data_CuC2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.84
_cell_length_b   4.84
_cell_length_c   4.84
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   CuC2
_chemical_formula_sum   'Cu4 C8'
_cell_volume   113.41
_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
  Cu  Cu8  1  0.42  0.0  0.42  1.0
  Cu  Cu9  1  0.0  0.42  0.42  1.0
  Cu  Cu10  1  0.0  0.0  0.0  1.0
  Cu  Cu11  1  0.42  0.42  0.0  1.0
  C  C0  1  0.38  0.8  0.46  1.0
  C  C1  1  0.46  0.04  0.38  1.0
  C  C2  1  0.8  0.46  0.38  1.0
  C  C3  1  0.04  0.38  0.46  1.0
  C  C4  1  0.46  0.38  0.8  1.0
  C  C5  1  0.38  0.46  0.04  1.0
  C  C6  1  0.04  0.04  0.04  1.0
  C  C7  1  0.8  0.8  0.8  1.0

data_CuC2
_symmetry_space_group_name_H-M   R3
_cell_length_a   6.85
_cell_length_b   6.85
_cell_length_c   8.38
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   146
_chemical_formula_structural   CuC2
_chemical_formula_sum   'Cu12 C24'
_cell_volume   340.24
_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
  Cu  Cu0  9  0.05  0.53  0.95  1.0
  Cu  Cu1  3  0.0  0.0  0.0  1.0
  C  C2  9  0.08  0.5  0.96  1.0
  C  C3  9  0.17  0.75  0.21  1.0
  C  C4  3  0.0  0.0  0.04  1.0
  C  C5  3  0.0  0.0  0.8  1.0

Cu Cu Cu Cu C C C C C C C C
CuCC crystallizes in the trigonal R3 space group. The structure is zero-dimensional and consists of twelve CuCC clusters. Cu(1) is bonded in a distorted bent 150 degrees geometry to one C(1) and one C(2) atom. The Cu(1)-C(1) bond length is 1.00 Å. The Cu(1)-C(2) bond length is 0.33 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded in a single-bond geometry to one Cu(1) atom. In the second C site, C(2) is bonded in a single-bond geometry to one Cu(1) atom.