data_SiRh2Pb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.0
_cell_length_b   3.0
_cell_length_c   7.42
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   91.37
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SiRh2Pb
_chemical_formula_sum   'Si1 Rh2 Pb1'
_cell_volume   66.61
_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
  Si  Si3  1  0.0  0.0  0.0  1.0
  Rh  Rh1  1  0.09  0.0  0.04  1.0
  Rh  Rh2  1  0.09  0.0  0.37  1.0
  Pb  Pb0  1  0.0  0.0  0.71  1.0

data_SiRh2Pb
_symmetry_space_group_name_H-M   Pm
_cell_length_a   3.0
_cell_length_b   3.0
_cell_length_c   7.42
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   6
_chemical_formula_structural   SiRh2Pb
_chemical_formula_sum   'Si1 Rh2 Pb1'
_cell_volume   66.63
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '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
  Si  Si0  1  0.0  0.0  0.0  1.0
  Rh  Rh1  1  0.09  0.0  0.04  1.0
  Rh  Rh2  1  0.09  0.0  0.37  1.0
  Pb  Pb3  1  0.0  0.0  0.71  1.0

Si Rh Rh Pb
Rh2PbSi crystallizes in the monoclinic Pm space group. There are two inequivalent Rh sites. In the first Rh site, Rh(1) is bonded in a single-bond geometry to one Rh(2) and one Si(1) atom. The Rh(1)-Rh(2) bond length is 2.41 Å. The Rh(1)-Si(1) bond length is 0.44 Å. In the second Rh site, Rh(2) is bonded to one Rh(1), four equivalent Rh(2), and one Pb(1) atom to form a mixture of distorted edge and corner-sharing RhRh5Pb octahedra. The corner-sharing octahedra are not tilted. All Rh(2)-Rh(2) bond lengths are 3.00 Å. The Rh(2)-Pb(1) bond length is 2.52 Å. Pb(1) is bonded in a 1-coordinate geometry to one Rh(2) and one Si(1) atom. The Pb(1)-Si(1) bond length is 2.17 Å. Si(1) is bonded in a distorted single-bond geometry to one Rh(1) and one Pb(1) atom.