The structure described by KEr2Cl7 crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 9-coordinate geometry to one Cl(3), one Cl(4), one Cl(5), one Cl(6), one Cl(7), two equivalent Cl(1), and two equivalent Cl(2) atoms. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded to one Cl(1), one Cl(2), one Cl(3), one Cl(4), one Cl(5), one Cl(6), and one Cl(7) atom to form a mixture of distorted face and edge-sharing ErCl7 pentagonal bipyramids. In the second Er site, Er(2) is bonded to one Cl(1), one Cl(2), one Cl(3), one Cl(4), one Cl(5), one Cl(6), and one Cl(7) atom to form a mixture of distorted face and edge-sharing ErCl7 pentagonal bipyramids. There are seven inequivalent Cl sites. In the first Cl site, Cl(6) is bonded in a distorted T-shaped geometry to one K(1), one Er(1), and one Er(2) atom. In the second Cl site, Cl(7) is bonded in a trigonal non-coplanar geometry to one K(1), one Er(1), and one Er(2) atom. In the third Cl site, Cl(1) is bonded in a 4-coordinate geometry to two equivalent K(1), one Er(1), and one Er(2) atom. In the fourth Cl site, Cl(2) is bonded in a 4-coordinate geometry to two equivalent K(1), one Er(1), and one Er(2) atom. In the fifth Cl site, Cl(3) is bonded in a distorted L-shaped geometry to one K(1), one Er(1), and one Er(2) atom. In the sixth Cl site, Cl(4) is bonded in a distorted trigonal non-coplanar geometry to one K(1), one Er(1), and one Er(2) atom. In the seventh Cl site, Cl(5) is bonded in a trigonal non-coplanar geometry to one K(1), one Er(1), and one Er(2) atom. is represented by the CIF file [CIF]
data_KEr2Cl7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.476
_cell_length_b   6.843
_cell_length_c   12.815
_cell_angle_alpha   89.584
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1094.031
_cell_formula_units_Z   4
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  K0  1  0.203  0.776  0.037  1.0
  K  K1  1  0.797  0.224  0.963  1.0
  K  K2  1  0.703  0.224  0.463  1.0
  K  K3  1  0.297  0.776  0.537  1.0
  Er  Er4  1  0.538  0.772  0.238  1.0
  Er  Er5  1  0.462  0.228  0.762  1.0
  Er  Er6  1  0.038  0.228  0.262  1.0
  Er  Er7  1  0.962  0.772  0.738  1.0
  Er  Er8  1  0.840  0.727  0.248  1.0
  Er  Er9  1  0.160  0.273  0.752  1.0
  Er  Er10  1  0.340  0.273  0.252  1.0
  Er  Er11  1  0.660  0.727  0.748  1.0
  Cl  Cl12  1  0.972  0.949  0.131  1.0
  Cl  Cl13  1  0.028  0.051  0.869  1.0
  Cl  Cl14  1  0.472  0.051  0.369  1.0
  Cl  Cl15  1  0.528  0.949  0.631  1.0
  Cl  Cl16  1  0.686  0.747  0.396  1.0
  Cl  Cl17  1  0.314  0.253  0.604  1.0
  Cl  Cl18  1  0.186  0.253  0.104  1.0
  Cl  Cl19  1  0.814  0.747  0.896  1.0
  Cl  Cl20  1  0.679  0.510  0.174  1.0
  Cl  Cl21  1  0.321  0.490  0.826  1.0
  Cl  Cl22  1  0.179  0.490  0.326  1.0
  Cl  Cl23  1  0.821  0.510  0.674  1.0
  Cl  Cl24  1  0.926  0.980  0.381  1.0
  Cl  Cl25  1  0.074  0.020  0.619  1.0
  Cl  Cl26  1  0.426  0.020  0.119  1.0
  Cl  Cl27  1  0.574  0.980  0.881  1.0
  Cl  Cl28  1  0.943  0.468  0.127  1.0
  Cl  Cl29  1  0.057  0.532  0.873  1.0
  Cl  Cl30  1  0.443  0.532  0.373  1.0
  Cl  Cl31  1  0.557  0.468  0.627  1.0
  Cl  Cl32  1  0.702  0.995  0.174  1.0
  Cl  Cl33  1  0.298  0.005  0.826  1.0
  Cl  Cl34  1  0.202  0.005  0.326  1.0
  Cl  Cl35  1  0.798  0.995  0.674  1.0
  Cl  Cl36  1  0.912  0.459  0.381  1.0
  Cl  Cl37  1  0.088  0.541  0.619  1.0
  Cl  Cl38  1  0.412  0.541  0.119  1.0
  Cl  Cl39  1  0.588  0.459  0.881  1.0
[/CIF]
.
