The structure described by RbSmGeSe4 crystallizes in the triclinic P1 space group. There are four inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 8-coordinate geometry to one Se(12), one Se(13), one Se(2), one Se(5), one Se(6), one Se(8), and two equivalent Se(11) atoms. In the second Rb site, Rb(2) is bonded in a 8-coordinate geometry to one Se(1), one Se(14), one Se(16), one Se(3), one Se(4), one Se(7), and two equivalent Se(15) atoms. In the third Rb site, Rb(3) is bonded in a 8-coordinate geometry to one Se(11), one Se(12), one Se(2), one Se(5), one Se(6), one Se(9), and two equivalent Se(13) atoms. In the fourth Rb site, Rb(4) is bonded in a 8-coordinate geometry to one Se(10), one Se(14), one Se(15), one Se(16), one Se(4), one Se(7), and two equivalent Se(3) atoms. There are four inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 7-coordinate geometry to one Se(10), one Se(12), one Se(16), one Se(3), one Se(4), one Se(5), and one Se(8) atom. In the second Sm site, Sm(2) is bonded in a 7-coordinate geometry to one Se(1), one Se(14), one Se(15), one Se(2), one Se(6), one Se(7), and one Se(9) atom. In the third Sm site, Sm(3) is bonded to one Se(10), one Se(11), one Se(12), one Se(16), one Se(4), one Se(5), and one Se(8) atom to form distorted SmSe7 pentagonal bipyramids that share  a cornercorner with one Ge(4)Se4 tetrahedra,  an edgeedge with one Ge(4)Se4 tetrahedra, and edges with two equivalent Ge(3)Se4 tetrahedra. In the fourth Sm site, Sm(4) is bonded in a 7-coordinate geometry to one Se(1), one Se(13), one Se(14), one Se(2), one Se(6), one Se(7), and one Se(9) atom. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a tetrahedral geometry to one Se(14), one Se(15), one Se(7), and one Se(9) atom. In the second Ge site, Ge(2) is bonded in a tetrahedral geometry to one Se(1), one Se(13), one Se(2), and one Se(6) atom. In the third Ge site, Ge(3) is bonded to one Se(10), one Se(11), one Se(12), and one Se(5) atom to form GeSe4 tetrahedra that share edges with two equivalent Sm(3)Se7 pentagonal bipyramids. In the fourth Ge site, Ge(4) is bonded to one Se(16), one Se(3), one Se(4), and one Se(8) atom to form GeSe4 tetrahedra that share  a cornercorner with one Sm(3)Se7 pentagonal bipyramid and  an edgeedge with one Sm(3)Se7 pentagonal bipyramid. There are sixteen inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted see-saw-like geometry to one Rb(2), one Sm(2), one Sm(4), and one Ge(2) atom. In the second Se site, Se(2) is bonded in a 3-coordinate geometry to one Rb(1), one Rb(3), one Sm(2), one Sm(4), and one Ge(2) atom. In the third Se site, Se(3) is bonded to one Rb(2), two equivalent Rb(4), one Sm(1), and one Ge(4) atom to form distorted corner-sharing SeRb3SmGe trigonal bipyramids. In the fourth Se site, Se(4) is bonded in a 5-coordinate geometry to one Rb(2), one Rb(4), one Sm(1), one Sm(3), and one Ge(4) atom. In the fifth Se site, Se(5) is bonded in a 5-coordinate geometry to one Rb(1), one Rb(3), one Sm(1), one Sm(3), and one Ge(3) atom. In the sixth Se site, Se(6) is bonded in a 5-coordinate geometry to one Rb(1), one Rb(3), one Sm(2), one Sm(4), and one Ge(2) atom. In the seventh Se site, Se(7) is bonded in a 5-coordinate geometry to one Rb(2), one Rb(4), one Sm(2), one Sm(4), and one Ge(1) atom. In the eighth Se site, Se(8) is bonded in a distorted see-saw-like geometry to one Rb(1), one Sm(1), one Sm(3), and one Ge(4) atom. In the ninth Se site, Se(9) is bonded in a distorted see-saw-like geometry to one Rb(3), one Sm(2), one Sm(4), and one Ge(1) atom. In the tenth Se site, Se(10) is bonded in a distorted see-saw-like geometry to one Rb(4), one Sm(1), one Sm(3), and one Ge(3) atom. In the eleventh Se site, Se(11) is bonded to one Rb(3), two equivalent Rb(1), one Sm(3), and one Ge(3) atom to form distorted corner-sharing SeRb3SmGe trigonal bipyramids. In the twelfth Se site, Se(12) is bonded in a 5-coordinate geometry to one Rb(1), one Rb(3), one Sm(1), one Sm(3), and one Ge(3) atom. In the thirteenth