data_ReRu3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.7
_cell_length_b   4.7
_cell_length_c   4.7
_cell_angle_alpha   131.77
_cell_angle_beta   131.77
_cell_angle_gamma   70.59
_symmetry_Int_Tables_number   1
_chemical_formula_structural   ReRu3
_chemical_formula_sum   'Re1 Ru3'
_cell_volume   56.68
_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
  Re  Re0  1  0.0  0.0  0.84  1.0
  Ru  Ru1  1  0.0  0.92  0.92  1.0
  Ru  Ru2  1  0.0  0.0  0.0  1.0
  Ru  Ru3  1  0.92  0.0  0.92  1.0

data_ReRu3
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.43
_cell_length_b   5.43
_cell_length_c   4.7
_cell_angle_alpha   90.0
_cell_angle_beta   125.3
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   ReRu3
_chemical_formula_sum   'Re2 Ru6'
_cell_volume   113.35
_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
  Re  Re0  2  0.16  0.0  0.16  1.0
  Ru  Ru1  4  0.04  0.04  0.0  1.0
  Ru  Ru2  2  0.0  0.0  0.0  1.0

Re Ru Ru Ru
Re Ru Ru Ru 0 3 - o o 0 1 o - o 0 2 o o + 1 2 o + + 2 3 - o - 
ReRu3 crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two ReRu3 clusters. Re(1) is bonded in a 2-coordinate geometry to two equivalent Ru(1) atoms. Both Re(1)-Ru(1) bond lengths are 0.68 Å. There are two inequivalent Ru sites. In the first Ru site, Ru(1) is bonded in a distorted L-shaped geometry to one Re(1) and one Ru(2) atom. The Ru(1)-Ru(2) bond length is 0.31 Å. In the second Ru site, Ru(2) is bonded in an L-shaped geometry to two equivalent Ru(1) atoms.