data_Ni2HgRu
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.47
_cell_length_b   4.47
_cell_length_c   4.94
_cell_angle_alpha   98.73
_cell_angle_beta   98.73
_cell_angle_gamma   36.04
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ni2HgRu
_chemical_formula_sum   'Ni2 Hg1 Ru1'
_cell_volume   57.3
_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
  Ni  Ni1  1  0.16  0.0  0.01  1.0
  Ni  Ni2  1  0.55  0.0  0.87  1.0
  Hg  Hg0  1  0.85  0.0  0.44  1.0
  Ru  Ru3  1  0.0  0.0  0.0  1.0

data_Ni2HgRu
_symmetry_space_group_name_H-M   P1
_cell_length_a   2.76
_cell_length_b   4.47
_cell_length_c   4.94
_cell_angle_alpha   98.73
_cell_angle_beta   90.0
_cell_angle_gamma   108.02
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ni2HgRu
_chemical_formula_sum   'Ni2 Hg1 Ru1'
_cell_volume   57.3
_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
  Ni  Ni0  1  0.0  0.45  0.13  1.0
  Ni  Ni1  1  0.0  0.84  0.99  1.0
  Hg  Hg2  1  0.0  0.15  0.56  1.0
  Ru  Ru3  1  0.0  0.0  0.0  1.0

Ni Ni Hg Ru
RuNi2Hg crystallizes in the triclinic P1 space group. The structure is zero-dimensional and consists of one RuNi2Hg cluster. Ru(1) is bonded in a distorted single-bond geometry to one Ni(1), one Ni(2), and one Hg(1) atom. The Ru(1)-Ni(1) bond length is 0.69 Å. The Ru(1)-Ni(2) bond length is 2.01 Å. The Ru(1)-Hg(1) bond length is 2.36 Å. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a single-bond geometry to one Ru(1) atom. In the second Ni site, Ni(2) is bonded in a 1-coordinate geometry to one Ru(1) atom. Hg(1) is bonded in a 1-coordinate geometry to one Ru(1) atom.