The structure described by Er4CdS7 crystallizes in the monoclinic Cm space group. There are four inequivalent Er sites. In the first Er site, Er(1) is bonded in a 7-coordinate geometry to one S(4), two equivalent S(2), two equivalent S(3), and two equivalent S(5) atoms. In the second Er site, Er(2) is bonded in a 7-coordinate geometry to one S(3), two equivalent S(1), two equivalent S(4), and two equivalent S(6) atoms. In the third Er site, Er(3) is bonded to one S(5), one S(6), two equivalent S(3), and two equivalent S(4) atoms to form ErS6 octahedra that share  a cornercorner with one Er(4)S6 octahedra,  a cornercorner with one Cd(1)S6 octahedra, and edges with two equivalent Er(3)S6 octahedra. The corner-sharing octahedral tilt angles range from 54-56°. In the fourth Er site, Er(4) is bonded to one S(2), one S(6), two equivalent S(1), and two equivalent S(7) atoms to form ErS6 octahedra that share  a cornercorner with one Er(3)S6 octahedra, corners with two equivalent Cd(1)S6 octahedra, edges with two equivalent Er(4)S6 octahedra, and edges with three equivalent Cd(1)S6 octahedra. The corner-sharing octahedral tilt angles range from 3-54°. Cd(1) is bonded to one S(1), one S(5), two equivalent S(2), and two equivalent S(7) atoms to form CdS6 octahedra that share  a cornercorner with one Er(3)S6 octahedra, corners with two equivalent Er(4)S6 octahedra, edges with two equivalent Cd(1)S6 octahedra, and edges with three equivalent Er(4)S6 octahedra. The corner-sharing octahedral tilt angles range from 3-56°. There are seven inequivalent S sites. In the first S site, S(1) is bonded to two equivalent Er(2), two equivalent Er(4), and one Cd(1) atom to form SEr4Cd trigonal bipyramids that share  a cornercorner with one S(5)Er3Cd tetrahedra, corners with four equivalent S(6)Er4 tetrahedra, corners with two equivalent S(3)Er5 trigonal bipyramids, corners with two equivalent S(4)Er5 trigonal bipyramids,  an edgeedge with one S(6)Er4 tetrahedra,  an edgeedge with one S(4)Er5 trigonal bipyramid, edges with two equivalent S(2)Er3Cd2 trigonal bipyramids, and edges with two equivalent S(1)Er4Cd trigonal bipyramids. In the second S site, S(2) is bonded to one Er(4), two equivalent Er(1), and two equivalent Cd(1) atoms to form SEr3Cd2 trigonal bipyramids that share  a cornercorner with one S(6)Er4 tetrahedra, corners with four equivalent S(5)Er3Cd tetrahedra, corners with two equivalent S(3)Er5 trigonal bipyramids, corners with two equivalent S(4)Er5 trigonal bipyramids,  an edgeedge with one S(5)Er3Cd tetrahedra,  an edgeedge with one S(3)Er5 trigonal bipyramid, edges with two equivalent S(2)Er3Cd2 trigonal bipyramids, and edges with two equivalent S(1)Er4Cd trigonal bipyramids. In the third S site, S(3) is bonded to one Er(2), two equivalent Er(1), and two equivalent Er(3) atoms to form distorted SEr5 trigonal bipyramids that share corners with four equivalent S(5)Er3Cd tetrahedra, corners with two equivalent S(2)Er3Cd2 trigonal bipyramids, corners with two equivalent S(1)Er4Cd trigonal bipyramids, corners with two equivalent S(4)Er5 trigonal bipyramids,  an edgeedge with one S(5)Er3Cd tetrahedra, edges with two equivalent S(6)Er4 tetrahedra,  an edgeedge with one S(2)Er3Cd2 trigonal bipyramid, edges with two equivalent S(3)Er5 trigonal bipyramids, and edges with three equivalent S(4)Er5 trigonal bipyramids. In the fourth S site, S(4) is bonded to one Er(1), two equivalent Er(2), and two equivalent Er(3) atoms to form distorted SEr5 trigonal bipyramids that share corners with four equivalent S(6)Er4 tetrahedra, corners with two equivalent S(2)Er3Cd2 trigonal bipyramids, corners with two equivalent S(1)Er4Cd trigonal bipyramids, corners with two equivalent S(3)Er5 trigonal bipyramids,  an edgeedge with one S(6)Er4 tetrahedra, edges with two equivalent S(5)Er3Cd tetrahedra,  an edgeedge with one S(1)Er4Cd trigonal bipyramid, edges with two equivalent S(4)Er5 trigonal bipyramids, and edges with three equivalent S(3)Er5 trigonal bipyramids. In the fifth S site, S(5) is bonded