data_K2CrGe
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.76
_cell_length_b   4.76
_cell_length_c   5.61
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   K2CrGe
_chemical_formula_sum   'K2 Cr1 Ge1'
_cell_volume   127.12
_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  0.38  0.38  0.18  1.0
  K  K3  1  0.38  0.38  0.43  1.0
  Cr  Cr0  1  0.0  0.0  0.0  1.0
  Ge  Ge1  1  0.0  0.0  0.81  1.0

data_K2CrGe
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.73
_cell_length_b   6.73
_cell_length_c   5.61
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   K2CrGe
_chemical_formula_sum   'K4 Cr2 Ge2'
_cell_volume   254.24
_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  0.38  0.0  0.18  1.0
  K  K1  2  0.38  0.0  0.43  1.0
  Cr  Cr2  2  0.0  0.0  0.0  1.0
  Ge  Ge3  2  0.0  0.0  0.81  1.0

K K Cr Ge
K2CrGe crystallizes in the monoclinic Cm space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 4-coordinate geometry to one K(2) and three equivalent Cr(1) atoms. The K(1)-K(2) bond length is 1.40 Å. There is one shorter (2.75 Å) and two longer (3.61 Å) K(1)-Cr(1) bond lengths. In the second K site, K(2) is bonded in a bent 120 degrees geometry to one K(1) and one Ge(1) atom. The K(2)-Ge(1) bond length is 3.31 Å. Cr(1) is bonded in a distorted single-bond geometry to three equivalent K(1) and one Ge(1) atom. The Cr(1)-Ge(1) bond length is 1.08 Å. Ge(1) is bonded in a distorted single-bond geometry to one K(2) and one Cr(1) atom.