data_Y(SiIr)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.77
_cell_length_b   5.77
_cell_length_c   5.77
_cell_angle_alpha   138.58
_cell_angle_beta   138.58
_cell_angle_gamma   60.02
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Y(SiIr)2
_chemical_formula_sum   'Y1 Si2 Ir2'
_cell_volume   83.34
_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
  Y  Y4  1  0.0  0.0  0.0  1.0
  Si  Si2  1  0.0  0.0  0.21  1.0
  Si  Si3  1  0.0  0.0  0.79  1.0
  Ir  Ir0  1  0.04  0.0  0.5  1.0
  Ir  Ir1  1  0.0  0.04  0.5  1.0

data_Y(SiIr)2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.77
_cell_length_b   5.77
_cell_length_c   5.77
_cell_angle_alpha   90.0
_cell_angle_beta   120.01
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Y(SiIr)2
_chemical_formula_sum   'Y2 Si4 Ir4'
_cell_volume   166.69
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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
  Y  Y0  2  0.0  0.0  0.0  1.0
  Si  Si1  2  0.0  0.0  0.21  1.0
  Si  Si2  2  0.0  0.0  0.79  1.0
  Ir  Ir3  4  0.48  0.48  0.46  1.0

Y Si Si Ir Ir
YIr2Si2 crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two iridium molecules and two YSi2 clusters. In each YSi2 cluster, Y(1) is bonded in a linear geometry to one Si(1) and one Si(2) atom. The Y(1)-Si(1) bond length is 1.21 Å. The Y(1)-Si(2) bond length is 1.23 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a distorted single-bond geometry to one Y(1) atom. In the second Si site, Si(2) is bonded in a single-bond geometry to one Y(1) atom.