data_Be2CoSn
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.49
_cell_length_b   4.49
_cell_length_c   4.49
_cell_angle_alpha   132.36
_cell_angle_beta   132.36
_cell_angle_gamma   69.67
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Be2CoSn
_chemical_formula_sum   'Be2 Co1 Sn1'
_cell_volume   48.36
_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  0.0  0.81  0.84  1.0
  Be  Be1  1  0.81  0.0  0.84  1.0
  Co  Co2  1  0.0  0.0  0.0  1.0
  Sn  Sn3  1  0.0  0.0  0.68  1.0

data_Be2CoSn
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.12
_cell_length_b   5.12
_cell_length_c   4.49
_cell_angle_alpha   90.0
_cell_angle_beta   124.83
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Be2CoSn
_chemical_formula_sum   'Be4 Co2 Sn2'
_cell_volume   96.71
_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  0.09  0.09  0.03  1.0
  Co  Co1  2  0.0  0.0  0.0  1.0
  Sn  Sn2  2  0.0  0.0  0.68  1.0

Be Be Co Sn
Be2CoSn is Indium-like structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two Be2CoSn clusters. Be(1) is bonded in a single-bond geometry to one Co(1) and one Sn(1) atom. The Be(1)-Co(1) bond length is 0.64 Å. The Be(1)-Sn(1) bond length is 1.42 Å. Co(1) is bonded in a water-like geometry to two equivalent Be(1) atoms. Sn(1) is bonded in a 2-coordinate geometry to two equivalent Be(1) atoms.