The structure described by Eu5Si(O2Cl3)2 crystallizes in the monoclinic C2/c space group. There are three inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one Cl(2), one Cl(4), two equivalent Cl(1), and three equivalent Cl(3) atoms. In the second Eu site, Eu(2) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent Cl(1), two equivalent Cl(3), and two equivalent Cl(4) atoms. In the third Eu site, Eu(3) is bonded in a 7-coordinate geometry to one O(2), two equivalent O(1), one Cl(2), one Cl(4), two equivalent Cl(1), and two equivalent Cl(3) atoms. Si(1) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Eu(1), two equivalent Eu(3), and one Si(1) atom. In the second O site, O(2) is bonded to one Eu(1), one Eu(2), one Eu(3), and one Si(1) atom to form distorted OEu3Si trigonal pyramids that share corners with four equivalent Cl(1)Eu5 trigonal bipyramids, edges with two equivalent Cl(4)Eu6 octahedra,  an edgeedge with one Cl(1)Eu5 trigonal bipyramid, and  an edgeedge with one O(2)Eu3Si trigonal pyramid. There are four inequivalent Cl sites. In the first Cl site, Cl(4) is bonded to two equivalent Eu(1), two equivalent Eu(2), and two equivalent Eu(3) atoms to form ClEu6 octahedra that share corners with two equivalent Cl(4)Eu6 octahedra, corners with six equivalent Cl(1)Eu5 trigonal bipyramids, edges with four equivalent O(2)Eu3Si trigonal pyramids, and faces with two equivalent Cl(1)Eu5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 25°. In the second Cl site, Cl(1) is bonded to one Eu(2), two equivalent Eu(1), and two equivalent Eu(3) atoms to form distorted ClEu5 trigonal bipyramids that share corners with three equivalent Cl(4)Eu6 octahedra,  a cornercorner with one Cl(1)Eu5 trigonal bipyramid, corners with four equivalent O(2)Eu3Si trigonal pyramids, edges with two equivalent Cl(1)Eu5 trigonal bipyramids,  an edgeedge with one O(2)Eu3Si trigonal pyramid, and  a faceface with one Cl(4)Eu6 octahedra. The corner-sharing octahedral tilt angles range from 37-66°. In the third Cl site, Cl(2) is bonded in a distorted see-saw-like geometry to two equivalent Eu(1) and two equivalent Eu(3) atoms. In the fourth Cl site, Cl(3) is bonded in a 6-coordinate geometry to one Eu(2), two equivalent Eu(3), and three equivalent Eu(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Eu5Si(Cl3O2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.273
_cell_length_b   8.273
_cell_length_c   11.101
_cell_angle_alpha   82.821
_cell_angle_beta   82.821
_cell_angle_gamma   114.756
_symmetry_Int_Tables_number   1
_cell_volume   671.082
_cell_formula_units_Z   2
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
  Eu  Eu0  1  0.269  0.427  0.632  1.0
  Eu  Eu1  1  0.731  0.573  0.368  1.0
  Eu  Eu2  1  0.573  0.731  0.868  1.0
  Eu  Eu3  1  0.427  0.269  0.132  1.0
  Eu  Eu4  1  0.700  0.300  0.750  1.0
  Eu  Eu5  1  0.817  0.075  0.481  1.0
  Eu  Eu6  1  0.925  0.183  0.019  1.0
  Eu  Eu7  1  0.075  0.817  0.981  1.0
  Eu  Eu8  1  0.183  0.925  0.519  1.0
  Eu  Eu9  1  0.300  0.700  0.250  1.0
  Si  Si10  1  0.922  0.078  0.750  1.0
  Si  Si11  1  0.078  0.922  0.250  1.0
  Cl  Cl12  1  0.519  0.219  0.548  1.0
  Cl  Cl13  1  0.481  0.781  0.452  1.0
  Cl  Cl14  1  0.746  0.254  0.250  1.0
  Cl  Cl15  1  0.706  0.645  0.640  1.0
  Cl  Cl16  1  0.254  0.746  0.750  1.0
  Cl  Cl17  1  0.645  0.706  0.140  1.0
  Cl  Cl18  1  0.781  0.481  0.952  1.0
  Cl  Cl19  1  0.219  0.519  0.048  1.0
  Cl  Cl20  1  0.500  0.000  0.000  1.0
  Cl  Cl21  1  0.355  0.294  0.860  1.0
  Cl  Cl22  1  0.294  0.355  0.360  1.0
  Cl  Cl23  1  0.000  0.500  0.500  1.0
  O  O24  1  0.063  0.101  0.625  1.0
  O  O25  1  0.101  0.063  0.125  1.0
  O  O26  1  0.981  0.278  0.787  1.0
  O  O27  1  0.899  0.937  0.875  1.0
  O  O28  1  0.019  0.722  0.213  1.0
  O  O29  1  0.722  0.019  0.713  1.0
  O  O30  1  0.278  0.981  0.287  1.0
  O  O31  1  0.937  0.899  0.375  1.0
[/CIF]
.
