data_BaCoHg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.29
_cell_length_b   6.29
_cell_length_c   6.29
_cell_angle_alpha   145.45
_cell_angle_beta   145.45
_cell_angle_gamma   49.66
_symmetry_Int_Tables_number   1
_chemical_formula_structural   BaCoHg
_chemical_formula_sum   'Ba1 Co1 Hg1'
_cell_volume   79.68
_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
  Ba  Ba0  1  0.0  0.0  0.01  1.0
  Co  Co1  1  0.0  0.0  0.25  1.0
  Hg  Hg2  1  0.0  0.0  0.16  1.0

data_BaCoHg
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.28
_cell_length_b   5.28
_cell_length_c   6.29
_cell_angle_alpha   90.0
_cell_angle_beta   114.83
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   BaCoHg
_chemical_formula_sum   'Ba2 Co2 Hg2'
_cell_volume   159.36
_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
  Ba  Ba0  2  0.0  0.0  0.99  1.0
  Co  Co1  2  0.0  0.0  0.75  1.0
  Hg  Hg2  2  0.0  0.0  0.84  1.0

Ba Co Hg
BaCoHg is Cyanogen Chloride-like structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two BaCoHg clusters. Ba(1) is bonded in a single-bond geometry to one Hg(1) atom. The Ba(1)-Hg(1) bond length is 0.90 Å. Co(1) is bonded in a single-bond geometry to one Hg(1) atom. The Co(1)-Hg(1) bond length is 0.55 Å. Hg(1) is bonded in a linear geometry to one Ba(1) and one Co(1) atom.