data_MgCrRh2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.81
_cell_length_b   2.81
_cell_length_c   7.12
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   MgCrRh2
_chemical_formula_sum   'Mg1 Cr1 Rh2'
_cell_volume   56.38
_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  Mg1  1  0.0  0.0  0.0  1.0
  Cr  Cr0  1  0.0  0.0  0.56  1.0
  Rh  Rh2  1  0.41  0.41  0.92  1.0
  Rh  Rh3  1  0.41  0.41  0.19  1.0

data_MgCrRh2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   3.98
_cell_length_b   3.98
_cell_length_c   7.12
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   MgCrRh2
_chemical_formula_sum   'Mg2 Cr2 Rh4'
_cell_volume   112.77
_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
  Cr  Cr1  2  0.0  0.0  0.56  1.0
  Rh  Rh2  2  0.41  0.0  0.19  1.0
  Rh  Rh3  2  0.41  0.0  0.92  1.0

Mg Cr Rh Rh
Mg Cr Rh Rh 0 2 - o - 0 2 o - - 0 2 o o - 0 3 o o o 0 1 o o - 1 3 - - o 1 3 - o o 1 3 o - o 1 3 o o o 1 2 - - o 1 2 - o o 1 2 o - o 1 2 o o o 1 1 + o o 1 1 o + o 2 3 o o + 
MgCrRh2 crystallizes in the monoclinic Cm space group. Mg(1) is bonded in a 1-coordinate geometry to one Cr(1), one Rh(2), and three equivalent Rh(1) atoms. The Mg(1)-Cr(1) bond length is 3.14 Å. The Mg(1)-Rh(2) bond length is 2.12 Å. There is one shorter (1.71 Å) and two longer (2.09 Å) Mg(1)-Rh(1) bond lengths. Cr(1) is bonded in a 13-coordinate geometry to one Mg(1), four equivalent Cr(1), four equivalent Rh(1), and four equivalent Rh(2) atoms. All Cr(1)-Cr(1) bond lengths are 2.81 Å. There are a spread of Cr(1)-Rh(1) bond distances ranging from 3.07-3.52 Å. There are a spread of Cr(1)-Rh(2) bond distances ranging from 3.07-3.52 Å. There are two inequivalent Rh sites. In the first Rh site, Rh(1) is bonded in a 3-coordinate geometry to three equivalent Mg(1) and four equivalent Cr(1) atoms. In the second Rh site, Rh(2) is bonded in a 1-coordinate geometry to one Mg(1) and four equivalent Cr(1) atoms.