data_Ca2C
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.07
_cell_length_b   7.07
_cell_length_c   7.07
_cell_angle_alpha   29.93
_cell_angle_beta   29.93
_cell_angle_gamma   29.93
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ca2C
_chemical_formula_sum   'Ca2 C1'
_cell_volume   78.05
_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
  Ca  Ca1  1  0.0  0.0  0.3  1.0
  Ca  Ca2  1  0.0  0.0  0.21  1.0
  C  C0  1  0.0  0.0  0.0  1.0

data_Ca2C
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.33
_cell_length_b   3.65
_cell_length_c   7.07
_cell_angle_alpha   90.0
_cell_angle_beta   107.35
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Ca2C
_chemical_formula_sum   'Ca4 C2'
_cell_volume   156.11
_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
  Ca  Ca0  2  -0.0  0.0  0.7  1.0
  Ca  Ca1  2  -0.0  0.0  0.79  1.0
  C  C2  2  0.0  0.0  1.0  1.0

Ca Ca C
Ca2C is Cyanogen Chloride-derived structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two Ca2C clusters. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a single-bond geometry to one Ca(2) atom. The Ca(1)-Ca(2) bond length is 0.62 Å. In the second Ca site, Ca(2) is bonded in a linear geometry to one Ca(1) and one C(1) atom. The Ca(2)-C(1) bond length is 1.46 Å. C(1) is bonded in a single-bond geometry to one Ca(2) atom.