data_MgHgP2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.26
_cell_length_b   3.26
_cell_length_c   7.32
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   MgHgP2
_chemical_formula_sum   'Mg1 Hg1 P2'
_cell_volume   77.81
_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
  Mg  Mg1  1  0.0  0.0  0.74  1.0
  Hg  Hg0  1  0.63  0.63  0.82  1.0
  P  P2  1  0.63  0.63  0.32  1.0
  P  P3  1  0.0  0.0  0.09  1.0

data_MgHgP2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.61
_cell_length_b   4.61
_cell_length_c   7.32
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   MgHgP2
_chemical_formula_sum   'Mg2 Hg2 P4'
_cell_volume   155.61
_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
  Mg  Mg0  2  0.0  0.0  0.74  1.0
  Hg  Hg1  2  0.13  0.5  0.82  1.0
  P  P2  2  0.0  0.0  0.09  1.0
  P  P3  2  0.13  0.5  0.32  1.0

Mg Hg P P
MgHgP2 crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two MgHgP2 clusters. Mg(1) is bonded in a 1-coordinate geometry to one Hg(1) and one P(2) atom. The Mg(1)-Hg(1) bond length is 1.80 Å. The Mg(1)-P(2) bond length is 2.56 Å. Hg(1) is bonded in a 1-coordinate geometry to one Mg(1) and one P(2) atom. The Hg(1)-P(2) bond length is 2.62 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded in a single-bond geometry to one P(2) atom. The P(1)-P(2) bond length is 2.36 Å. In the second P site, P(2) is bonded in a 3-coordinate geometry to one Mg(1), one Hg(1), and one P(1) atom.