data_Li2CuHg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.73
_cell_length_b   4.73
_cell_length_c   4.73
_cell_angle_alpha   129.34
_cell_angle_beta   129.34
_cell_angle_gamma   74.47
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Li2CuHg
_chemical_formula_sum   'Li2 Cu1 Hg1'
_cell_volume   61.81
_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
  Li  Li2  1  0.02  0.0  0.88  1.0
  Li  Li3  1  0.0  0.02  0.88  1.0
  Cu  Cu0  1  0.0  0.0  0.0  1.0
  Hg  Hg1  1  0.0  0.0  0.77  1.0

data_Li2CuHg
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.73
_cell_length_b   5.73
_cell_length_c   4.73
_cell_angle_alpha   90.0
_cell_angle_beta   127.23
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Li2CuHg
_chemical_formula_sum   'Li4 Cu2 Hg2'
_cell_volume   123.62
_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
  Li  Li0  4  0.13  0.01  0.14  1.0
  Cu  Cu1  2  0.0  0.0  0.0  1.0
  Hg  Hg2  2  0.23  0.0  0.23  1.0

Li Li Cu Hg
Li2CuHg is Copper structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two Li2CuHg clusters. Li(1) is bonded in a single-bond geometry to one Li(1), one Cu(1), and one Hg(1) atom. The Li(1)-Li(1) bond length is 0.14 Å. The Li(1)-Cu(1) bond length is 0.63 Å. The Li(1)-Hg(1) bond length is 0.48 Å. Cu(1) is bonded in a 2-coordinate geometry to two equivalent Li(1) atoms. Hg(1) is bonded in a 2-coordinate geometry to two equivalent Li(1) atoms.