data_KAl
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.45
_cell_length_b   4.45
_cell_length_c   10.22
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   KAl
_chemical_formula_sum   'K2 Al2'
_cell_volume   175.03
_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
  K  K2  1  0.22  0.28  0.1  1.0
  K  K3  1  0.0  0.57  0.12  1.0
  Al  Al0  1  0.22  0.28  0.94  1.0
  Al  Al1  1  0.0  0.57  0.29  1.0

data_KAl
_symmetry_space_group_name_H-M   P-1
_cell_length_a   4.45
_cell_length_b   4.45
_cell_length_c   10.22
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   2
_chemical_formula_structural   KAl
_chemical_formula_sum   'K2 Al2'
_cell_volume   175.03
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-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
  K  K0  2  0.11  0.86  0.99  1.0
  Al  Al1  2  0.11  0.86  0.82  1.0

K K Al Al
K K Al Al 0 1 o o o 0 2 o o - 1 3 o o o 
AlK crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of two alumanylpotassium molecules. K(1) is bonded in a single-bond geometry to one Al(1) atom. The K(1)-Al(1) bond length is 1.70 Å. Al(1) is bonded in a single-bond geometry to one K(1) atom.