data_SrSiIr2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.0
_cell_length_b   3.0
_cell_length_c   7.69
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SrSiIr2
_chemical_formula_sum   'Sr1 Si1 Ir2'
_cell_volume   69.35
_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
  Sr  Sr3  1  0.0  0.0  0.84  1.0
  Si  Si2  1  0.0  0.0  0.0  1.0
  Ir  Ir0  1  0.5  0.5  0.27  1.0
  Ir  Ir1  1  0.5  0.5  0.41  1.0

data_SrSiIr2
_symmetry_space_group_name_H-M   P4mm
_cell_length_a   3.0
_cell_length_b   3.0
_cell_length_c   7.69
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   99
_chemical_formula_structural   SrSiIr2
_chemical_formula_sum   'Sr1 Si1 Ir2'
_cell_volume   69.35
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-y, x, z'
  3  '-x, -y, z'
  4  'y, -x, z'
  5  '-x, y, z'
  6  'y, x, z'
  7  'x, -y, z'
  8  '-y, -x, 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
  Sr  Sr0  1  0.0  0.0  0.84  1.0
  Si  Si1  1  0.0  0.0  0.0  1.0
  Ir  Ir2  1  0.5  0.5  0.27  1.0
  Ir  Ir3  1  0.5  0.5  0.41  1.0

Sr Si Ir Ir
SrSi(Ir)2 is alpha Niobium phosphide-like structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two Ir clusters and two SrSi clusters. In each Ir cluster, there are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded in a single-bond geometry to one Ir(2) atom. The Ir(1)-Ir(2) bond length is 1.07 Å. In the second Ir site, Ir(2) is bonded in a single-bond geometry to one Ir(1) atom. In each SrSi cluster, Sr(1) is bonded in a single-bond geometry to one Si(1) atom. The Sr(1)-Si(1) bond length is 1.21 Å. Si(1) is bonded in a single-bond geometry to one Sr(1) atom.