data_FeC
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.22
_cell_length_b   3.22
_cell_length_c   3.98
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   FeC
_chemical_formula_sum   'Fe2 C2'
_cell_volume   35.83
_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
  Fe  Fe2  1  0.0  0.86  0.98  1.0
  Fe  Fe3  1  0.61  0.93  0.99  1.0
  C  C0  1  0.0  0.86  0.99  1.0
  C  C1  1  0.61  0.93  0.98  1.0

data_FeC
_symmetry_space_group_name_H-M   P2/m
_cell_length_a   3.22
_cell_length_b   3.98
_cell_length_c   3.22
_cell_angle_alpha   90.0
_cell_angle_beta   120.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   10
_chemical_formula_structural   FeC
_chemical_formula_sum   'Fe2 C2'
_cell_volume   35.83
_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, y, -z'
  4  '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
  Fe  Fe0  2  0.31  0.0  0.53  1.0
  C  C1  2  0.31  0.0  0.53  1.0

Fe Fe C C
FeC is alpha carbon monoxide-like structured and crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of two iron--methane (1/1) molecules. Fe(1) is bonded in a single-bond geometry to one C(1) atom. The Fe(1)-C(1) bond length is 0.04 Å. C(1) is bonded in a single-bond geometry to one Fe(1) atom.