data_PdC2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.93
_cell_length_b   3.93
_cell_length_c   5.91
_cell_angle_alpha   104.72
_cell_angle_beta   104.72
_cell_angle_gamma   47.2
_symmetry_Int_Tables_number   1
_chemical_formula_structural   PdC2
_chemical_formula_sum   'Pd2 C4'
_cell_volume   64.33
_cell_formula_units_Z   2
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
  Pd  Pd4  1  0.41  0.0  0.32  1.0
  Pd  Pd5  1  0.15  0.0  0.36  1.0
  C  C0  1  0.81  0.0  0.13  1.0
  C  C1  1  0.27  0.0  0.14  1.0
  C  C2  1  0.29  0.0  0.54  1.0
  C  C3  1  0.75  0.0  0.55  1.0

data_PdC2
_symmetry_space_group_name_H-M   P-1
_cell_length_a   3.15
_cell_length_b   3.93
_cell_length_c   5.91
_cell_angle_alpha   104.72
_cell_angle_beta   90.0
_cell_angle_gamma   113.6
_symmetry_Int_Tables_number   2
_chemical_formula_structural   PdC2
_chemical_formula_sum   'Pd2 C4'
_cell_volume   64.33
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-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
  Pd  Pd0  2  0.0  0.37  0.52  1.0
  C  C1  2  0.0  0.03  0.29  1.0
  C  C2  2  0.0  0.49  0.3  1.0

Pd Pd C C C C
PdC2 crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of two PdC2 clusters. Pd(1) is bonded in a 1-coordinate geometry to one C(1) and one C(2) atom. The Pd(1)-C(1) bond length is 1.65 Å. The Pd(1)-C(2) bond length is 1.05 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded in a distorted single-bond geometry to one Pd(1) atom. In the second C site, C(2) is bonded in a distorted single-bond geometry to one Pd(1) atom.