The structure described by Ce4(ErS2)11 crystallizes in the monoclinic C2/m space group. There are six inequivalent Er sites. In the first Er site, Er(1) is bonded to one S(5), one S(9), two equivalent S(2), and two equivalent S(3) atoms to form a mixture of edge and corner-sharing ErS6 octahedra. The corner-sharing octahedral tilt angles range from 48-59°. In the second Er site, Er(2) is bonded to one S(10), one S(3), two equivalent S(1), and two equivalent S(9) atoms to form a mixture of edge and corner-sharing ErS6 octahedra. The corner-sharing octahedral tilt angles range from 48-59°. In the third Er site, Er(3) is bonded to one S(7), two equivalent S(8), and three equivalent S(11) atoms to form ErS6 octahedra that share corners with three equivalent Er(6)S6 octahedra,  a cornercorner with one Er(4)S7 pentagonal bipyramid, edges with four equivalent Er(3)S6 octahedra, and edges with two equivalent Er(4)S7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 50-63°. In the fourth Er site, Er(4) is bonded to one S(6), one S(8), two equivalent S(4), and three equivalent S(7) atoms to form distorted ErS7 pentagonal bipyramids that share  a cornercorner with one Er(3)S6 octahedra, corners with two equivalent Er(6)S6 octahedra, edges with two equivalent Er(3)S6 octahedra, and edges with four equivalent Er(4)S7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 39-49°. In the fifth Er site, Er(5) is bonded to two equivalent S(3) and four equivalent S(5) atoms to form a mixture of edge and corner-sharing ErS6 octahedra. The corner-sharing octahedral tilt angles are 55°. In the sixth Er site, Er(6) is bonded to one S(1), one S(11), two equivalent S(10), and two equivalent S(6) atoms to form ErS6 octahedra that share corners with three equivalent Er(3)S6 octahedra, corners with two equivalent Er(4)S7 pentagonal bipyramids, edges with two equivalent Er(2)S6 octahedra, and edges with two equivalent Er(6)S6 octahedra. The corner-sharing octahedral tilt angles range from 50-63°. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 8-coordinate geometry to one S(4), one S(9), two equivalent S(10), two equivalent S(2), and two equivalent S(8) atoms. In the second Ce site, Ce(2) is bonded in a 8-coordinate geometry to one S(2), one S(6), two equivalent S(1), two equivalent S(4), and two equivalent S(5) atoms. There are eleven inequivalent S sites. In the first S site, S(1) is bonded to one Er(6), two equivalent Er(2), and two equivalent Ce(2) atoms to form SCe2Er3 square pyramids that share corners with two equivalent S(5)Ce2Er3 square pyramids, corners with two equivalent S(2)Ce3Er2 trigonal bipyramids, corners with two equivalent S(4)Ce3Er2 trigonal bipyramids,  an edgeedge with one S(5)Ce2Er3 square pyramid, edges with two equivalent S(1)Ce2Er3 square pyramids, edges with two equivalent S(10)Ce2Er3 square pyramids,  an edgeedge with one S(4)Ce3Er2 trigonal bipyramid, and edges with two equivalent S(6)CeEr3 trigonal pyramids. In the second S site, S(2) is bonded to two equivalent Er(1), one Ce(2), and two equivalent Ce(1) atoms to form distorted SCe3Er2 trigonal bipyramids that share corners with two equivalent S(1)Ce2Er3 square pyramids, corners with two