Se site, Se(13) is bonded to one Rb(1), two equivalent Rb(3), one Sm(4), and one Ge(2) atom to form distorted corner-sharing SeRb3SmGe trigonal bipyramids. In the fourteenth Se site, Se(14) is bonded in a 5-coordinate geometry to one Rb(2), one Rb(4), one Sm(2), one Sm(4), and one Ge(1) atom. In the fifteenth Se site, Se(15) is bonded to one Rb(4), two equivalent Rb(2), one Sm(2), and one Ge(1) atom to form distorted corner-sharing SeRb3SmGe trigonal bipyramids. In the sixteenth Se site, Se(16) is bonded in a 5-coordinate geometry to one Rb(2), one Rb(4), one Sm(1), one Sm(3), and one Ge(4) atom. is represented by the CIF file [CIF]
data_RbSmGeSe4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.856
_cell_length_b   7.122
_cell_length_c   18.125
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   884.954
_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
  Rb  Rb0  1  0.517  0.994  0.531  1.0
  Rb  Rb1  1  0.996  0.003  0.033  1.0
  Rb  Rb2  1  0.006  0.499  0.469  1.0
  Rb  Rb3  1  0.496  0.498  0.967  1.0
  Sm  Sm4  1  0.789  0.018  0.776  1.0
  Sm  Sm5  1  0.291  0.472  0.226  1.0
  Sm  Sm6  1  0.213  0.524  0.725  1.0
  Sm  Sm7  1  0.702  0.983  0.275  1.0
  Ge  Ge8  1  0.796  0.513  0.165  1.0
  Ge  Ge9  1  0.216  0.015  0.338  1.0
  Ge  Ge10  1  0.707  0.480  0.664  1.0
  Ge  Ge11  1  0.287  0.981  0.835  1.0
  Se  Se12  1  0.107  0.083  0.214  1.0
  Se  Se13  1  0.452  0.255  0.357  1.0
  Se  Se14  1  0.560  0.984  0.913  1.0
  Se  Se15  1  0.090  0.266  0.851  1.0
  Se  Se16  1  0.943  0.241  0.644  1.0
  Se  Se17  1  0.398  0.739  0.352  1.0
  Se  Se18  1  0.594  0.234  0.151  1.0
  Se  Se19  1  0.407  0.915  0.715  1.0
  Se  Se20  1  0.901  0.581  0.288  1.0
  Se  Se21  1  0.598  0.412  0.787  1.0
  Se  Se22  1  0.440  0.493  0.585  1.0
  Se  Se23  1  0.909  0.767  0.648  1.0
  Se  Se24  1  0.939  0.006  0.415  1.0
  Se  Se25  1  0.553  0.762  0.142  1.0
  Se  Se26  1  0.066  0.507  0.084  1.0
  Se  Se27  1  0.050  0.740  0.857  1.0
[/CIF]
.
The structure described by RbSmGeSe4 crystallizes in the triclinic P1 space group. There are four inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 8-coordinate geometry to one Se(12), one Se(13), one Se(2), one Se(5), one Se(6), one Se(8), and two equivalent Se(11) atoms. In the second Rb site, Rb(2) is bonded in a 8-coordinate geometry to one Se(1), one Se(14), one Se(16), one Se(3), one Se(4), one Se(7), and two equivalent Se(15) atoms. In the third Rb site, Rb(3) is bonded in a 8-coordinate geometry to one Se(11), one Se(12), one Se(2), one Se(5), one Se(6), one Se(9), and two equivalent Se(13) atoms. In the fourth Rb site, Rb(4) is bonded in a 8-coordinate geometry to one Se(10), one Se(14), one Se(15), one Se(16), one Se(4), one Se(7), and two equivalent Se(3) atoms. There are four inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 7-coordinate geometry to one Se(10), one Se(12), one Se(16), one Se(3), one Se(4), one Se(5), and one Se(8) atom. In the second Sm site, Sm(2) is bonded in a 7-coordinate geometry to one Se(1), one Se(14), one Se(15), one Se(2), one Se(6), one Se(7), and one Se(9) atom. In the third Sm site, Sm(3) is bonded to one Se(10), one Se(11), one Se(12), one Se(16), one Se(4), one Se(5), and one Se(8) atom to form distorted SmSe7 pentagonal bipyramids that share  a cornercorner with one Ge(4)Se4 tetrahedra,  an edgeedge with one Ge(4)Se4 tetrahedra, and edges with two equivalent Ge(3)Se4 tetrahedra. In the fourth Sm site, Sm(4) is bonded in a 7-coordinate geometry to one Se(1), one Se(13), one Se(14), one Se(2), one Se(6), one Se(7), and one Se(9) atom. