data_Sn2PdSe
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.26
_cell_length_b   5.26
_cell_length_c   5.26
_cell_angle_alpha   127.33
_cell_angle_beta   127.33
_cell_angle_gamma   77.71
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Sn2PdSe
_chemical_formula_sum   'Sn2 Pd1 Se1'
_cell_volume   89.21
_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
  Sn  Sn2  1  0.33  0.0  0.05  1.0
  Sn  Sn3  1  0.0  0.33  0.05  1.0
  Pd  Pd0  1  0.0  0.0  0.1  1.0
  Se  Se1  1  0.0  0.0  0.0  1.0

data_Sn2PdSe
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.6
_cell_length_b   6.6
_cell_length_c   5.26
_cell_angle_alpha   90.0
_cell_angle_beta   128.86
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Sn2PdSe
_chemical_formula_sum   'Sn4 Pd2 Se2'
_cell_volume   178.43
_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
  Sn  Sn0  4  0.33  0.33  0.71  1.0
  Pd  Pd1  2  0.0  0.0  0.1  1.0
  Se  Se2  2  0.0  0.0  0.0  1.0

Sn Sn Pd Se
PdSn2Se is Copper structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two PdSn2Se clusters. Pd(1) is bonded in a single-bond geometry to one Se(1) atom. The Pd(1)-Se(1) bond length is 0.51 Å. Sn(1) is bonded in a single-bond geometry to one Se(1) atom. The Sn(1)-Se(1) bond length is 1.61 Å. Se(1) is bonded in a distorted single-bond geometry to one Pd(1) and two equivalent Sn(1) atoms.