equivalent S(10)Ce2Er3 square pyramids, corners with two equivalent S(8)Ce2Er3 trigonal bipyramids,  a cornercorner with one S(6)CeEr3 trigonal pyramid,  an edgeedge with one S(10)Ce2Er3 square pyramid, edges with two equivalent S(5)Ce2Er3 square pyramids,  an edgeedge with one S(8)Ce2Er3 trigonal bipyramid, edges with two equivalent S(2)Ce3Er2 trigonal bipyramids, and edges with two equivalent S(4)Ce3Er2 trigonal bipyramids. In the third S site, S(3) is bonded in a rectangular see-saw-like geometry to one Er(2), one Er(5), and two equivalent Er(1) atoms. In the fourth S site, S(4) is bonded to two equivalent Er(4), one Ce(1), and two equivalent Ce(2) atoms to form distorted SCe3Er2 trigonal bipyramids that share corners with two equivalent S(1)Ce2Er3 square pyramids, corners with two equivalent S(10)Ce2Er3 square pyramids, corners with two equivalent S(5)Ce2Er3 square pyramids, corners with four equivalent S(7)Er4 trigonal pyramids,  an edgeedge with one S(1)Ce2Er3 square pyramid,  an edgeedge with one S(5)Ce2Er3 square pyramid, edges with two equivalent S(8)Ce2Er3 trigonal bipyramids, edges with two equivalent S(2)Ce3Er2 trigonal bipyramids, edges with two equivalent S(4)Ce3Er2 trigonal bipyramids,  an edgeedge with one S(7)Er4 trigonal pyramid, and edges with two equivalent S(6)CeEr3 trigonal pyramids. In the fifth S site, S(5) is bonded to one Er(1), two equivalent Er(5), and two equivalent Ce(2) atoms to form SCe2Er3 square pyramids that share corners with two equivalent S(1)Ce2Er3 square pyramids, corners with two equivalent S(5)Ce2Er3 square pyramids, corners with two equivalent S(4)Ce3Er2 trigonal bipyramids, corners with two equivalent S(6)CeEr3 trigonal pyramids,  an edgeedge with one S(1)Ce2Er3 square pyramid, edges with three equivalent S(5)Ce2Er3 square pyramids,  an edgeedge with one S(4)Ce3Er2 trigonal bipyramid, and edges with two equivalent S(2)Ce3Er2 trigonal bipyramids. In the sixth S site, S(6) is bonded to one Er(4), two equivalent Er(6), and one Ce(2) atom to form SCeEr3 trigonal pyramids that share corners with two equivalent S(10)Ce2Er3 square pyramids, corners with two equivalent S(5)Ce2Er3 square pyramids,  a cornercorner with one S(8)Ce2Er3 trigonal bipyramid,  a cornercorner with one S(2)Ce3Er2 trigonal bipyramid, corners with two equivalent S(6)CeEr3 trigonal pyramids, corners with three equivalent S(7)Er4 trigonal pyramids,  an edgeedge with one S(10)Ce2Er3 square pyramid, edges with two equivalent S(1)Ce2Er3 square pyramids, and edges with two equivalent S(4)Ce3Er2 trigonal bipyramids. In the seventh S site, S(7) is bonded to one Er(3) and three equivalent Er(4) atoms to form distorted SEr4 trigonal pyramids that share  a cornercorner with one S(8)Ce2Er3 trigonal bipyramid, corners with four equivalent S(4)Ce3Er2 trigonal bipyramids, corners with two equivalent S(7)Er4 trigonal pyramids, corners with three equivalent S(6)CeEr3 trigonal pyramids,  an edgeedge with one S(4)Ce3Er2 trigonal bipyramid, edges with two equivalent S(8)Ce2Er3 trigonal bipyramids, and edges with two equivalent S(7)Er4 trigonal pyramids. In the eighth S site, S(8) is bonded to one Er(4), two equivalent Er(3), and two equivalent Ce(1) atoms to