to one Er(3), two equivalent Er(1), and one Cd(1) atom to form SEr3Cd tetrahedra that share  a cornercorner with one S(6)Er4 tetrahedra, corners with two equivalent S(5)Er3Cd tetrahedra,  a cornercorner with one S(1)Er4Cd trigonal bipyramid, corners with four equivalent S(2)Er3Cd2 trigonal bipyramids, corners with four equivalent S(3)Er5 trigonal bipyramids,  an edgeedge with one S(2)Er3Cd2 trigonal bipyramid,  an edgeedge with one S(3)Er5 trigonal bipyramid, and edges with two equivalent S(4)Er5 trigonal bipyramids. In the sixth S site, S(6) is bonded to one Er(3), one Er(4), and two equivalent Er(2) atoms to form SEr4 tetrahedra that share  a cornercorner with one S(5)Er3Cd tetrahedra, corners with two equivalent S(6)Er4 tetrahedra,  a cornercorner with one S(2)Er3Cd2 trigonal bipyramid, corners with four equivalent S(1)Er4Cd trigonal bipyramids, corners with four equivalent S(4)Er5 trigonal bipyramids,  an edgeedge with one S(1)Er4Cd trigonal bipyramid,  an edgeedge with one S(4)Er5 trigonal bipyramid, and edges with two equivalent S(3)Er5 trigonal bipyramids. In the seventh S site, S(7) is bonded in a square co-planar geometry to two equivalent Er(4) and two equivalent Cd(1) atoms. is represented by the CIF file [CIF]
data_Er4CdS7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.598
_cell_length_b   6.598
_cell_length_c   11.531
_cell_angle_alpha   75.753
_cell_angle_beta   75.753
_cell_angle_gamma   33.510
_symmetry_Int_Tables_number   1
_cell_volume   267.852
_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
  Er  Er0  1  0.693  0.693  0.199  1.0
  Er  Er1  1  0.307  0.307  0.804  1.0
  Er  Er2  1  0.000  0.000  0.002  1.0
  Er  Er3  1  0.115  0.115  0.572  1.0
  Cd  Cd4  1  0.885  0.885  0.421  1.0
  S  S5  1  0.741  0.741  0.648  1.0
  S  S6  1  0.257  0.257  0.352  1.0
  S  S7  1  0.341  0.341  0.050  1.0
  S  S8  1  0.660  0.660  0.948  1.0
  S  S9  1  0.039  0.039  0.216  1.0
  S  S10  1  0.961  0.961  0.785  1.0
  S  S11  1  0.501  0.501  0.502  1.0
[/CIF]
.
The structure described by Er4CdS7 crystallizes in the monoclinic Cm space group. There are four inequivalent Er sites. In the first Er site, Er(1) is bonded in a 7-coordinate geometry to one S(4), two equivalent S(2), two equivalent S(3), and two equivalent S(5) atoms. In the second Er site, Er(2) is bonded in a 7-coordinate geometry to one S(3), two equivalent S(1), two equivalent S(4), and two equivalent S(6) atoms. In the third Er site, Er(3) is bonded to one S(5), one S(6), two equivalent S(3), and two equivalent S(4) atoms to form ErS6 octahedra that share  a cornercorner with one Er(4)S6 octahedra,  a cornercorner with one Cd(1)S6 octahedra, and edges with two equivalent Er(3)S6 octahedra. The corner-sharing octahedral tilt angles range from 54-56°. In the fourth Er site, Er(4) is bonded to one S(2), one S(6), two equivalent S(1), and two equivalent S(7) atoms to form ErS6 octahedra that share  a cornercorner with one Er(3)S6 octahedra, corners with two equivalent Cd(1)S6 octahedra, edges with two equivalent Er(4)S6 octahedra, and edges with three equivalent Cd(1)S6 octahedra. The corner-sharing octahedral tilt angles range from 3-54°. Cd(1) is bonded to one S(1), one S(5), two equivalent S(2), and two equivalent S(7) atoms to form CdS6 octahedra that share  a cornercorner with one Er(3)S6 octahedra, corners with two equivalent Er(4)S6 octahedra, edges with two equivalent Cd(1)S6 octahedra, and edges with three equivalent Er(4)S6 octahedra. The corner-sharing octahedral tilt angles range from 3-56°. There are seven inequivalent S sites. In the first S site, S(1) is bonded to two equivalent Er(2), two equivalent Er(4), and one Cd(1) atom to form SEr4Cd trigonal bipyramids that share  a cornercorner with one S(5)Er3Cd tetrahedra, corners with four equivalent S(6)Er4 tetrahedra, corners with two equivalent S(3)Er5 trigonal bipyramids, corners with two equivalent S(4)Er5 trigonal bipyramids,  an edgeedge with one S(6)Er4 tetrahedra,  an edgeedge with one S(4)Er5 trigonal