data_ZnC3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.38
_cell_length_b   9.38
_cell_length_c   9.38
_cell_angle_alpha   163.75
_cell_angle_beta   163.75
_cell_angle_gamma   23.05
_symmetry_Int_Tables_number   1
_chemical_formula_structural   ZnC3
_chemical_formula_sum   'Zn2 C6'
_cell_volume   64.61
_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
  Zn  Zn6  1  0.0  0.0  0.91  1.0
  Zn  Zn7  1  0.0  0.0  0.47  1.0
  C  C0  1  0.0  0.33  0.0  1.0
  C  C1  1  0.33  0.0  0.0  1.0
  C  C2  1  0.33  0.0  0.6  1.0
  C  C3  1  0.0  0.33  0.6  1.0
  C  C4  1  0.0  0.0  0.14  1.0
  C  C5  1  0.0  0.0  0.24  1.0

data_ZnC3
_symmetry_space_group_name_H-M   Cm
_cell_length_a   3.75
_cell_length_b   3.75
_cell_length_c   9.38
_cell_angle_alpha   90.0
_cell_angle_beta   101.53
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   ZnC3
_chemical_formula_sum   'Zn4 C12'
_cell_volume   129.22
_cell_formula_units_Z   4
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
  Zn  Zn0  2  0.41  0.5  0.91  1.0
  Zn  Zn1  2  0.47  0.0  0.47  1.0
  C  C2  4  0.34  0.66  0.67  1.0
  C  C3  4  0.43  0.16  0.27  1.0
  C  C4  2  0.14  0.0  0.14  1.0
  C  C5  2  0.24  0.0  0.24  1.0

Zn Zn C C C C C C
Zn Zn C C C C C C 0 2 o o + 0 0 + o + 0 0 o + + 0 3 o o + 0 6 o o + 1 5 o o o 1 2 o o + 1 2 o - o 1 3 - o o 1 3 o o + 1 7 o o o 1 4 o o o 2 3 o o o 4 7 o o o 5 7 o o o 6 7 o o o 
ZnC3 crystallizes in the monoclinic Cm space group. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a 3-coordinate geometry to one C(3) and two equivalent C(1) atoms. The Zn(1)-C(3) bond length is 2.17 Å. Both Zn(1)-C(1) bond lengths are 2.28 Å. In the second Zn site, Zn(2) is bonded in a 6-coordinate geometry to two equivalent C(2) and four equivalent C(1) atoms. Both Zn(2)-C(2) bond lengths are 1.96 Å. There are two shorter (2.20 Å) and two longer (2.42 Å) Zn(2)-C(1) bond lengths. There are four inequivalent C sites. In the first C site, C(1) is bonded in a 6-coordinate geometry to one Zn(1), two equivalent Zn(2), and three equivalent C(1) atoms. There is one shorter (1.22 Å) and two longer (1.99 Å) C(1)-C(1) bond lengths. In the second C site, C(2) is bonded in a 1-coordinate geometry to one Zn(2) and one C(4) atom. The C(2)-C(4) bond length is 0.95 Å. In the third C site, C(3) is bonded in a distorted linear geometry to one Zn(1) and one C(4) atom. The C(3)-C(4) bond length is 0.90 Å. In the fourth C site, C(4) is bonded in a distorted trigonal non-coplanar geometry to one C(3) and two equivalent C(2) atoms.