form SCe2Er3 trigonal bipyramids that share corners with two equivalent S(10)Ce2Er3 square pyramids, corners with two equivalent S(2)Ce3Er2 trigonal bipyramids,  a cornercorner with one S(6)CeEr3 trigonal pyramid,  a cornercorner with one S(7)Er4 trigonal pyramid,  an edgeedge with one S(10)Ce2Er3 square pyramid,  an edgeedge with one S(2)Ce3Er2 trigonal bipyramid, edges with two equivalent S(8)Ce2Er3 trigonal bipyramids, edges with two equivalent S(4)Ce3Er2 trigonal bipyramids, and edges with two equivalent S(7)Er4 trigonal pyramids. In the ninth S site, S(9) is bonded in a 3-coordinate geometry to one Er(1), two equivalent Er(2), and one Ce(1) atom. In the tenth S site, S(10) is bonded to one Er(2), two equivalent Er(6), and two equivalent Ce(1) atoms to form SCe2Er3 square pyramids that share corners with two equivalent S(8)Ce2Er3 trigonal bipyramids, corners with two equivalent S(2)Ce3Er2 trigonal bipyramids, corners with two equivalent S(4)Ce3Er2 trigonal bipyramids, corners with two equivalent S(6)CeEr3 trigonal pyramids, edges with two equivalent S(1)Ce2Er3 square pyramids, edges with two equivalent S(10)Ce2Er3 square pyramids,  an edgeedge with one S(8)Ce2Er3 trigonal bipyramid,  an edgeedge with one S(2)Ce3Er2 trigonal bipyramid, and  an edgeedge with one S(6)CeEr3 trigonal pyramid. In the eleventh S site, S(11) is bonded in a rectangular see-saw-like geometry to one Er(6) and three equivalent Er(3) atoms. is represented by the CIF card [CIF]
data_Ce4(ErS2)11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.930
_cell_length_b   11.361
_cell_length_c   19.675
_cell_angle_alpha   91.451
_cell_angle_beta   95.732
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   873.767
_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
  Ce  Ce0  1  0.367  0.348  0.734  1.0
  Ce  Ce1  1  0.633  0.652  0.266  1.0
  Ce  Ce2  1  0.104  0.012  0.209  1.0
  Ce  Ce3  1  0.896  0.988  0.791  1.0
  Er  Er4  1  0.462  0.271  0.924  1.0
  Er  Er5  1  0.538  0.729  0.076  1.0
  Er  Er6  1  0.070  0.361  0.139  1.0
  Er  Er7  1  0.930  0.639  0.861  1.0
  Er  Er8  1  0.263  0.352  0.526  1.0
  Er  Er9  1  0.737  0.648  0.474  1.0
  Er  Er10  1  0.798  0.059  0.595  1.0
  Er  Er11  1  0.202  0.941  0.405  1.0
  Er  Er12  1  0.000  0.000  0.000  1.0
  Er  Er13  1  0.658  0.301  0.315  1.0
  Er  Er14  1  0.342  0.699  0.685  1.0
  S  S15  1  0.593  0.212  0.185  1.0
  S  S16  1  0.407  0.788  0.815  1.0
  S  S17  1  0.088  0.751  0.176  1.0
  S  S18  1  0.912  0.249  0.824  1.0
  S  S19  1  0.008  0.241  0.016  1.0
  S  S20  1  0.992  0.759  0.984  1.0
  S  S21  1  0.350  0.092  0.701  1.0
  S  S22  1  0.650  0.908  0.299  1.0
  S  S23  1  0.453  0.031  0.906  1.0
  S  S24  1  0.547  0.969  0.094  1.0
  S  S25  1  0.169  0.151  0.338  1.0
  S  S26  1  0.831  0.849  0.662  1.0
  S  S27  1  0.255  0.119  0.510  1.0
  S  S28  1  0.745  0.881  0.490  1.0
  S  S29  1  0.189  0.690  0.378  1.0
  S  S30  1  0.811  0.310  0.622  1.0
  S  S31  1  0.445  0.493  0.890  1.0
  S  S32  1  0.555  0.507  0.110  1.0
  S  S33  1  0.135  0.454  0.270  1.0
  S  S34  1  0.865  0.546  0.730  1.0
  S  S35  1  0.280  0.589  0.561  1.0
  S  S36  1  0.720  0.411  0.439  1.0
[/CIF]
.
