data_CoC2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.7
_cell_length_b   4.7
_cell_length_c   4.7
_cell_angle_alpha   30.77
_cell_angle_beta   30.77
_cell_angle_gamma   30.77
_symmetry_Int_Tables_number   1
_chemical_formula_structural   CoC2
_chemical_formula_sum   'Co1 C2'
_cell_volume   24.15
_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
  Co  Co2  1  0.0  0.0  0.0  1.0
  C  C0  1  0.0  0.0  0.15  1.0
  C  C1  1  0.0  0.0  0.28  1.0

data_CoC2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.32
_cell_length_b   2.5
_cell_length_c   4.7
_cell_angle_alpha   90.0
_cell_angle_beta   107.84
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   CoC2
_chemical_formula_sum   'Co2 C4'
_cell_volume   48.31
_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
  Co  Co0  2  0.0  0.0  0.0  1.0
  C  C1  2  -0.0  0.0  0.85  1.0
  C  C2  2  0.0  0.0  0.72  1.0

Co C C
CoC2 crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two CoC2 clusters. Co(1) is bonded in a single-bond geometry to one C(1) atom. The Co(1)-C(1) bond length is 0.71 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded in a distorted linear geometry to one Co(1) and one C(2) atom. The C(1)-C(2) bond length is 0.60 Å. In the second C site, C(2) is bonded in a single-bond geometry to one C(1) atom.