data_LaCu2Si
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.38
_cell_length_b   4.38
_cell_length_c   4.0
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   LaCu2Si
_chemical_formula_sum   'La1 Cu2 Si1'
_cell_volume   76.72
_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  La2  1  0.19  0.19  0.0  1.0
  Cu  Cu0  1  0.0  0.19  0.0  1.0
  Cu  Cu1  1  0.19  0.0  0.0  1.0
  Si  Si3  1  0.0  0.0  0.0  1.0

data_LaCu2Si
_symmetry_space_group_name_H-M   Amm2
_cell_length_a   4.0
_cell_length_b   6.19
_cell_length_c   6.19
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   38
_chemical_formula_structural   LaCu2Si
_chemical_formula_sum   'La2 Cu4 Si2'
_cell_volume   153.44
_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, y, z'
  4  'x, -y, z'
  5  'x, y+1/2, z+1/2'
  6  '-x, -y+1/2, z+1/2'
  7  '-x, y+1/2, z+1/2'
  8  'x, -y+1/2, z+1/2'
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  0.19  1.0
  Cu  Cu1  4  0.0  0.09  0.09  1.0
  Si  Si2  2  0.0  0.0  0.0  1.0

La Cu Cu Si
LaCu2Si is alpha Po structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two LaCu2Si clusters. La(1) is bonded in an L-shaped geometry to two equivalent Cu(1) atoms. Both La(1)-Cu(1) bond lengths are 0.83 Å. Cu(1) is bonded in a distorted single-bond geometry to one La(1) and one Si(1) atom. The Cu(1)-Si(1) bond length is 0.83 Å. Si(1) is bonded in an L-shaped geometry to two equivalent Cu(1) atoms.