data_Ge2C
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.96
_cell_length_b   2.96
_cell_length_c   4.95
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ge2C
_chemical_formula_sum   'Ge2 C1'
_cell_volume   43.46
_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
  Ge  Ge1  1  0.0  0.0  0.47  1.0
  Ge  Ge2  1  0.48  0.48  0.0  1.0
  C  C0  1  0.0  0.0  0.0  1.0

data_Ge2C
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.19
_cell_length_b   4.19
_cell_length_c   4.95
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Ge2C
_chemical_formula_sum   'Ge4 C2'
_cell_volume   86.93
_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
  Ge  Ge0  2  0.0  0.0  0.47  1.0
  Ge  Ge1  2  0.48  0.0  0.0  1.0
  C  C2  2  0.0  0.0  0.0  1.0

Ge Ge C
Ge Ge C 0 1 - - o 0 1 - o o 0 1 o - o 0 1 o o o 0 1 o o + 0 0 + o o 0 0 o + o 0 2 o o o 0 2 o o + 1 2 o o o 1 2 o + o 1 2 + o o 1 2 + + o 
CGe(Ge) crystallizes in the monoclinic Cm space group. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 2-coordinate geometry to two equivalent C(1) atoms. There is one shorter (2.34 Å) and one longer (2.61 Å) Ge(1)-C(1) bond length. In the second Ge site, Ge(2) is bonded in a square co-planar geometry to four equivalent C(1) atoms. There are a spread of Ge(2)-C(1) bond distances ranging from 2.02-2.17 Å. C(1) is bonded to two equivalent Ge(1) and four equivalent Ge(2) atoms to form a mixture of distorted edge and corner-sharing CGe6 octahedra. The corner-sharing octahedral tilt angles range from 0-4°.