The crystal structure described by Sr2LaCl7 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Sr sites. In the first Sr site, Sr(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 distorted SrCl7 pentagonal bipyramids that share corners with five equivalent La(1)Cl7 pentagonal bipyramids and  an edgeedge with one La(1)Cl7 pentagonal bipyramid. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one Cl(1), one Cl(2), one Cl(3), one Cl(4), one Cl(5), one Cl(6), and one Cl(7) atom. La(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 distorted LaCl7 pentagonal bipyramids that share corners with five equivalent Sr(1)Cl7 pentagonal bipyramids and  an edgeedge with one Sr(1)Cl7 pentagonal bipyramid. There are seven inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a distorted T-shaped geometry to one Sr(1), one Sr(2), and one La(1) atom. In the second Cl site, Cl(2) is bonded in a trigonal non-coplanar geometry to one Sr(1), one Sr(2), and one La(1) atom. In the third Cl site, Cl(3) is bonded in a trigonal non-coplanar geometry to one Sr(1), one Sr(2), and one La(1) atom. In the fourth Cl site, Cl(4) is bonded in a distorted trigonal non-coplanar geometry to one Sr(1), one Sr(2), and one La(1) atom. In the fifth Cl site, Cl(5) is bonded in a distorted trigonal planar geometry to one Sr(1), one Sr(2), and one La(1) atom. In the sixth Cl site, Cl(6) is bonded in a T-shaped geometry to one Sr(1), one Sr(2), and one La(1) atom. In the seventh Cl site, Cl(7) is bonded in a distorted T-shaped geometry to one Sr(1), one Sr(2), and one La(1) atom. is represented by the CIF file [CIF]
data_Sr2LaCl7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   13.353
_cell_length_b   7.207
_cell_length_c   12.515
_cell_angle_alpha   88.746
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1204.055
_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
  Sr  Sr0  1  0.550  0.302  0.223  1.0
  Sr  Sr1  1  0.858  0.208  0.221  1.0
  Sr  Sr2  1  0.358  0.792  0.279  1.0
  Sr  Sr3  1  0.050  0.698  0.277  1.0
  Sr  Sr4  1  0.950  0.302  0.723  1.0
  Sr  Sr5  1  0.642  0.208  0.721  1.0
  Sr  Sr6  1  0.142  0.792  0.779  1.0
  Sr  Sr7  1  0.450  0.698  0.777  1.0
  La  La8  1  0.239  0.210  0.029  1.0
  La  La9  1  0.739  0.790  0.471  1.0
  La  La10  1  0.261  0.210  0.529  1.0
  La  La11  1  0.761  0.790  0.971  1.0
  Cl  Cl12  1  0.188  0.847  0.107  1.0
  Cl  Cl13  1  0.419  0.042  0.110  1.0
  Cl  Cl14  1  0.381  0.497  0.119  1.0
  Cl  Cl15  1  0.924  0.871  0.108  1.0
  Cl  Cl16  1  0.061  0.356  0.144  1.0
  Cl  Cl17  1  0.683  0.004  0.139  1.0
  Cl  Cl18  1  0.730  0.510  0.136  1.0
  Cl  Cl19  1  0.230  0.490  0.364  1.0
  Cl  Cl20  1  0.183  0.996  0.361  1.0
  Cl  Cl21  1  0.561  0.644  0.356  1.0
  Cl  Cl22  1  0.424  0.129  0.392  1.0
  Cl  Cl23  1  0.881  0.503  0.381  1.0
  Cl  Cl24  1  0.919  0.958  0.390  1.0
  Cl  Cl25  1  0.688  0.153  0.393  1.0
  Cl  Cl26  1  0.312  0.847  0.607  1.0
  Cl  Cl27  1  0.081  0.042  0.610  1.0
  Cl  Cl28  1  0.119  0.497  0.619  1.0
  Cl  Cl29  1  0.576  0.871  0.608  1.0
  Cl  Cl30  1  0.439  0.356  0.644  1.0
  Cl  Cl31  1  0.817  0.004  0.639  1.0
  Cl  Cl32  1  0.770  0.510  0.636  1.0
  Cl  Cl33  1  0.270  0.490  0.864  1.0
  Cl  Cl34  1  0.317  0.996  0.861  1.0
  Cl  Cl35  1  0.939  0.644  0.856  1.0
  Cl  Cl36  1  0.076  0.129  0.892  1.0
  Cl  Cl37  1  0.619  0.503  0.881  1.0
  Cl  Cl38  1  0.581  0.958  0.890  1.0
  Cl  Cl39  1  0.812  0.153  0.893  1.0
[/CIF]
.
