data_KNiGe2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.33
_cell_length_b   3.33
_cell_length_c   7.64
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   KNiGe2
_chemical_formula_sum   'K1 Ni1 Ge2'
_cell_volume   84.76
_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
  K  K2  1  0.0  0.0  0.92  1.0
  Ni  Ni3  1  0.67  0.67  0.61  1.0
  Ge  Ge0  1  0.0  0.0  0.21  1.0
  Ge  Ge1  1  0.67  0.67  0.35  1.0

data_KNiGe2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.71
_cell_length_b   4.71
_cell_length_c   7.64
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   KNiGe2
_chemical_formula_sum   'K2 Ni2 Ge4'
_cell_volume   169.52
_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
  K  K0  2  0.0  0.0  0.92  1.0
  Ni  Ni1  2  0.17  0.5  0.61  1.0
  Ge  Ge2  2  0.0  0.0  0.21  1.0
  Ge  Ge3  2  0.17  0.5  0.35  1.0

K Ni Ge Ge
KNiGe2 crystallizes in the monoclinic Cm space group. K(1) is bonded in a 2-coordinate geometry to one Ni(1) and one Ge(1) atom. The K(1)-Ni(1) bond length is 2.88 Å. The K(1)-Ge(1) bond length is 2.22 Å. Ni(1) is bonded in a distorted bent 150 degrees geometry to one K(1) and one Ge(2) atom. The Ni(1)-Ge(2) bond length is 1.95 Å. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a distorted single-bond geometry to one K(1) and three equivalent Ge(2) atoms. There is one shorter (1.90 Å) and two longer (2.70 Å) Ge(1)-Ge(2) bond lengths. In the second Ge site, Ge(2) is bonded in a 4-coordinate geometry to one Ni(1) and three equivalent Ge(1) atoms.