data_Al3Ru
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.77
_cell_length_b   4.77
_cell_length_c   4.77
_cell_angle_alpha   132.5
_cell_angle_beta   132.5
_cell_angle_gamma   69.44
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Al3Ru
_chemical_formula_sum   'Al3 Ru1'
_cell_volume   57.89
_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
  Al  Al0  1  0.92  0.0  0.96  1.0
  Al  Al1  1  0.0  0.0  0.0  1.0
  Al  Al2  1  0.0  0.92  0.96  1.0
  Ru  Ru3  1  0.0  0.0  0.92  1.0

data_Al3Ru
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.43
_cell_length_b   5.43
_cell_length_c   4.77
_cell_angle_alpha   90.0
_cell_angle_beta   124.72
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Al3Ru
_chemical_formula_sum   'Al6 Ru2'
_cell_volume   115.79
_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
  Al  Al0  4  0.04  0.04  0.04  1.0
  Al  Al1  2  0.0  0.0  0.0  1.0
  Ru  Ru2  2  0.0  0.0  0.92  1.0

Al Al Al Ru
Al3Ru is Indium-like structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two Al3Ru clusters. Ru(1) is bonded in a single-bond geometry to one Al(2) atom. The Ru(1)-Al(2) bond length is 0.38 Å. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a distorted single-bond geometry to one Al(2) atom. The Al(1)-Al(2) bond length is 0.28 Å. In the second Al site, Al(2) is bonded in a distorted trigonal non-coplanar geometry to one Ru(1) and two equivalent Al(1) atoms.