data_SrAl2Cr
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.14
_cell_length_b   5.14
_cell_length_c   5.14
_cell_angle_alpha   129.31
_cell_angle_beta   129.31
_cell_angle_gamma   74.51
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SrAl2Cr
_chemical_formula_sum   'Sr1 Al2 Cr1'
_cell_volume   79.34
_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
  Sr  Sr3  1  0.0  0.0  0.09  1.0
  Al  Al0  1  0.0  0.2  0.05  1.0
  Al  Al1  1  0.2  0.0  0.05  1.0
  Cr  Cr2  1  0.0  0.0  0.0  1.0

data_SrAl2Cr
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.23
_cell_length_b   6.23
_cell_length_c   5.14
_cell_angle_alpha   90.0
_cell_angle_beta   127.26
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   SrAl2Cr
_chemical_formula_sum   'Sr2 Al4 Cr2'
_cell_volume   158.67
_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
  Sr  Sr0  2  0.41  0.5  0.91  1.0
  Al  Al1  4  0.05  0.1  0.15  1.0
  Cr  Cr2  2  0.0  0.0  0.0  1.0

Sr Al Al Cr
SrCrAl2 is Copper structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two SrCrAl2 clusters. Sr(1) is bonded in a single-bond geometry to one Cr(1) atom. The Sr(1)-Cr(1) bond length is 0.48 Å. Cr(1) is bonded in a distorted single-bond geometry to one Sr(1) and two equivalent Al(1) atoms. Both Cr(1)-Al(1) bond lengths are 0.90 Å. Al(1) is bonded in a single-bond geometry to one Cr(1) atom.