The structure described by Np(IrSi)2 crystallizes in the tetragonal P4/nmm space group. Np(1) is bonded in a 16-coordinate geometry to four equivalent Ir(1), four equivalent Ir(2), four equivalent Si(1), and four equivalent Si(2) atoms. There are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded to four equivalent Np(1) and four equivalent Si(2) atoms to form distorted IrNp4Si4 tetrahedra that share corners with twelve equivalent Si(1)Np4Ir4 tetrahedra, edges with two equivalent Si(1)Np4Ir4 tetrahedra, edges with four equivalent Ir(1)Np4Si4 tetrahedra, and faces with four equivalent Ir(1)Np4Si4 tetrahedra. In the second Ir site, Ir(2) is bonded in a 9-coordinate geometry to four equivalent Np(1), one Si(2), and four equivalent Si(1) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to four equivalent Np(1) and four equivalent Ir(2) atoms to form distorted SiNp4Ir4 tetrahedra that share corners with twelve equivalent Ir(1)Np4Si4 tetrahedra, edges with two equivalent Ir(1)Np4Si4 tetrahedra, edges with four equivalent Si(1)Np4Ir4 tetrahedra, and faces with four equivalent Si(1)Np4Ir4 tetrahedra. In the second Si site, Si(2) is bonded in a 5-coordinate geometry to four equivalent Np(1), one Ir(2), and four equivalent Ir(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Np(SiIr)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.123
_cell_length_b   4.123
_cell_length_c   9.855
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   167.533
_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
  Np  Np0  1  0.750  0.750  0.257  1.0
  Np  Np1  1  0.250  0.250  0.743  1.0
  Si  Si2  1  0.750  0.250  0.500  1.0
  Si  Si3  1  0.250  0.750  0.500  1.0
  Si  Si4  1  0.750  0.750  0.870  1.0
  Si  Si5  1  0.250  0.250  0.130  1.0
  Ir  Ir6  1  0.250  0.750  0.000  1.0
  Ir  Ir7  1  0.750  0.250  0.000  1.0
  Ir  Ir8  1  0.750  0.750  0.629  1.0
  Ir  Ir9  1  0.250  0.250  0.371  1.0
[/CIF]
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The structure described by Np(IrSi)2 crystallizes in the tetragonal P4/nmm space group. Np(1) is bonded in a 16-coordinate geometry to four equivalent Ir(1), four equivalent Ir(2), four equivalent Si(1), and four equivalent Si(2) atoms. There are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded to four equivalent Np(1) and four equivalent Si(2) atoms to form distorted IrNp4Si4 tetrahedra that share corners with twelve equivalent Si(1)Np4Ir4 tetrahedra, edges with two equivalent Si(1)Np4Ir4 tetrahedra, edges with four equivalent Ir(1)Np4Si4 tetrahedra, and faces with four equivalent Ir(1)Np4Si4 tetrahedra. In the second Ir site, Ir(2) is bonded in a 9-coordinate geometry to four equivalent Np(1), one Si(2), and four equivalent Si(1) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to four equivalent Np(1) and four equivalent Ir(2) atoms to form distorted SiNp4Ir4 tetrahedra that share corners with twelve equivalent Ir(1)Np4Si4 tetrahedra, edges with two equivalent Ir(1)Np4Si4 tetrahedra, edges with four equivalent Si(1)Np4Ir4 tetrahedra, and faces with four equivalent Si(1)Np4Ir4 tetrahedra. In the second Si site, Si(2) is bonded in a 5-coordinate geometry to four equivalent Np(1), one Ir(2), and four equivalent Ir(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Np(SiIr)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.123
_cell_length_b   4.123
_cell_length_c   9.855
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   167.533
_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
  Np  Np0  1  0.750  0.750  0.257  1.0
  Np  Np1  1  0.250  0.250  0.743  1.0
  Si  Si2  1  0.750  0.250  0.500  1.0
  Si  Si3  1  0.250  0.750  0.500  1.0
  Si  Si4  1  0.750  0.750  0.870  1.0
  Si  Si5  1  0.250  0.250  0.130  1.0
  Ir  Ir6  1  0.250  0.750  0.000  1.0
  Ir  Ir7  1  0.750  0.250  0.000  1.0
  Ir  Ir8  1  0.750  0.750  0.629  1.0
  Ir  Ir9  1  0.250  0.250  0.371  1.0
[/CIF]
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