data_Cu2C
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.86
_cell_length_b   4.86
_cell_length_c   4.86
_cell_angle_alpha   33.37
_cell_angle_beta   33.37
_cell_angle_gamma   33.37
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Cu2C
_chemical_formula_sum   'Cu2 C1'
_cell_volume   30.95
_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
  Cu  Cu1  1  0.0  0.0  0.42  1.0
  Cu  Cu2  1  0.0  0.0  0.92  1.0
  C  C0  1  0.0  0.0  0.0  1.0

data_Cu2C
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.84
_cell_length_b   2.79
_cell_length_c   4.86
_cell_angle_alpha   90.0
_cell_angle_beta   109.36
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Cu2C
_chemical_formula_sum   'Cu4 C2'
_cell_volume   61.9
_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
  Cu  Cu0  2  -0.0  0.0  0.58  1.0
  Cu  Cu1  2  0.0  0.0  0.08  1.0
  C  C2  2  0.0  0.0  1.0  1.0

Cu Cu C
Cu Cu C 0 0 o + - 0 0 + - o 0 0 + o - 0 2 o o o 0 2 o o + 0 1 o o - 0 1 o o o 1 2 o o + 
Cu2C crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two Cu2C clusters. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a single-bond geometry to one C(1) atom. The Cu(1)-C(1) bond length is 2.02 Å. In the second Cu site, Cu(2) is bonded in a single-bond geometry to one C(1) atom. The Cu(2)-C(1) bond length is 0.39 Å. C(1) is bonded in a single-bond geometry to one Cu(1) and one Cu(2) atom.