data_TlSiHg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.34
_cell_length_b   6.34
_cell_length_c   6.34
_cell_angle_alpha   147.31
_cell_angle_beta   147.31
_cell_angle_gamma   46.91
_symmetry_Int_Tables_number   1
_chemical_formula_structural   TlSiHg
_chemical_formula_sum   'Tl1 Si1 Hg1'
_cell_volume   74.11
_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
  Tl  Tl2  1  0.0  0.0  0.84  1.0
  Si  Si1  1  0.0  0.0  0.14  1.0
  Hg  Hg0  1  0.0  0.0  0.29  1.0

data_TlSiHg
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.05
_cell_length_b   5.05
_cell_length_c   6.34
_cell_angle_alpha   90.0
_cell_angle_beta   113.45
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   TlSiHg
_chemical_formula_sum   'Tl2 Si2 Hg2'
_cell_volume   148.22
_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
  Tl  Tl0  2  0.0  0.0  0.16  1.0
  Si  Si1  2  0.0  0.0  0.86  1.0
  Hg  Hg2  2  0.0  0.0  0.71  1.0

Tl Si Hg
HgTlSi is Cyanogen Chloride-like structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two HgTlSi clusters. Hg(1) is bonded in a single-bond geometry to one Si(1) atom. The Hg(1)-Si(1) bond length is 0.92 Å. Tl(1) is bonded in a single-bond geometry to one Si(1) atom. The Tl(1)-Si(1) bond length is 1.90 Å. Si(1) is bonded in a linear geometry to one Hg(1) and one Tl(1) atom.