data_MgCoRu2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.69
_cell_length_b   2.69
_cell_length_c   7.63
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   MgCoRu2
_chemical_formula_sum   'Mg1 Co1 Ru2'
_cell_volume   55.19
_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
  Co  Co0  1  0.0  0.0  0.81  1.0
  Ru  Ru2  1  0.35  0.35  0.12  1.0
  Ru  Ru3  1  0.35  0.35  0.5  1.0

data_MgCoRu2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   3.8
_cell_length_b   3.8
_cell_length_c   7.63
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   MgCoRu2
_chemical_formula_sum   'Mg2 Co2 Ru4'
_cell_volume   110.38
_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
  Co  Co1  2  0.0  0.0  0.81  1.0
  Ru  Ru2  2  0.35  0.0  0.12  1.0
  Ru  Ru3  2  0.35  0.0  0.5  1.0

Mg Co Ru Ru
MgRu2Co crystallizes in the monoclinic Cm space group. Mg(1) is bonded in a 2-coordinate geometry to one Ru(1) and one Co(1) atom. The Mg(1)-Ru(1) bond length is 1.61 Å. The Mg(1)-Co(1) bond length is 1.42 Å. There are two inequivalent Ru sites. In the first Ru site, Ru(1) is bonded in a 1-coordinate geometry to one Mg(1) and one Ru(2) atom. The Ru(1)-Ru(2) bond length is 2.91 Å. In the second Ru site, Ru(2) is bonded in a 8-coordinate geometry to one Ru(1), four equivalent Ru(2), and three equivalent Co(1) atoms. All Ru(2)-Ru(2) bond lengths are 2.69 Å. There is one shorter (2.70 Å) and two longer (3.09 Å) Ru(2)-Co(1) bond lengths. Co(1) is bonded in a single-bond geometry to one Mg(1) and three equivalent Ru(2) atoms.