data_ReC
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.92
_cell_length_b   2.92
_cell_length_c   4.99
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   ReC
_chemical_formula_sum   'Re2 C2'
_cell_volume   42.69
_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
  Re  Re2  1  0.46  0.0  0.56  1.0
  Re  Re3  1  0.0  0.46  0.44  1.0
  C  C0  1  0.46  0.46  0.0  1.0
  C  C1  1  0.0  0.0  0.0  1.0

data_ReC
_symmetry_space_group_name_H-M   C2/m
_cell_length_a   4.14
_cell_length_b   4.14
_cell_length_c   4.99
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   12
_chemical_formula_structural   ReC
_chemical_formula_sum   'Re4 C4'
_cell_volume   85.38
_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, y, -z'
  4  'x, -y, z'
  5  'x+1/2, y+1/2, z'
  6  '-x+1/2, -y+1/2, -z'
  7  '-x+1/2, y+1/2, -z'
  8  '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
  Re  Re0  4  0.23  0.5  0.06  1.0
  C  C1  4  0.0  0.27  0.5  1.0

Re Re C C
ReC crystallizes in the monoclinic Cm space group. There are two inequivalent Re sites. In the first Re site, Re(1) is bonded in a 8-coordinate geometry to four equivalent Re(2) and four equivalent C(1) atoms. There are a spread of Re(1)-Re(2) bond distances ranging from 2.00-2.31 Å. There are two shorter (2.59 Å) and two longer (2.71 Å) Re(1)-C(1) bond lengths. In the second Re site, Re(2) is bonded in a 8-coordinate geometry to four equivalent Re(1) and four equivalent C(1) atoms. There are two shorter (2.56 Å) and two longer (2.69 Å) Re(2)-C(1) bond lengths. C(1) is bonded in a 7-coordinate geometry to two equivalent Re(1), two equivalent Re(2), and three equivalent C(1) atoms. There is one shorter (1.91 Å) and two longer (2.07 Å) C(1)-C(1) bond lengths.