data_NiAs2Pt
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.07
_cell_length_b   3.07
_cell_length_c   6.44
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   NiAs2Pt
_chemical_formula_sum   'Ni1 As2 Pt1'
_cell_volume   60.57
_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  Ni2  1  0.0  0.0  0.0  1.0
  As  As0  1  0.53  0.53  0.95  1.0
  As  As1  1  0.53  0.53  0.49  1.0
  Pt  Pt3  1  0.0  0.0  0.22  1.0

data_NiAs2Pt
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.34
_cell_length_b   4.34
_cell_length_c   6.44
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   NiAs2Pt
_chemical_formula_sum   'Ni2 As4 Pt2'
_cell_volume   121.13
_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
  Ni  Ni0  2  0.0  0.0  0.0  1.0
  As  As1  2  0.03  0.5  0.49  1.0
  As  As2  2  0.03  0.5  0.95  1.0
  Pt  Pt3  2  0.0  0.0  0.22  1.0

Ni As As Pt
PtNiAs2 crystallizes in the monoclinic Cm space group. Pt(1) is bonded in a single-bond geometry to one Ni(1) and four equivalent As(2) atoms. The Pt(1)-Ni(1) bond length is 1.43 Å. There are a spread of Pt(1)-As(2) bond distances ranging from 2.66-2.89 Å. Ni(1) is bonded in a distorted single-bond geometry to one Pt(1) and four equivalent As(1) atoms. There are a spread of Ni(1)-As(1) bond distances ranging from 2.05-2.33 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded in a distorted square co-planar geometry to four equivalent Ni(1) and one As(2) atom. The As(1)-As(2) bond length is 2.98 Å. In the second As site, As(2) is bonded in a 9-coordinate geometry to four equivalent Pt(1), one As(1), and four equivalent As(2) atoms. All As(2)-As(2) bond lengths are 3.07 Å.