data_Be2PbBr
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.97
_cell_length_b   4.97
_cell_length_c   3.21
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Be2PbBr
_chemical_formula_sum   'Be2 Pb1 Br1'
_cell_volume   79.28
_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
  Be  Be0  1  0.48  0.0  0.61  1.0
  Be  Be1  1  0.0  0.48  0.61  1.0
  Pb  Pb3  1  0.48  0.48  0.0  1.0
  Br  Br2  1  0.0  0.0  0.0  1.0

data_Be2PbBr
_symmetry_space_group_name_H-M   Cm
_cell_length_a   7.02
_cell_length_b   7.02
_cell_length_c   3.21
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Be2PbBr
_chemical_formula_sum   'Be4 Pb2 Br2'
_cell_volume   158.56
_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
  Be  Be0  4  0.24  0.24  0.61  1.0
  Pb  Pb1  2  0.48  0.0  0.0  1.0
  Br  Br2  2  0.0  0.0  0.0  1.0

Be Be Pb Br
Be2PbBr is alpha Pu-derived structured and crystallizes in the monoclinic Cm space group. Be(1) is bonded in a 5-coordinate geometry to three equivalent Pb(1) and two equivalent Br(1) atoms. There are a spread of Be(1)-Pb(1) bond distances ranging from 2.71-3.09 Å. There is one shorter (2.71 Å) and one longer (2.86 Å) Be(1)-Br(1) bond length. Pb(1) is bonded in a 4-coordinate geometry to six equivalent Be(1) atoms. Br(1) is bonded in a 4-coordinate geometry to four equivalent Be(1) atoms.