The structure described by Ce4(ErS2)11 crystallizes in the monoclinic C2/m space group. There are six inequivalent Er sites. In the first Er site, Er(1) is bonded to one S(5), one S(9), two equivalent S(2), and two equivalent S(3) atoms to form a mixture of edge and corner-sharing ErS6 octahedra. The corner-sharing octahedral tilt angles range from 48-59°. In the second Er site, Er(2) is bonded to one S(10), one S(3), two equivalent S(1), and two equivalent S(9) atoms to form a mixture of edge and corner-sharing ErS6 octahedra. The corner-sharing octahedral tilt angles range from 48-59°. In the third Er site, Er(3) is bonded to one S(7), two equivalent S(8), and three equivalent S(11) atoms to form ErS6 octahedra that share corners with three equivalent Er(6)S6 octahedra,  a cornercorner with one Er(4)S7 pentagonal bipyramid, edges with four equivalent Er(3)S6 octahedra, and edges with two equivalent Er(4)S7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 50-63°. In the fourth Er site, Er(4) is bonded to one S(6), one S(8), two equivalent S(4), and three equivalent S(7) atoms to form distorted ErS7 pentagonal bipyramids that share  a cornercorner with one Er(3)S6 octahedra, corners with two equivalent Er(6)S6 octahedra, edges with two equivalent Er(3)S6 octahedra, and edges with four equivalent Er(4)S7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 39-49°. In the fifth Er site, Er(5) is bonded to two equivalent S(3) and four equivalent S(5) atoms to form a mixture of edge and corner-sharing ErS6 octahedra. The corner-sharing octahedral tilt angles are 55°. In the sixth Er site, Er(6) is bonded to one S(1), one S(11), two equivalent S(10), and two equivalent S(6) atoms to form ErS6 octahedra that share corners with three equivalent Er(3)S6 octahedra, corners with two equivalent Er(4)S7 pentagonal bipyramids, edges with two equivalent Er(2)S6 octahedra, and edges with two equivalent Er(6)S6 octahedra. The corner-sharing octahedral tilt angles range from 50-63°. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 8-coordinate geometry to one S(4), one S(9), two equivalent S(10), two equivalent S(2), and two equivalent S(8) atoms. In the second Ce site, Ce(2) is bonded in a 8-coordinate geometry to one S(2), one S(6), two equivalent S(1), two equivalent S(4), and two equivalent S(5) atoms. There are eleven inequivalent S sites. In the first S site, S(1) is bonded to one Er(6), two equivalent Er(2), and two equivalent Ce(2) atoms to form SCe2Er3 square pyramids that share corners with two equivalent S(5)Ce2Er3 square pyramids, corners with two equivalent S(2)Ce3Er2 trigonal bipyramids, corners with two equivalent S(4)Ce3Er2 trigonal bipyramids,  an edgeedge with one S(5)Ce2Er3 square pyramid, edges with two equivalent S(1)Ce2Er3 square pyramids, edges with two equivalent S(10)Ce2Er3 square pyramids,  an edgeedge with one S(4)Ce3Er2 trigonal bipyramid, and edges with two equivalent S(6)CeEr3 trigonal pyramids. In the second S site, S(2) is bonded to two equivalent Er(1), one Ce(2), and two equivalent Ce(1) atoms to form distorted SCe3Er2 trigonal bipyramids that share corners with two equivalent S(1)Ce2Er3 square pyramids, corners with two