data_HgIr2Rh
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.94
_cell_length_b   3.94
_cell_length_c   4.12
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   HgIr2Rh
_chemical_formula_sum   'Hg1 Ir2 Rh1'
_cell_volume   63.77
_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
  Hg  Hg0  1  0.97  0.97  0.0  1.0
  Ir  Ir1  1  0.97  0.0  0.06  1.0
  Ir  Ir2  1  0.0  0.97  0.06  1.0
  Rh  Rh3  1  0.0  0.0  0.0  1.0

data_HgIr2Rh
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.57
_cell_length_b   5.57
_cell_length_c   4.12
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   HgIr2Rh
_chemical_formula_sum   'Hg2 Ir4 Rh2'
_cell_volume   127.53
_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
  Hg  Hg0  2  0.47  0.5  0.0  1.0
  Ir  Ir1  4  0.48  0.48  0.06  1.0
  Rh  Rh2  2  0.0  0.0  0.0  1.0

Hg Ir Ir Rh
Hg Ir Ir Rh 0 3 + + o 1 2 + - o 
Ir2RhHg is alpha Po structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two Ir2RhHg clusters. Ir(1) is bonded in a 3-coordinate geometry to one Ir(1), one Rh(1), and one Hg(1) atom. The Ir(1)-Ir(1) bond length is 0.18 Å. The Ir(1)-Rh(1) bond length is 0.27 Å. The Ir(1)-Hg(1) bond length is 0.27 Å. Rh(1) is bonded in a distorted single-bond geometry to two equivalent Ir(1) and one Hg(1) atom. The Rh(1)-Hg(1) bond length is 0.18 Å. Hg(1) is bonded in a 3-coordinate geometry to two equivalent Ir(1) and one Rh(1) atom.