data_CoNiHg2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.36
_cell_length_b   4.36
_cell_length_c   3.27
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   CoNiHg2
_chemical_formula_sum   'Co1 Ni1 Hg2'
_cell_volume   62.22
_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
  Co  Co0  1  0.0  0.0  0.0  1.0
  Ni  Ni3  1  0.18  0.18  0.0  1.0
  Hg  Hg1  1  0.0  0.18  0.63  1.0
  Hg  Hg2  1  0.18  0.0  0.63  1.0

data_CoNiHg2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.17
_cell_length_b   6.17
_cell_length_c   3.27
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   CoNiHg2
_chemical_formula_sum   'Co2 Ni2 Hg4'
_cell_volume   124.44
_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
  Co  Co0  2  0.0  0.0  0.0  1.0
  Ni  Ni1  2  0.18  0.0  0.0  1.0
  Hg  Hg2  4  0.09  0.09  0.63  1.0

Co Ni Hg Hg
CoNiHg2 crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two CoNiHg2 clusters. Co(1) is bonded in a distorted single-bond geometry to one Ni(1) and two equivalent Hg(1) atoms. The Co(1)-Ni(1) bond length is 1.12 Å. Both Co(1)-Hg(1) bond lengths are 1.43 Å. Ni(1) is bonded in a distorted single-bond geometry to one Co(1) and two equivalent Hg(1) atoms. Both Ni(1)-Hg(1) bond lengths are 1.43 Å. Hg(1) is bonded in a 3-coordinate geometry to one Co(1), one Ni(1), and one Hg(1) atom. The Hg(1)-Hg(1) bond length is 1.12 Å.