data_YHgCl2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.78
_cell_length_b   10.78
_cell_length_c   10.78
_cell_angle_alpha   19.91
_cell_angle_beta   19.91
_cell_angle_gamma   19.91
_symmetry_Int_Tables_number   1
_chemical_formula_structural   YHgCl2
_chemical_formula_sum   'Y1 Hg1 Cl2'
_cell_volume   127.27
_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
  Y  Y3  1  0.0  0.0  0.0  1.0
  Hg  Hg2  1  0.0  0.0  0.85  1.0
  Cl  Cl0  1  0.0  0.0  0.83  1.0
  Cl  Cl1  1  0.0  0.0  0.87  1.0

data_YHgCl2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.46
_cell_length_b   3.73
_cell_length_c   10.78
_cell_angle_alpha   90.0
_cell_angle_beta   101.52
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   YHgCl2
_chemical_formula_sum   'Y2 Hg2 Cl4'
_cell_volume   254.55
_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
  Y  Y0  2  0.0  0.0  0.0  1.0
  Hg  Hg1  2  0.0  0.0  0.15  1.0
  Cl  Cl2  2  0.0  0.0  0.13  1.0
  Cl  Cl3  2  0.0  0.0  0.17  1.0

Y Hg Cl Cl
YHgCl2 is Cyanogen Chloride-like structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two YHgCl2 clusters. Y(1) is bonded in a single-bond geometry to one Cl(2) atom. The Y(1)-Cl(2) bond length is 1.41 Å. Hg(1) is bonded in a linear geometry to one Cl(1) and one Cl(2) atom. The Hg(1)-Cl(1) bond length is 0.20 Å. The Hg(1)-Cl(2) bond length is 0.20 Å. There are two inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a single-bond geometry to one Hg(1) atom. In the second Cl site, Cl(2) is bonded in a linear geometry to one Y(1) and one Hg(1) atom.