data_K3Hg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.94
_cell_length_b   5.94
_cell_length_c   5.68
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.58
_symmetry_Int_Tables_number   1
_chemical_formula_structural   K3Hg
_chemical_formula_sum   'K3 Hg1'
_cell_volume   200.65
_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
  K  K1  1  0.09  0.11  0.84  1.0
  K  K2  1  0.09  0.89  0.84  1.0
  K  K3  1  0.0  0.0  0.0  1.0
  Hg  Hg0  1  0.18  0.0  0.0  1.0

data_K3Hg
_symmetry_space_group_name_H-M   Pm
_cell_length_a   5.68
_cell_length_b   5.94
_cell_length_c   5.94
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   6
_chemical_formula_structural   K3Hg
_chemical_formula_sum   'K3 Hg1'
_cell_volume   200.66
_cell_formula_units_Z   1
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
  K  K0  2  0.84  0.11  0.09  1.0
  K  K1  1  0.0  0.0  0.0  1.0
  Hg  Hg2  1  0.0  0.0  0.18  1.0

K K K Hg
K3Hg is alpha Po structured and crystallizes in the monoclinic Pm space group. The structure is zero-dimensional and consists of one K3Hg cluster. There are two inequivalent K sites. In the first K site, K(1) is bonded in a distorted single-bond geometry to one Hg(1) atom. The K(1)-Hg(1) bond length is 1.24 Å. In the second K site, K(2) is bonded in a single-bond geometry to one Hg(1) atom. The K(2)-Hg(1) bond length is 1.07 Å. Hg(1) is bonded in a 3-coordinate geometry to one K(2) and two equivalent K(1) atoms.