data_Fe2CoHg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.76
_cell_length_b   3.76
_cell_length_c   3.89
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Fe2CoHg
_chemical_formula_sum   'Fe2 Co1 Hg1'
_cell_volume   55.19
_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
  Fe  Fe1  1  0.0  0.88  0.95  1.0
  Fe  Fe2  1  0.88  0.0  0.95  1.0
  Co  Co0  1  0.0  0.0  0.0  1.0
  Hg  Hg3  1  0.88  0.88  0.0  1.0

data_Fe2CoHg
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.32
_cell_length_b   5.32
_cell_length_c   3.89
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Fe2CoHg
_chemical_formula_sum   'Fe4 Co2 Hg2'
_cell_volume   110.38
_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
  Fe  Fe0  4  0.44  0.44  0.95  1.0
  Co  Co1  2  0.0  0.0  0.0  1.0
  Hg  Hg2  2  0.38  0.5  0.0  1.0

Fe Fe Co Hg
Fe2CoHg is alpha Po structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two Fe2CoHg clusters. Fe(1) is bonded in a distorted L-shaped geometry to one Co(1) and one Hg(1) atom. The Fe(1)-Co(1) bond length is 0.49 Å. The Fe(1)-Hg(1) bond length is 0.49 Å. Co(1) is bonded in a 2-coordinate geometry to two equivalent Fe(1) atoms. Hg(1) is bonded in a distorted L-shaped geometry to two equivalent Fe(1) atoms.