data_YTl
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.68
_cell_length_b   3.68
_cell_length_c   8.65
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   YTl
_chemical_formula_sum   'Y2 Tl2'
_cell_volume   117.2
_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
  Y  Y2  1  0.84  0.0  0.21  1.0
  Y  Y3  1  0.0  0.84  0.44  1.0
  Tl  Tl0  1  0.84  0.0  0.33  1.0
  Tl  Tl1  1  0.0  0.84  0.32  1.0

data_YTl
_symmetry_space_group_name_H-M   C2/m
_cell_length_a   5.21
_cell_length_b   5.21
_cell_length_c   8.65
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   12
_chemical_formula_structural   YTl
_chemical_formula_sum   'Y4 Tl4'
_cell_volume   234.4
_cell_formula_units_Z   4
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-x, -y, -z'
  3  '-x, y, -z'
  4  'x, -y, z'
  5  'x+1/2, y+1/2, z'
  6  '-x+1/2, -y+1/2, -z'
  7  '-x+1/2, y+1/2, -z'
  8  '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
  Y  Y0  4  0.08  0.0  0.12  1.0
  Tl  Tl1  4  0.08  0.0  1.0  1.0

Y Y Tl Tl
YTl crystallizes in the monoclinic C2/m space group. The structure is zero-dimensional and consists of two YTl clusters. Y(1) is bonded in a distorted single-bond geometry to two equivalent Tl(1) atoms. There is one shorter (1.04 Å) and one longer (1.27 Å) Y(1)-Tl(1) bond length. Tl(1) is bonded in a 3-coordinate geometry to two equivalent Y(1) and one Tl(1) atom. The Tl(1)-Tl(1) bond length is 0.83 Å.