equivalent S(10)Ce2Er3 square pyramids, corners with two equivalent S(8)Ce2Er3 trigonal bipyramids,  a cornercorner with one S(6)CeEr3 trigonal pyramid,  an edgeedge with one S(10)Ce2Er3 square pyramid, edges with two equivalent S(5)Ce2Er3 square pyramids,  an edgeedge with one S(8)Ce2Er3 trigonal bipyramid, edges with two equivalent S(2)Ce3Er2 trigonal bipyramids, and edges with two equivalent S(4)Ce3Er2 trigonal bipyramids. In the third S site, S(3) is bonded in a rectangular see-saw-like geometry to one Er(2), one Er(5), and two equivalent Er(1) atoms. In the fourth S site, S(4) is bonded to two equivalent Er(4), one Ce(1), and two equivalent Ce(2) atoms to form distorted SCe3Er2 trigonal bipyramids that share corners with two equivalent S(1)Ce2Er3 square pyramids, corners with two equivalent S(10)Ce2Er3 square pyramids, corners with two equivalent S(5)Ce2Er3 square pyramids, corners with four equivalent S(7)Er4 trigonal pyramids,  an edgeedge with one S(1)Ce2Er3 square pyramid,  an edgeedge with one S(5)Ce2Er3 square pyramid, edges with two equivalent S(8)Ce2Er3 trigonal bipyramids, edges with two equivalent S(2)Ce3Er2 trigonal bipyramids, edges with two equivalent S(4)Ce3Er2 trigonal bipyramids,  an edgeedge with one S(7)Er4 trigonal pyramid, and edges with two equivalent S(6)CeEr3 trigonal pyramids. In the fifth S site, S(5) is bonded to one Er(1), two equivalent Er(5), and two equivalent Ce(2) atoms to form SCe2Er3 square pyramids that share corners with two equivalent S(1)Ce2Er3 square pyramids, corners with two equivalent S(5)Ce2Er3 square pyramids, corners with two equivalent S(4)Ce3Er2 trigonal bipyramids, corners with two equivalent S(6)CeEr3 trigonal pyramids,  an edgeedge with one S(1)Ce2Er3 square pyramid, edges with three equivalent S(5)Ce2Er3 square pyramids,  an edgeedge with one S(4)Ce3Er2 trigonal bipyramid, and edges with two equivalent S(2)Ce3Er2 trigonal bipyramids. In the sixth S site, S(6) is bonded to one Er(4), two equivalent Er(6), and one Ce(2) atom to form SCeEr3 trigonal pyramids that share corners with two equivalent S(10)Ce2Er3 square pyramids, corners with two equivalent S(5)Ce2Er3 square pyramids,  a cornercorner with one S(8)Ce2Er3 trigonal bipyramid,  a cornercorner with one S(2)Ce3Er2 trigonal bipyramid, corners with two equivalent S(6)CeEr3 trigonal pyramids, corners with three equivalent S(7)Er4 trigonal pyramids,  an edgeedge with one S(10)Ce2Er3 square pyramid, edges with two equivalent S(1)Ce2Er3 square pyramids, and edges with two equivalent S(4)Ce3Er2 trigonal bipyramids. In the seventh S site, S(7) is bonded to one Er(3) and three equivalent Er(4) atoms to form distorted SEr4 trigonal pyramids that share  a cornercorner with one S(8)Ce2Er3 trigonal bipyramid, corners with four equivalent S(4)Ce3Er2 trigonal bipyramids, corners with two equivalent S(7)Er4 trigonal pyramids, corners with three equivalent S(6)CeEr3 trigonal pyramids,  an edgeedge with one S(4)Ce3Er2 trigonal bipyramid, edges with two equivalent S(8)Ce2Er3 trigonal bipyramids, and edges with two equivalent S(7)Er4 trigonal pyramids. In the eighth S site, S(8) is bonded to one Er(4), two equivalent Er(3), and two equivalent Ce(1) atoms to