The compound described by UIr2Si2 crystallizes in the orthorhombic Immm space group. U(1) is bonded in a 16-coordinate geometry to eight equivalent Ir(1) and eight equivalent Si(1) atoms. Ir(1) is bonded to four equivalent U(1) and four equivalent Si(1) atoms to form a mixture of distorted edge, face, and corner-sharing IrU4Si4 tetrahedra. Si(1) is bonded in a 9-coordinate geometry to four equivalent U(1), four equivalent Ir(1), and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_U(SiIr)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.034
_cell_length_b   4.048
_cell_length_c   5.707
_cell_angle_alpha   110.771
_cell_angle_beta   110.695
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   80.668
_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
  U  U0  1  0.000  0.000  0.000  1.0
  Si  Si1  1  0.619  0.619  0.237  1.0
  Si  Si2  1  0.381  0.381  0.763  1.0
  Ir  Ir3  1  0.749  0.249  0.499  1.0
  Ir  Ir4  1  0.251  0.751  0.501  1.0
[/CIF]
.
The compound described by UIr2Si2 crystallizes in the orthorhombic Immm space group. U(1) is bonded in a 16-coordinate geometry to eight equivalent Ir(1) and eight equivalent Si(1) atoms. Ir(1) is bonded to four equivalent U(1) and four equivalent Si(1) atoms to form a mixture of distorted edge, face, and corner-sharing IrU4Si4 tetrahedra. Si(1) is bonded in a 9-coordinate geometry to four equivalent U(1), four equivalent Ir(1), and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_U(SiIr)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.034
_cell_length_b   4.048
_cell_length_c   5.707
_cell_angle_alpha   110.771
_cell_angle_beta   110.695
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   80.668
_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
  U  U0  1  0.000  0.000  0.000  1.0
  Si  Si1  1  0.619  0.619  0.237  1.0
  Si  Si2  1  0.381  0.381  0.763  1.0
  Ir  Ir3  1  0.749  0.249  0.499  1.0
  Ir  Ir4  1  0.251  0.751  0.501  1.0
[/CIF]
.