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a tetrahedral geometry to one Se(14), one Se(15), one Se(7), and one Se(9) atom. In the second Ge site, Ge(2) is bonded in a tetrahedral geometry to one Se(1), one Se(13), one Se(2), and one Se(6) atom. In the third Ge site, Ge(3) is bonded to one Se(10), one Se(11), one Se(12), and one Se(5) atom to form GeSe4 tetrahedra that share edges with two equivalent Sm(3)Se7 pentagonal bipyramids. In the fourth Ge site, Ge(4) is bonded to one Se(16), one Se(3), one Se(4), and one Se(8) atom to form GeSe4 tetrahedra that share  a cornercorner with one Sm(3)Se7 pentagonal bipyramid and  an edgeedge with one Sm(3)Se7 pentagonal bipyramid. There are sixteen inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted see-saw-like geometry to one Rb(2), one Sm(2), one Sm(4), and one Ge(2) atom. In the second Se site, Se(2) is bonded in a 3-coordinate geometry to one Rb(1), one Rb(3), one Sm(2), one Sm(4), and one Ge(2) atom. In the third Se site, Se(3) is bonded to one Rb(2), two equivalent Rb(4), one Sm(1), and one Ge(4) atom to form distorted corner-sharing SeRb3SmGe trigonal bipyramids. In the fourth Se site, Se(4) is bonded in a 5-coordinate geometry to one Rb(2), one Rb(4), one Sm(1), one Sm(3), and one Ge(4) atom. In the fifth Se site, Se(5) is bonded in a 5-coordinate geometry to one Rb(1), one Rb(3), one Sm(1), one Sm(3), and one Ge(3) atom. In the sixth Se site, Se(6) is bonded in a 5-coordinate geometry to one Rb(1), one Rb(3), one Sm(2), one Sm(4), and one Ge(2) atom. In the seventh Se site, Se(7) is bonded in a 5-coordinate geometry to one Rb(2), one Rb(4), one Sm(2), one Sm(4), and one Ge(1) atom. In the eighth Se site, Se(8) is bonded in a distorted see-saw-like geometry to one Rb(1), one Sm(1), one Sm(3), and one Ge(4) atom. In the ninth Se site, Se(9) is bonded in a distorted see-saw-like geometry to one Rb(3), one Sm(2), one Sm(4), and one Ge(1) atom. In the tenth Se site, Se(10) is bonded in a distorted see-saw-like geometry to one Rb(4), one Sm(1), one Sm(3), and one Ge(3) atom. In the eleventh Se site, Se(11) is bonded to one Rb(3), two equivalent Rb(1), one Sm(3), and one Ge(3) atom to form distorted corner-sharing SeRb3SmGe trigonal bipyramids. In the twelfth Se site, Se(12) is bonded in a 5-coordinate geometry to one Rb(1), one Rb(3), one Sm(1), one Sm(3), and one Ge(3) atom. In the thirteenth Se site, Se(13) is bonded to one Rb(1), two equivalent Rb(3), one Sm(4), and one Ge(2) atom to form distorted corner-sharing SeRb3SmGe trigonal bipyramids. In the fourteenth Se site, Se(14) is bonded in a 5-coordinate geometry to one Rb(2), one Rb(4), one Sm(2), one Sm(4), and one Ge(1) atom. In the fifteenth Se site, Se(15) is bonded to one Rb(4), two equivalent Rb(2), one Sm(2), and one Ge(1) atom to form distorted corner-sharing SeRb3SmGe trigonal bipyramids. In the sixteenth Se site, Se(16) is bonded in a 5-coordinate geometry to one Rb(2), one Rb(4), one Sm(1), one Sm(3), and one Ge(4) atom. is represented by the CIF file [CIF]
data_RbSmGeSe4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.856
_cell_length_b   7.122
_cell_length_c   18.125
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   884.954
_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
  Rb  Rb0  1  0.517  0.994  0.531  1.0
  Rb  Rb1  1  0.996  0.003  0.033  1.0
  Rb  Rb2  1  0.006  0.499  0.469  1.0
  Rb  Rb3  1  0.496  0.498  0.967  1.0
  Sm  Sm4  1  0.789  0.018  0.776  1.0
  Sm  Sm5  1  0.291  0.472  0.226  1.0
  Sm  Sm6  1  0.213  0.524  0.725  1.0
  Sm  Sm7  1  0.702  0.983  0.275  1.0
  Ge  Ge8  1  0.796  0.513  0.165  1.0
  Ge  Ge9  1  0.216  0.015  0.338  1.0
  Ge  Ge10  1  0.707  0.480  0.664  1.0
  Ge  Ge11  1  0.287  0.981  0.835  1.0
  Se  Se12  1  0.107  0.083  0.214  1.0
  Se  Se13  1  0.452  0.255  0.357  1.0
  Se  Se14  1  0.560  0.984  0.913  1.0
  Se  Se15  1  0.090  0.266  0.851  1.0
  Se  Se16  1  0.943  0.241  0.644  1.0
  Se  Se17  1  0.398  0.739  0.352  1.0
  Se  Se18  1  0.594  0.234  0.151  1.0
  Se  Se19  1  0.407  0.915  0.715  1.0
  Se  Se20  1  0.901  0.581  0.288  1.0
  Se  Se21  1  0.598  0.412  0.787  1.0
  Se  Se22  1  0.440  0.493  0.585  1.0
  Se  Se23  1  0.909  0.767  0.648  1.0
  Se  Se24  1  0.939  0.006  0.415  1.0
  Se  Se25  1  0.553  0.762  0.142  1.0
  Se  Se26  1  0.066  0.507  0.084  1.0
  Se  Se27  1  0.050  0.740  0.857  1.0
[/CIF]
.