent Gd(3), and three equivalent Gd(1) atoms to form distorted SeGd6 octahedra that share corners with two equivalent Se(2)Gd5 square pyramids, corners with three equivalent N(1)Gd4 tetrahedra, corners with four equivalent O(1)Gd4 tetrahedra, edges with four equivalent Se(1)Gd6 octahedra, edges with three equivalent Se(2)Gd5 square pyramids, edges with two equivalent O(1)Gd4 tetrahedra, and edges with three equivalent N(1)Gd4 tetrahedra. In the second Se site, Se(2) is bonded to two equivalent Gd(2) and three equivalent Gd(3) atoms to form SeGd5 square pyramids that share corners with two equivalent Se(1)Gd6 octahedra, corners with two equivalent O(1)Gd4 tetrahedra, corners with five equivalent N(1)Gd4 tetrahedra, edges with three equivalent Se(1)Gd6 octahedra, edges with four equivalent Se(2)Gd5 square pyramids, and  an edgeedge with one O(1)Gd4 tetrahedra. The corner-sharing octahedral tilt angles are 9°. O(1) is bonded to two equivalent Gd(1) and two equivalent Gd(2) atoms to form OGd4 tetrahedra that share corners with four equivalent Se(1)Gd6 octahedra, corners with two equivalent Se(2)Gd5 square pyramids, corners with two equivalent N(1)Gd4 tetrahedra, corners with two equivalent O(1)Gd4 tetrahedra, edges with two equivalent Se(1)Gd6 octahedra,  an edgeedge with one Se(2)Gd5 square pyramid,  an edgeedge with one O(1)Gd4 tetrahedra, and edges with two equivalent N(1)Gd4 tetrahedra. The corner-sharing octahedral tilt angles range from 36-50°. is represented by the CIF file [CIF]
data_Gd3Se2NO
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.088
_cell_length_b   8.088
_cell_length_c   9.833
_cell_angle_alpha   82.908
_cell_angle_beta   82.908
_cell_angle_gamma   28.398
_symmetry_Int_Tables_number   1
_cell_volume   303.419
_cell_formula_units_Z   2
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
  Gd  Gd0  1  0.391  0.391  0.946  1.0
  Gd  Gd1  1  0.609  0.609  0.054  1.0
  Gd  Gd2  1  0.044  0.044  0.738  1.0
  Gd  Gd3  1  0.956  0.956  0.262  1.0
  Gd  Gd4  1  0.197  0.197  0.325  1.0
  Gd  Gd5  1  0.803  0.803  0.675  1.0
  Se  Se6  1  0.212  0.212  0.849  1.0
  Se  Se7  1  0.788  0.788  0.151  1.0
  Se  Se8  1  0.371  0.371  0.474  1.0
  Se  Se9  1  0.629  0.629  0.526  1.0
  N  N10  1  0.098  0.098  0.188  1.0
  N  N11  1  0.902  0.902  0.812  1.0
  O  O12  1  0.535  0.535  0.860  1.0
  O  O13  1  0.465  0.465  0.140  1.0
[/CIF]
.