data_NiHgP2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.27
_cell_length_b   5.26
_cell_length_c   3.76
_cell_angle_alpha   69.19
_cell_angle_beta   68.98
_cell_angle_gamma   41.83
_symmetry_Int_Tables_number   1
_chemical_formula_structural   NiHgP2
_chemical_formula_sum   'Ni1 Hg1 P2'
_cell_volume   64.32
_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
  Ni  Ni1  1  0.0  0.0  0.0  1.0
  Hg  Hg0  1  0.65  0.67  0.55  1.0
  P  P2  1  0.0  0.33  0.27  1.0
  P  P3  1  0.65  0.33  0.27  1.0

data_NiHgP2
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.76
_cell_length_b   3.76
_cell_length_c   5.26
_cell_angle_alpha   110.81
_cell_angle_beta   110.81
_cell_angle_gamma   90.31
_symmetry_Int_Tables_number   1
_chemical_formula_structural   NiHgP2
_chemical_formula_sum   'Ni1 Hg1 P2'
_cell_volume   64.32
_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
  Ni  Ni0  1  0.0  0.0  0.0  1.0
  Hg  Hg1  1  0.55  0.35  0.68  1.0
  P  P2  1  0.27  -0.0  0.67  1.0
  P  P3  1  0.27  0.35  0.01  1.0

Ni Hg P P
NiPPHg crystallizes in the triclinic P1 space group. The structure is zero-dimensional and consists of one phosphanylidynenickel molecule and one PHg cluster. In the PHg cluster, Hg(1) is bonded in a distorted single-bond geometry to one P(1) atom. The Hg(1)-P(1) bond length is 1.62 Å. P(1) is bonded in a 1-coordinate geometry to one Hg(1) atom.