bipyramid, edges with two equivalent S(2)Er3Cd2 trigonal bipyramids, and edges with two equivalent S(1)Er4Cd trigonal bipyramids. In the second S site, S(2) is bonded to one Er(4), two equivalent Er(1), and two equivalent Cd(1) atoms to form SEr3Cd2 trigonal bipyramids that share  a cornercorner with one S(6)Er4 tetrahedra, corners with four equivalent S(5)Er3Cd tetrahedra, corners with two equivalent S(3)Er5 trigonal bipyramids, corners with two equivalent S(4)Er5 trigonal bipyramids,  an edgeedge with one S(5)Er3Cd tetrahedra,  an edgeedge with one S(3)Er5 trigonal bipyramid, edges with two equivalent S(2)Er3Cd2 trigonal bipyramids, and edges with two equivalent S(1)Er4Cd trigonal bipyramids. In the third S site, S(3) is bonded to one Er(2), two equivalent Er(1), and two equivalent Er(3) atoms to form distorted SEr5 trigonal bipyramids that share corners with four equivalent S(5)Er3Cd tetrahedra, corners with two equivalent S(2)Er3Cd2 trigonal bipyramids, corners with two equivalent S(1)Er4Cd trigonal bipyramids, corners with two equivalent S(4)Er5 trigonal bipyramids,  an edgeedge with one S(5)Er3Cd tetrahedra, edges with two equivalent S(6)Er4 tetrahedra,  an edgeedge with one S(2)Er3Cd2 trigonal bipyramid, edges with two equivalent S(3)Er5 trigonal bipyramids, and edges with three equivalent S(4)Er5 trigonal bipyramids. In the fourth S site, S(4) is bonded to one Er(1), two equivalent Er(2), and two equivalent Er(3) atoms to form distorted SEr5 trigonal bipyramids that share corners with four equivalent S(6)Er4 tetrahedra, corners with two equivalent S(2)Er3Cd2 trigonal bipyramids, corners with two equivalent S(1)Er4Cd trigonal bipyramids, corners with two equivalent S(3)Er5 trigonal bipyramids,  an edgeedge with one S(6)Er4 tetrahedra, edges with two equivalent S(5)Er3Cd tetrahedra,  an edgeedge with one S(1)Er4Cd trigonal bipyramid, edges with two equivalent S(4)Er5 trigonal bipyramids, and edges with three equivalent S(3)Er5 trigonal bipyramids. In the fifth S site, S(5) is bonded to one Er(3), two equivalent Er(1), and one Cd(1) atom to form SEr3Cd tetrahedra that share  a cornercorner with one S(6)Er4 tetrahedra, corners with two equivalent S(5)Er3Cd tetrahedra,  a cornercorner with one S(1)Er4Cd trigonal bipyramid, corners with four equivalent S(2)Er3Cd2 trigonal bipyramids, corners with four equivalent S(3)Er5 trigonal bipyramids,  an edgeedge with one S(2)Er3Cd2 trigonal bipyramid,  an edgeedge with one S(3)Er5 trigonal bipyramid, and edges with two equivalent S(4)Er5 trigonal bipyramids. In the sixth S site, S(6) is bonded to one Er(3), one Er(4), and two equivalent Er(2) atoms to form SEr4 tetrahedra that share  a cornercorner with one S(5)Er3Cd tetrahedra, corners with two equivalent S(6)Er4 tetrahedra,  a cornercorner with one S(2)Er3Cd2 trigonal bipyramid, corners with four equivalent S(1)Er4Cd trigonal bipyramids, corners with four equivalent S(4)Er5 trigonal bipyramids,  an edgeedge with one S(1)Er4Cd trigonal bipyramid,  an edgeedge with one S(4)Er5 trigonal bipyramid, and edges with two equivalent S(3)Er5 trigonal bipyramids. In the seventh S site, S(7) is bonded in a square co-planar geometry to two equivalent Er(4) and two equivalent Cd(1) atoms. is represented by the CIF file [CIF]
data_Er4CdS7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.598
_cell_length_b   6.598
_cell_length_c   11.531
_cell_angle_alpha   75.753
_cell_angle_beta   75.753
_cell_angle_gamma   33.510
_symmetry_Int_Tables_number   1
_cell_volume   267.852
_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
  Er  Er0  1  0.693  0.693  0.199  1.0
  Er  Er1  1  0.307  0.307  0.804  1.0
  Er  Er2  1  0.000  0.000  0.002  1.0
  Er  Er3  1  0.115  0.115  0.572  1.0
  Cd  Cd4  1  0.885  0.885  0.421  1.0
  S  S5  1  0.741  0.741  0.648  1.0
  S  S6  1  0.257  0.257  0.352  1.0
  S  S7  1  0.341  0.341  0.050  1.0
  S  S8  1  0.660  0.660  0.948  1.0
  S  S9  1  0.039  0.039  0.216  1.0
  S  S10  1  0.961  0.961  0.785  1.0
  S  S11  1  0.501  0.501  0.502  1.0
[/CIF]
.