data_PtC
_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   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   PtC
_chemical_formula_sum   'Pt4 C4'
_cell_volume   90.75
_cell_formula_units_Z   4
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
  Pt  Pt4  1  0.17  0.41  0.33  1.0
  Pt  Pt5  1  0.08  0.08  0.08  1.0
  Pt  Pt6  1  0.33  0.17  0.41  1.0
  Pt  Pt7  1  0.41  0.33  0.17  1.0
  C  C0  1  0.27  0.52  0.22  1.0
  C  C1  1  0.97  0.97  0.97  1.0
  C  C2  1  0.22  0.27  0.52  1.0
  C  C3  1  0.52  0.22  0.27  1.0

data_PtC
_symmetry_space_group_name_H-M   R3
_cell_length_a   6.36
_cell_length_b   6.36
_cell_length_c   7.78
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   146
_chemical_formula_structural   PtC
_chemical_formula_sum   'Pt12 C12'
_cell_volume   272.24
_cell_formula_units_Z   12
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-y, x-y, z'
  3  '-x+y, -x, z'
  4  'x+1/3, y+2/3, z+2/3'
  5  '-y+1/3, x-y+2/3, z+2/3'
  6  '-x+y+1/3, -x+2/3, z+2/3'
  7  'x+2/3, y+1/3, z+1/3'
  8  '-y+2/3, x-y+1/3, z+1/3'
  9  '-x+y+2/3, -x+1/3, z+1/3'
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
  Pt  Pt0  9  0.02  0.89  0.3  1.0
  Pt  Pt1  3  0.0  0.0  0.08  1.0
  C  C2  9  0.18  0.06  0.34  1.0
  C  C3  3  0.0  0.0  0.97  1.0

Pt Pt Pt Pt C C C C
Pt Pt Pt Pt C C C C 0 4 o o o 1 5 - - - 2 6 o o o 3 7 o o o 
PtC is Cubic alpha N2-like structured and crystallizes in the trigonal R3 space group. The structure is zero-dimensional and consists of six PtC clusters. In three of the PtC clusters, Pt(1) is bonded in a 2-coordinate geometry to two equivalent C(1) atoms. There is one shorter (0.83 Å) and one longer (1.10 Å) Pt(1)-C(1) bond length. C(1) is bonded in an L-shaped geometry to two equivalent Pt(1) atoms. In three of the PtC clusters, Pt(2) is bonded in a single-bond geometry to one C(2) atom. The Pt(2)-C(2) bond length is 0.83 Å. C(2) is bonded in a single-bond geometry to one Pt(2) atom.