data_MgRhAu2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.04
_cell_length_b   4.04
_cell_length_c   4.08
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   MgRhAu2
_chemical_formula_sum   'Mg1 Rh1 Au2'
_cell_volume   66.65
_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
  Mg  Mg2  1  0.0  0.0  0.0  1.0
  Rh  Rh3  1  0.02  0.02  0.0  1.0
  Au  Au0  1  0.02  0.0  0.04  1.0
  Au  Au1  1  0.0  0.02  0.04  1.0

data_MgRhAu2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.71
_cell_length_b   5.71
_cell_length_c   4.08
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   MgRhAu2
_chemical_formula_sum   'Mg2 Rh2 Au4'
_cell_volume   133.31
_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
  Mg  Mg0  2  0.0  0.0  0.0  1.0
  Rh  Rh1  2  0.02  0.0  0.0  1.0
  Au  Au2  4  0.01  0.01  0.04  1.0

Mg Rh Au Au
MgRhAu2 is alpha Po structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two MgRhAu2 clusters. Mg(1) is bonded in a 3-coordinate geometry to one Rh(1) and two equivalent Au(1) atoms. The Mg(1)-Rh(1) bond length is 0.11 Å. Both Mg(1)-Au(1) bond lengths are 0.19 Å. Rh(1) is bonded in a distorted single-bond geometry to one Mg(1) and two equivalent Au(1) atoms. Both Rh(1)-Au(1) bond lengths are 0.19 Å. Au(1) is bonded in a 3-coordinate geometry to one Mg(1), one Rh(1), and one Au(1) atom. The Au(1)-Au(1) bond length is 0.11 Å.