data_NaCaHg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.96
_cell_length_b   3.96
_cell_length_c   7.53
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   NaCaHg
_chemical_formula_sum   'Na1 Ca1 Hg1'
_cell_volume   102.12
_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
  Na  Na2  1  0.0  0.0  0.72  1.0
  Ca  Ca0  1  1.0  0.28  0.33  1.0
  Hg  Hg1  1  0.98  0.14  0.48  1.0

data_NaCaHg
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.96
_cell_length_b   3.96
_cell_length_c   7.53
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   NaCaHg
_chemical_formula_sum   'Na1 Ca1 Hg1'
_cell_volume   102.12
_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
  Na  Na0  1  0.0  0.0  0.72  1.0
  Ca  Ca1  1  1.0  0.28  0.33  1.0
  Hg  Hg2  1  0.98  0.14  0.48  1.0

Na Ca Hg
NaCaHg is Cyanogen Chloride-like structured and crystallizes in the triclinic P1 space group. The structure is zero-dimensional and consists of one NaCaHg cluster. Na(1) is bonded in a single-bond geometry to one Hg(1) atom. The Na(1)-Hg(1) bond length is 1.87 Å. Ca(1) is bonded in a single-bond geometry to one Hg(1) atom. The Ca(1)-Hg(1) bond length is 1.25 Å. Hg(1) is bonded in a distorted linear geometry to one Na(1) and one Ca(1) atom.