The crystal structure described by Sr2LaCl7 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Sr sites. In the first Sr site, Sr(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 distorted SrCl7 pentagonal bipyramids that share corners with five equivalent La(1)Cl7 pentagonal bipyramids and  an edgeedge with one La(1)Cl7 pentagonal bipyramid. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one Cl(1), one Cl(2), one Cl(3), one Cl(4), one Cl(5), one Cl(6), and one Cl(7) atom. La(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 distorted LaCl7 pentagonal bipyramids that share corners with five equivalent Sr(1)Cl7 pentagonal bipyramids and  an edgeedge with one Sr(1)Cl7 pentagonal bipyramid. There are seven inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a distorted T-shaped geometry to one Sr(1), one Sr(2), and one La(1) atom. In the second Cl site, Cl(2) is bonded in a trigonal non-coplanar geometry to one Sr(1), one Sr(2), and one La(1) atom. In the third Cl site, Cl(3) is bonded in a trigonal non-coplanar geometry to one Sr(1), one Sr(2), and one La(1) atom. In the fourth Cl site, Cl(4) is bonded in a distorted trigonal non-coplanar geometry to one Sr(1), one Sr(2), and one La(1) atom. In the fifth Cl site, Cl(5) is bonded in a distorted trigonal planar geometry to one Sr(1), one Sr(2), and one La(1) atom. In the sixth Cl site, Cl(6) is bonded in a T-shaped geometry to one Sr(1), one Sr(2), and one La(1) atom. In the seventh Cl site, Cl(7) is bonded in a distorted T-shaped geometry to one Sr(1), one Sr(2), and one La(1) atom. is represented by the CIF file [CIF]
data_Sr2LaCl7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   13.353
_cell_length_b   7.207
_cell_length_c   12.515
_cell_angle_alpha   88.746
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1204.055
_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
  Sr  Sr0  1  0.550  0.302  0.223  1.0
  Sr  Sr1  1  0.858  0.208  0.221  1.0
  Sr  Sr2  1  0.358  0.792  0.279  1.0
  Sr  Sr3  1  0.050  0.698  0.277  1.0
  Sr  Sr4  1  0.950  0.302  0.723  1.0
  Sr  Sr5  1  0.642  0.208  0.721  1.0
  Sr  Sr6  1  0.142  0.792  0.779  1.0
  Sr  Sr7  1  0.450  0.698  0.777  1.0
  La  La8  1  0.239  0.210  0.029  1.0
  La  La9  1  0.739  0.790  0.471  1.0
  La  La10  1  0.261  0.210  0.529  1.0
  La  La11  1  0.761  0.790  0.971  1.0
  Cl  Cl12  1  0.188  0.847  0.107  1.0
  Cl  Cl13  1  0.419  0.042  0.110  1.0
  Cl  Cl14  1  0.381  0.497  0.119  1.0
  Cl  Cl15  1  0.924  0.871  0.108  1.0
  Cl  Cl16  1  0.061  0.356  0.144  1.0
  Cl  Cl17  1  0.683  0.004  0.139  1.0
  Cl  Cl18  1  0.730  0.510  0.136  1.0
  Cl  Cl19  1  0.230  0.490  0.364  1.0
  Cl  Cl20  1  0.183  0.996  0.361  1.0
  Cl  Cl21  1  0.561  0.644  0.356  1.0
  Cl  Cl22  1  0.424  0.129  0.392  1.0
  Cl  Cl23  1  0.881  0.503  0.381  1.0
  Cl  Cl24  1  0.919  0.958  0.390  1.0
  Cl  Cl25  1  0.688  0.153  0.393  1.0
  Cl  Cl26  1  0.312  0.847  0.607  1.0
  Cl  Cl27  1  0.081  0.042  0.610  1.0
  Cl  Cl28  1  0.119  0.497  0.619  1.0
  Cl  Cl29  1  0.576  0.871  0.608  1.0
  Cl  Cl30  1  0.439  0.356  0.644  1.0
  Cl  Cl31  1  0.817  0.004  0.639  1.0
  Cl  Cl32  1  0.770  0.510  0.636  1.0
  Cl  Cl33  1  0.270  0.490  0.864  1.0
  Cl  Cl34  1  0.317  0.996  0.861  1.0
  Cl  Cl35  1  0.939  0.644  0.856  1.0
  Cl  Cl36  1  0.076  0.129  0.892  1.0
  Cl  Cl37  1  0.619  0.503  0.881  1.0
  Cl  Cl38  1  0.581  0.958  0.890  1.0
  Cl  Cl39  1  0.812  0.153  0.893  1.0
[/CIF]
.