The structure described by Eu5Si(O2Cl3)2 crystallizes in the monoclinic C2/c space group. There are three inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one Cl(2), one Cl(4), two equivalent Cl(1), and three equivalent Cl(3) atoms. In the second Eu site, Eu(2) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent Cl(1), two equivalent Cl(3), and two equivalent Cl(4) atoms. In the third Eu site, Eu(3) is bonded in a 7-coordinate geometry to one O(2), two equivalent O(1), one Cl(2), one Cl(4), two equivalent Cl(1), and two equivalent Cl(3) atoms. Si(1) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Eu(1), two equivalent Eu(3), and one Si(1) atom. In the second O site, O(2) is bonded to one Eu(1), one Eu(2), one Eu(3), and one Si(1) atom to form distorted OEu3Si trigonal pyramids that share corners with four equivalent Cl(1)Eu5 trigonal bipyramids, edges with two equivalent Cl(4)Eu6 octahedra,  an edgeedge with one Cl(1)Eu5 trigonal bipyramid, and  an edgeedge with one O(2)Eu3Si trigonal pyramid. There are four inequivalent Cl sites. In the first Cl site, Cl(4) is bonded to two equivalent Eu(1), two equivalent Eu(2), and two equivalent Eu(3) atoms to form ClEu6 octahedra that share corners with two equivalent Cl(4)Eu6 octahedra, corners with six equivalent Cl(1)Eu5 trigonal bipyramids, edges with four equivalent O(2)Eu3Si trigonal pyramids, and faces with two equivalent Cl(1)Eu5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 25°. In the second Cl site, Cl(1) is bonded to one Eu(2), two equivalent Eu(1), and two equivalent Eu(3) atoms to form distorted ClEu5 trigonal bipyramids that share corners with three equivalent Cl(4)Eu6 octahedra,  a cornercorner with one Cl(1)Eu5 trigonal bipyramid, corners with four equivalent O(2)Eu3Si trigonal pyramids, edges with two equivalent Cl(1)Eu5 trigonal bipyramids,  an edgeedge with one O(2)Eu3Si trigonal pyramid, and  a faceface with one Cl(4)Eu6 octahedra. The corner-sharing octahedral tilt angles range from 37-66°. In the third Cl site, Cl(2) is bonded in a distorted see-saw-like geometry to two equivalent Eu(1) and two equivalent Eu(3) atoms. In the fourth Cl site, Cl(3) is bonded in a 6-coordinate geometry to one Eu(2), two equivalent Eu(3), and three equivalent Eu(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Eu5Si(Cl3O2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.273
_cell_length_b   8.273
_cell_length_c   11.101
_cell_angle_alpha   82.821
_cell_angle_beta   82.821
_cell_angle_gamma   114.756
_symmetry_Int_Tables_number   1
_cell_volume   671.082
_cell_formula_units_Z   2
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
  Eu  Eu0  1  0.269  0.427  0.632  1.0
  Eu  Eu1  1  0.731  0.573  0.368  1.0
  Eu  Eu2  1  0.573  0.731  0.868  1.0
  Eu  Eu3  1  0.427  0.269  0.132  1.0
  Eu  Eu4  1  0.700  0.300  0.750  1.0
  Eu  Eu5  1  0.817  0.075  0.481  1.0
  Eu  Eu6  1  0.925  0.183  0.019  1.0
  Eu  Eu7  1  0.075  0.817  0.981  1.0
  Eu  Eu8  1  0.183  0.925  0.519  1.0
  Eu  Eu9  1  0.300  0.700  0.250  1.0
  Si  Si10  1  0.922  0.078  0.750  1.0
  Si  Si11  1  0.078  0.922  0.250  1.0
  Cl  Cl12  1  0.519  0.219  0.548  1.0
  Cl  Cl13  1  0.481  0.781  0.452  1.0
  Cl  Cl14  1  0.746  0.254  0.250  1.0
  Cl  Cl15  1  0.706  0.645  0.640  1.0
  Cl  Cl16  1  0.254  0.746  0.750  1.0
  Cl  Cl17  1  0.645  0.706  0.140  1.0
  Cl  Cl18  1  0.781  0.481  0.952  1.0
  Cl  Cl19  1  0.219  0.519  0.048  1.0
  Cl  Cl20  1  0.500  0.000  0.000  1.0
  Cl  Cl21  1  0.355  0.294  0.860  1.0
  Cl  Cl22  1  0.294  0.355  0.360  1.0
  Cl  Cl23  1  0.000  0.500  0.500  1.0
  O  O24  1  0.063  0.101  0.625  1.0
  O  O25  1  0.101  0.063  0.125  1.0
  O  O26  1  0.981  0.278  0.787  1.0
  O  O27  1  0.899  0.937  0.875  1.0
  O  O28  1  0.019  0.722  0.213  1.0
  O  O29  1  0.722  0.019  0.713  1.0
  O  O30  1  0.278  0.981  0.287  1.0
  O  O31  1  0.937  0.899  0.375  1.0
[/CIF]
.