The structure described by Cs(NpSe3)2 crystallizes in the orthorhombic Immm space group. Cs(1) is bonded to eight equivalent Se(1) atoms to form face-sharing CsSe8 hexagonal bipyramids. Np(1) is bonded in a 8-coordinate geometry to four equivalent Se(1) and four equivalent Se(2) atoms. There are two inequivalent Se sites. In the first Se site, Se(2) is bonded to four equivalent Np(1) atoms to form a mixture of distorted corner and edge-sharing SeNp4 trigonal pyramids. In the second Se site, Se(1) is bonded in a 6-coordinate geometry to two equivalent Cs(1), two equivalent Np(1), and two equivalent Se(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Cs(NpSe3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.518
_cell_length_b   12.518
_cell_length_c   12.518
_cell_angle_alpha   160.920
_cell_angle_beta   154.832
_cell_angle_gamma   31.774
_symmetry_Int_Tables_number   1
_cell_volume   272.472
_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
  Cs  Cs0  1  0.000  1.000  1.000  1.0
  Np  Np1  1  0.814  0.814  1.000  1.0
  Np  Np2  1  0.186  0.186  0.000  1.0
  Se  Se3  1  0.875  0.618  0.257  1.0
  Se  Se4  1  0.125  0.382  0.743  1.0
  Se  Se5  1  0.639  0.382  0.257  1.0
  Se  Se6  1  0.361  0.618  0.743  1.0
  Se  Se7  1  0.730  0.230  0.500  1.0
  Se  Se8  1  0.270  0.770  0.500  1.0
[/CIF]
.
The structure described by Cs(NpSe3)2 crystallizes in the orthorhombic Immm space group. Cs(1) is bonded to eight equivalent Se(1) atoms to form face-sharing CsSe8 hexagonal bipyramids. Np(1) is bonded in a 8-coordinate geometry to four equivalent Se(1) and four equivalent Se(2) atoms. There are two inequivalent Se sites. In the first Se site, Se(2) is bonded to four equivalent Np(1) atoms to form a mixture of distorted corner and edge-sharing SeNp4 trigonal pyramids. In the second Se site, Se(1) is bonded in a 6-coordinate geometry to two equivalent Cs(1), two equivalent Np(1), and two equivalent Se(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Cs(NpSe3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.518
_cell_length_b   12.518
_cell_length_c   12.518
_cell_angle_alpha   160.920
_cell_angle_beta   154.832
_cell_angle_gamma   31.774
_symmetry_Int_Tables_number   1
_cell_volume   272.472
_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
  Cs  Cs0  1  0.000  1.000  1.000  1.0
  Np  Np1  1  0.814  0.814  1.000  1.0
  Np  Np2  1  0.186  0.186  0.000  1.0
  Se  Se3  1  0.875  0.618  0.257  1.0
  Se  Se4  1  0.125  0.382  0.743  1.0
  Se  Se5  1  0.639  0.382  0.257  1.0
  Se  Se6  1  0.361  0.618  0.743  1.0
  Se  Se7  1  0.730  0.230  0.500  1.0
  Se  Se8  1  0.270  0.770  0.500  1.0
[/CIF]
.