data_TlCl
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.73
_cell_length_b   6.48
_cell_length_c   4.5
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   TlCl
_chemical_formula_sum   'Tl2 Cl2'
_cell_volume   137.92
_cell_formula_units_Z   2
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  0.37  0.0  0.04  1.0
  Tl  Tl3  1  0.0  0.24  0.46  1.0
  Cl  Cl0  1  0.0  0.0  0.26  1.0
  Cl  Cl1  1  0.37  0.24  0.24  1.0

data_TlCl
_symmetry_space_group_name_H-M   P-1
_cell_length_a   4.5
_cell_length_b   4.73
_cell_length_c   6.48
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   2
_chemical_formula_structural   TlCl
_chemical_formula_sum   'Tl2 Cl2'
_cell_volume   137.92
_cell_formula_units_Z   2
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
  Tl  Tl0  2  0.21  0.82  0.12  1.0
  Cl  Cl1  2  0.01  0.82  0.88  1.0

Tl Tl Cl Cl
TlCl is Indium-like structured and crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of one TlCl cluster. Tl(1) is bonded in a 2-coordinate geometry to two equivalent Cl(1) atoms. There is one shorter (1.81 Å) and one longer (1.99 Å) Tl(1)-Cl(1) bond length. Cl(1) is bonded in a distorted water-like geometry to two equivalent Tl(1) atoms.