The structure described by KEr2Cl7 crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 9-coordinate geometry to one Cl(3), one Cl(4), one Cl(5), one Cl(6), one Cl(7), two equivalent Cl(1), and two equivalent Cl(2) atoms. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded to one Cl(1), one Cl(2), one Cl(3), one Cl(4), one Cl(5), one Cl(6), and one Cl(7) atom to form a mixture of distorted face and edge-sharing ErCl7 pentagonal bipyramids. In the second Er site, Er(2) is bonded to one Cl(1), one Cl(2), one Cl(3), one Cl(4), one Cl(5), one Cl(6), and one Cl(7) atom to form a mixture of distorted face and edge-sharing ErCl7 pentagonal bipyramids. There are seven inequivalent Cl sites. In the first Cl site, Cl(6) is bonded in a distorted T-shaped geometry to one K(1), one Er(1), and one Er(2) atom. In the second Cl site, Cl(7) is bonded in a trigonal non-coplanar geometry to one K(1), one Er(1), and one Er(2) atom. In the third Cl site, Cl(1) is bonded in a 4-coordinate geometry to two equivalent K(1), one Er(1), and one Er(2) atom. In the fourth Cl site, Cl(2) is bonded in a 4-coordinate geometry to two equivalent K(1), one Er(1), and one Er(2) atom. In the fifth Cl site, Cl(3) is bonded in a distorted L-shaped geometry to one K(1), one Er(1), and one Er(2) atom. In the sixth Cl site, Cl(4) is bonded in a distorted trigonal non-coplanar geometry to one K(1), one Er(1), and one Er(2) atom. In the seventh Cl site, Cl(5) is bonded in a trigonal non-coplanar geometry to one K(1), one Er(1), and one Er(2) atom. is represented by the CIF file [CIF]
data_KEr2Cl7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.476
_cell_length_b   6.843
_cell_length_c   12.815
_cell_angle_alpha   89.584
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1094.031
_cell_formula_units_Z   4
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  K0  1  0.203  0.776  0.037  1.0
  K  K1  1  0.797  0.224  0.963  1.0
  K  K2  1  0.703  0.224  0.463  1.0
  K  K3  1  0.297  0.776  0.537  1.0
  Er  Er4  1  0.538  0.772  0.238  1.0
  Er  Er5  1  0.462  0.228  0.762  1.0
  Er  Er6  1  0.038  0.228  0.262  1.0
  Er  Er7  1  0.962  0.772  0.738  1.0
  Er  Er8  1  0.840  0.727  0.248  1.0
  Er  Er9  1  0.160  0.273  0.752  1.0
  Er  Er10  1  0.340  0.273  0.252  1.0
  Er  Er11  1  0.660  0.727  0.748  1.0
  Cl  Cl12  1  0.972  0.949  0.131  1.0
  Cl  Cl13  1  0.028  0.051  0.869  1.0
  Cl  Cl14  1  0.472  0.051  0.369  1.0
  Cl  Cl15  1  0.528  0.949  0.631  1.0
  Cl  Cl16  1  0.686  0.747  0.396  1.0
  Cl  Cl17  1  0.314  0.253  0.604  1.0
  Cl  Cl18  1  0.186  0.253  0.104  1.0
  Cl  Cl19  1  0.814  0.747  0.896  1.0
  Cl  Cl20  1  0.679  0.510  0.174  1.0
  Cl  Cl21  1  0.321  0.490  0.826  1.0
  Cl  Cl22  1  0.179  0.490  0.326  1.0
  Cl  Cl23  1  0.821  0.510  0.674  1.0
  Cl  Cl24  1  0.926  0.980  0.381  1.0
  Cl  Cl25  1  0.074  0.020  0.619  1.0
  Cl  Cl26  1  0.426  0.020  0.119  1.0
  Cl  Cl27  1  0.574  0.980  0.881  1.0
  Cl  Cl28  1  0.943  0.468  0.127  1.0
  Cl  Cl29  1  0.057  0.532  0.873  1.0
  Cl  Cl30  1  0.443  0.532  0.373  1.0
  Cl  Cl31  1  0.557  0.468  0.627  1.0
  Cl  Cl32  1  0.702  0.995  0.174  1.0
  Cl  Cl33  1  0.298  0.005  0.826  1.0
  Cl  Cl34  1  0.202  0.005  0.326  1.0
  Cl  Cl35  1  0.798  0.995  0.674  1.0
  Cl  Cl36  1  0.912  0.459  0.381  1.0
  Cl  Cl37  1  0.088  0.541  0.619  1.0
  Cl  Cl38  1  0.412  0.541  0.119  1.0
  Cl  Cl39  1  0.588  0.459  0.881  1.0
[/CIF]
.