data_AlHgPd2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.65
_cell_length_b   8.65
_cell_length_c   8.65
_cell_angle_alpha   20.29
_cell_angle_beta   20.29
_cell_angle_gamma   20.29
_symmetry_Int_Tables_number   1
_chemical_formula_structural   AlHgPd2
_chemical_formula_sum   'Al1 Hg1 Pd2'
_cell_volume   68.02
_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
  Al  Al0  1  0.0  0.0  0.0  1.0
  Hg  Hg1  1  0.0  0.0  0.7  1.0
  Pd  Pd2  1  0.0  0.0  0.78  1.0
  Pd  Pd3  1  0.0  0.0  0.62  1.0

data_AlHgPd2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.28
_cell_length_b   3.05
_cell_length_c   8.65
_cell_angle_alpha   90.0
_cell_angle_beta   101.74
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   AlHgPd2
_chemical_formula_sum   'Al2 Hg2 Pd4'
_cell_volume   136.03
_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
  Al  Al0  2  0.0  0.0  0.0  1.0
  Hg  Hg1  2  0.0  0.0  0.3  1.0
  Pd  Pd2  2  0.0  0.0  0.22  1.0
  Pd  Pd3  2  0.0  0.0  0.38  1.0

Al Hg Pd Pd
Al Hg Pd Pd 0 2 o o - 1 3 o o o 1 2 o o o 
Pd2HgAl is Cyanogen Chloride-like structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two Pd2HgAl clusters. There are two inequivalent Pd sites. In the first Pd site, Pd(1) is bonded in a distorted linear geometry to one Hg(1) and one Al(1) atom. The Pd(1)-Hg(1) bond length is 0.69 Å. The Pd(1)-Al(1) bond length is 1.92 Å. In the second Pd site, Pd(2) is bonded in a single-bond geometry to one Hg(1) atom. The Pd(2)-Hg(1) bond length is 0.69 Å. Hg(1) is bonded in a linear geometry to one Pd(1) and one Pd(2) atom. Al(1) is bonded in a single-bond geometry to one Pd(1) atom.