form SCe2Er3 trigonal bipyramids that share corners with two equivalent S(10)Ce2Er3 square pyramids, corners with two equivalent S(2)Ce3Er2 trigonal bipyramids,  a cornercorner with one S(6)CeEr3 trigonal pyramid,  a cornercorner with one S(7)Er4 trigonal pyramid,  an edgeedge with one S(10)Ce2Er3 square pyramid,  an edgeedge with one S(2)Ce3Er2 trigonal bipyramid, edges with two equivalent S(8)Ce2Er3 trigonal bipyramids, edges with two equivalent S(4)Ce3Er2 trigonal bipyramids, and edges with two equivalent S(7)Er4 trigonal pyramids. In the ninth S site, S(9) is bonded in a 3-coordinate geometry to one Er(1), two equivalent Er(2), and one Ce(1) atom. In the tenth S site, S(10) is bonded to one Er(2), two equivalent Er(6), and two equivalent Ce(1) atoms to form SCe2Er3 square pyramids that share corners with two equivalent S(8)Ce2Er3 trigonal bipyramids, corners with two equivalent S(2)Ce3Er2 trigonal bipyramids, corners with two equivalent S(4)Ce3Er2 trigonal bipyramids, corners with two equivalent S(6)CeEr3 trigonal pyramids, edges with two equivalent S(1)Ce2Er3 square pyramids, edges with two equivalent S(10)Ce2Er3 square pyramids,  an edgeedge with one S(8)Ce2Er3 trigonal bipyramid,  an edgeedge with one S(2)Ce3Er2 trigonal bipyramid, and  an edgeedge with one S(6)CeEr3 trigonal pyramid. In the eleventh S site, S(11) is bonded in a rectangular see-saw-like geometry to one Er(6) and three equivalent Er(3) atoms. is represented by the CIF card [CIF]
data_Ce4(ErS2)11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.930
_cell_length_b   11.361
_cell_length_c   19.675
_cell_angle_alpha   91.451
_cell_angle_beta   95.732
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   873.767
_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
  Ce  Ce0  1  0.367  0.348  0.734  1.0
  Ce  Ce1  1  0.633  0.652  0.266  1.0
  Ce  Ce2  1  0.104  0.012  0.209  1.0
  Ce  Ce3  1  0.896  0.988  0.791  1.0
  Er  Er4  1  0.462  0.271  0.924  1.0
  Er  Er5  1  0.538  0.729  0.076  1.0
  Er  Er6  1  0.070  0.361  0.139  1.0
  Er  Er7  1  0.930  0.639  0.861  1.0
  Er  Er8  1  0.263  0.352  0.526  1.0
  Er  Er9  1  0.737  0.648  0.474  1.0
  Er  Er10  1  0.798  0.059  0.595  1.0
  Er  Er11  1  0.202  0.941  0.405  1.0
  Er  Er12  1  0.000  0.000  0.000  1.0
  Er  Er13  1  0.658  0.301  0.315  1.0
  Er  Er14  1  0.342  0.699  0.685  1.0
  S  S15  1  0.593  0.212  0.185  1.0
  S  S16  1  0.407  0.788  0.815  1.0
  S  S17  1  0.088  0.751  0.176  1.0
  S  S18  1  0.912  0.249  0.824  1.0
  S  S19  1  0.008  0.241  0.016  1.0
  S  S20  1  0.992  0.759  0.984  1.0
  S  S21  1  0.350  0.092  0.701  1.0
  S  S22  1  0.650  0.908  0.299  1.0
  S  S23  1  0.453  0.031  0.906  1.0
  S  S24  1  0.547  0.969  0.094  1.0
  S  S25  1  0.169  0.151  0.338  1.0
  S  S26  1  0.831  0.849  0.662  1.0
  S  S27  1  0.255  0.119  0.510  1.0
  S  S28  1  0.745  0.881  0.490  1.0
  S  S29  1  0.189  0.690  0.378  1.0
  S  S30  1  0.811  0.310  0.622  1.0
  S  S31  1  0.445  0.493  0.890  1.0
  S  S32  1  0.555  0.507  0.110  1.0
  S  S33  1  0.135  0.454  0.270  1.0
  S  S34  1  0.865  0.546  0.730  1.0
  S  S35  1  0.280  0.589  0.561  1.0
  S  S36  1  0.720  0.411  0.439  1.0
[/CIF]
.