data_Eu(SiIr)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.89
_cell_length_b   5.89
_cell_length_c   5.89
_cell_angle_alpha   139.03
_cell_angle_beta   139.03
_cell_angle_gamma   59.32
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Eu(SiIr)2
_chemical_formula_sum   'Eu1 Si2 Ir2'
_cell_volume   86.86
_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
  Eu  Eu0  1  0.0  0.0  0.0  1.0
  Si  Si1  1  0.0  0.0  0.41  1.0
  Si  Si2  1  0.0  0.0  0.82  1.0
  Ir  Ir3  1  0.06  0.0  0.56  1.0
  Ir  Ir4  1  0.0  0.06  0.56  1.0

data_Eu(SiIr)2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.83
_cell_length_b   5.83
_cell_length_c   5.89
_cell_angle_alpha   90.0
_cell_angle_beta   119.66
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Eu(SiIr)2
_chemical_formula_sum   'Eu2 Si4 Ir4'
_cell_volume   173.72
_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
  Eu  Eu0  2  0.0  0.0  0.0  1.0
  Si  Si1  2  0.0  0.0  0.18  1.0
  Si  Si2  2  0.0  0.0  0.59  1.0
  Ir  Ir3  4  0.03  0.03  0.5  1.0

Eu Si Si Ir Ir
EuIr2Si2 crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two EuIr2Si2 clusters. Eu(1) is bonded in a distorted linear geometry to one Si(1) and one Si(2) atom. The Eu(1)-Si(1) bond length is 2.40 Å. The Eu(1)-Si(2) bond length is 1.03 Å. Ir(1) is bonded in a 2-coordinate geometry to one Ir(1) and one Si(1) atom. The Ir(1)-Ir(1) bond length is 0.35 Å. The Ir(1)-Si(1) bond length is 0.66 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 3-coordinate geometry to one Eu(1) and two equivalent Ir(1) atoms. In the second Si site, Si(2) is bonded in a single-bond geometry to one Eu(1) atom.