The compound described by Mg2RuH4 crystallizes in the orthorhombic Cmcm space group. Mg(1) is bonded in a 4-coordinate geometry to four equivalent H(1) and four equivalent H(2) atoms. Ru(1) is bonded in a 4-coordinate geometry to two equivalent H(1) and two equivalent H(2) atoms. There are two inequivalent H sites. In the first H site, H(1) is bonded to four equivalent Mg(1) and one Ru(1) atom to form a mixture of distorted corner, edge, and face-sharing HMg4Ru square pyramids. In the second H site, H(2) is bonded to four equivalent Mg(1) and one Ru(1) atom to form a mixture of distorted corner, edge, and face-sharing HMg4Ru square pyramids. is represented by the CIF file [CIF]
data_Mg2H4Ru
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.443
_cell_length_b   5.443
_cell_length_c   4.793
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   79.480
_symmetry_Int_Tables_number   1
_cell_volume   139.594
_cell_formula_units_Z   2
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  Mg0  1  0.068  0.649  0.250  1.0
  Mg  Mg1  1  0.351  0.932  0.750  1.0
  Mg  Mg2  1  0.932  0.351  0.750  1.0
  Mg  Mg3  1  0.649  0.068  0.250  1.0
  H  H4  1  0.353  0.871  0.250  1.0
  H  H5  1  0.129  0.647  0.750  1.0
  H  H6  1  0.647  0.129  0.750  1.0
  H  H7  1  0.871  0.353  0.250  1.0
  H  H8  1  0.278  0.278  0.015  1.0
  H  H9  1  0.722  0.722  0.985  1.0
  H  H10  1  0.278  0.278  0.485  1.0
  H  H11  1  0.722  0.722  0.515  1.0
  Ru  Ru12  1  0.132  0.132  0.250  1.0
  Ru  Ru13  1  0.868  0.868  0.750  1.0
[/CIF]
.
The compound described by Mg2RuH4 crystallizes in the orthorhombic Cmcm space group. Mg(1) is bonded in a 4-coordinate geometry to four equivalent H(1) and four equivalent H(2) atoms. Ru(1) is bonded in a 4-coordinate geometry to two equivalent H(1) and two equivalent H(2) atoms. There are two inequivalent H sites. In the first H site, H(1) is bonded to four equivalent Mg(1) and one Ru(1) atom to form a mixture of distorted corner, edge, and face-sharing HMg4Ru square pyramids. In the second H site, H(2) is bonded to four equivalent Mg(1) and one Ru(1) atom to form a mixture of distorted corner, edge, and face-sharing HMg4Ru square pyramids. is represented by the CIF file [CIF]
data_Mg2H4Ru
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.443
_cell_length_b   5.443
_cell_length_c   4.793
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   79.480
_symmetry_Int_Tables_number   1
_cell_volume   139.594
_cell_formula_units_Z   2
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  Mg0  1  0.068  0.649  0.250  1.0
  Mg  Mg1  1  0.351  0.932  0.750  1.0
  Mg  Mg2  1  0.932  0.351  0.750  1.0
  Mg  Mg3  1  0.649  0.068  0.250  1.0
  H  H4  1  0.353  0.871  0.250  1.0
  H  H5  1  0.129  0.647  0.750  1.0
  H  H6  1  0.647  0.129  0.750  1.0
  H  H7  1  0.871  0.353  0.250  1.0
  H  H8  1  0.278  0.278  0.015  1.0
  H  H9  1  0.722  0.722  0.985  1.0
  H  H10  1  0.278  0.278  0.485  1.0
  H  H11  1  0.722  0.722  0.515  1.0
  Ru  Ru12  1  0.132  0.132  0.250  1.0
  Ru  Ru13  1  0.868  0.868  0.750  1.0
[/CIF]
.