data_Ni2HgRu
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.96
_cell_length_b   2.96
_cell_length_c   6.44
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ni2HgRu
_chemical_formula_sum   'Ni2 Hg1 Ru1'
_cell_volume   56.53
_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  0.0  0.0  0.27  1.0
  Ni  Ni2  1  0.48  0.48  0.57  1.0
  Hg  Hg0  1  0.48  0.48  0.94  1.0
  Ru  Ru3  1  0.0  0.0  0.89  1.0

data_Ni2HgRu
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.19
_cell_length_b   4.19
_cell_length_c   6.44
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Ni2HgRu
_chemical_formula_sum   'Ni4 Hg2 Ru2'
_cell_volume   113.06
_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
  Ni  Ni0  2  0.0  0.0  0.27  1.0
  Ni  Ni1  2  0.48  0.0  0.57  1.0
  Hg  Hg2  2  0.48  0.0  0.94  1.0
  Ru  Ru3  2  0.0  0.0  0.89  1.0

Ni Ni Hg Ru
RuNi2Hg crystallizes in the monoclinic Cm space group. Ru(1) is bonded in a 5-coordinate geometry to one Ni(1), four equivalent Ni(2), and four equivalent Hg(1) atoms. The Ru(1)-Ni(1) bond length is 2.44 Å. There are a spread of Ru(1)-Ni(2) bond distances ranging from 2.89-3.01 Å. There are a spread of Ru(1)-Hg(1) bond distances ranging from 2.04-2.20 Å. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a distorted single-bond geometry to one Ru(1) and four equivalent Ni(2) atoms. There are a spread of Ni(1)-Ni(2) bond distances ranging from 2.79-2.91 Å. In the second Ni site, Ni(2) is bonded in a 13-coordinate geometry to four equivalent Ru(1), four equivalent Ni(1), four equivalent Ni(2), and one Hg(1) atom. All Ni(2)-Ni(2) bond lengths are 2.96 Å. The Ni(2)-Hg(1) bond length is 2.39 Å. Hg(1) is bonded in a 5-coordinate geometry to four equivalent Ru(1) and one Ni(2) atom.