data_La2AlSe
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.58
_cell_length_b   3.58
_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   La2AlSe
_chemical_formula_sum   'La2 Al1 Se1'
_cell_volume   110.71
_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
  La  La1  1  0.79  0.79  0.09  1.0
  La  La2  1  0.0  0.0  0.78  1.0
  Al  Al0  1  0.0  0.0  0.04  1.0
  Se  Se3  1  0.79  0.79  0.71  1.0

data_La2AlSe
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.06
_cell_length_b   5.06
_cell_length_c   8.65
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   La2AlSe
_chemical_formula_sum   'La4 Al2 Se2'
_cell_volume   221.41
_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
  La  La0  2  0.0  0.0  0.78  1.0
  La  La1  2  0.29  0.5  0.09  1.0
  Al  Al2  2  0.0  0.0  0.04  1.0
  Se  Se3  2  0.29  0.5  0.71  1.0

La La Al Se
LaAlLaSe crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two LaAl clusters and two LaSe clusters. In each LaAl cluster, La(1) is bonded in a single-bond geometry to one Al(1) atom. The La(1)-Al(1) bond length is 1.16 Å. Al(1) is bonded in a 1-coordinate geometry to one La(1) atom. In each LaSe cluster, La(2) is bonded in a distorted single-bond geometry to one Se(1) atom. The La(2)-Se(1) bond length is 1.21 Å. Se(1) is bonded in a single-bond geometry to one La(2) atom.