data_HgRu2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.39
_cell_length_b   5.39
_cell_length_c   6.87
_cell_angle_alpha   105.11
_cell_angle_beta   105.11
_cell_angle_gamma   30.41
_symmetry_Int_Tables_number   1
_chemical_formula_structural   HgRu2
_chemical_formula_sum   'Hg2 Ru4'
_cell_volume   97.3
_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
  Hg  Hg0  1  0.98  0.0  0.4  1.0
  Hg  Hg1  1  0.57  0.0  0.22  1.0
  Ru  Ru2  1  0.86  0.0  0.4  1.0
  Ru  Ru3  1  0.68  0.0  0.21  1.0
  Ru  Ru4  1  0.54  0.0  0.52  1.0
  Ru  Ru5  1  0.0  0.0  0.1  1.0

data_HgRu2
_symmetry_space_group_name_H-M   P-1
_cell_length_a   2.83
_cell_length_b   5.39
_cell_length_c   6.87
_cell_angle_alpha   105.11
_cell_angle_beta   90.0
_cell_angle_gamma   105.2
_symmetry_Int_Tables_number   2
_chemical_formula_structural   HgRu2
_chemical_formula_sum   'Hg2 Ru4'
_cell_volume   97.3
_cell_formula_units_Z   2
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
  Hg  Hg0  2  0.0  0.21  0.59  1.0
  Ru  Ru1  2  0.0  0.09  0.59  1.0
  Ru  Ru2  2  0.0  0.23  0.29  1.0

Hg Hg Ru Ru Ru Ru
Ru2Hg crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of two Ru2Hg clusters. There are two inequivalent Ru sites. In the first Ru site, Ru(1) is bonded in a distorted single-bond geometry to one Hg(1) atom. The Ru(1)-Hg(1) bond length is 0.63 Å. In the second Ru site, Ru(2) is bonded in a 1-coordinate geometry to one Hg(1) atom. The Ru(2)-Hg(1) bond length is 2.12 Å. Hg(1) is bonded in a single-bond geometry to one Ru(1) and one Ru(2) atom.