data_HfTlPb2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.95
_cell_length_b   5.95
_cell_length_c   5.95
_cell_angle_alpha   134.46
_cell_angle_beta   134.46
_cell_angle_gamma   66.37
_symmetry_Int_Tables_number   1
_chemical_formula_structural   HfTlPb2
_chemical_formula_sum   'Hf1 Tl1 Pb2'
_cell_volume   105.44
_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
  Hf  Hf0  1  0.0  0.0  0.0  1.0
  Tl  Tl3  1  0.0  0.0  0.98  1.0
  Pb  Pb1  1  0.3  0.0  0.49  1.0
  Pb  Pb2  1  0.0  0.3  0.49  1.0

data_HfTlPb2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.51
_cell_length_b   6.51
_cell_length_c   5.95
_cell_angle_alpha   90.0
_cell_angle_beta   123.18
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   HfTlPb2
_chemical_formula_sum   'Hf2 Tl2 Pb4'
_cell_volume   210.89
_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
  Hf  Hf0  2  0.0  0.0  0.0  1.0
  Tl  Tl1  2  0.0  0.0  0.98  1.0
  Pb  Pb2  4  0.35  0.35  0.19  1.0

Hf Tl Pb Pb
HfTlPb2 is Indium-like structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two HfTlPb2 clusters. Hf(1) is bonded in a single-bond geometry to one Tl(1) and two equivalent Pb(1) atoms. The Hf(1)-Tl(1) bond length is 0.14 Å. Both Hf(1)-Pb(1) bond lengths are 2.09 Å. Tl(1) is bonded in a single-bond geometry to one Hf(1) atom. Pb(1) is bonded in a distorted single-bond geometry to one Hf(1) atom.