Sr2LaCl7 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one Cl(1), two equivalent Cl(3), two equivalent Cl(4), and two equivalent Cl(5) atoms to form SrCl7 pentagonal bipyramids that share corners with three equivalent La(1)Cl6 octahedra, corners with two equivalent Sr(1)Cl7 pentagonal bipyramids, and  an edgeedge with one La(1)Cl6 octahedra. The corner-sharing octahedral tilt angles range from 39-54°. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one Cl(1), one Cl(2), one Cl(3), two equivalent Cl(4), and two equivalent Cl(5) atoms. La(1) is bonded to one Cl(1), one Cl(2), two equivalent Cl(4), and two equivalent Cl(5) atoms to form LaCl6 octahedra that share corners with three equivalent Sr(1)Cl7 pentagonal bipyramids and  an edgeedge with one Sr(1)Cl7 pentagonal bipyramid. There are five inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a trigonal planar geometry to one Sr(1), one Sr(2), and one La(1) atom. In the second Cl site, Cl(2) is bonded in a bent 150 degrees geometry to one Sr(2) and one La(1) atom. In the third Cl site, Cl(3) is bonded in a trigonal planar geometry to one Sr(2) and two equivalent Sr(1) atoms. In the fourth Cl site, Cl(4) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), and one La(1) atom. In the fifth Cl site, Cl(5) is bonded in a trigonal planar geometry to one Sr(1), one Sr(2), and one La(1) atom.
Sr2LaCl7 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one Cl(1), two equivalent Cl(3), two equivalent Cl(4), and two equivalent Cl(5) atoms to form SrCl7 pentagonal bipyramids that share corners with three equivalent La(1)Cl6 octahedra, corners with two equivalent Sr(1)Cl7 pentagonal bipyramids, and  an edgeedge with one La(1)Cl6 octahedra. The corner-sharing octahedral tilt angles range from 39-54°. The Sr(1)-Cl(1) bond length is 3.04 Å. There is one shorter (3.01 Å) and one longer (3.05 Å) Sr(1)-Cl(3) bond length. Both Sr(1)-Cl(4) bond lengths are 2.97 Å. Both Sr(1)-Cl(5) bond lengths are 3.05 Å. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one Cl(1), one Cl(2), one Cl(3), two equivalent Cl(4), and two equivalent Cl(5) atoms. The Sr(2)-Cl(1) bond length is 3.00 Å. The Sr(2)-Cl(2) bond length is 2.83 Å. The Sr(2)-Cl(3) bond length is 3.08 Å. Both Sr(2)-Cl(4) bond lengths are 3.45 Å. Both Sr(2)-Cl(5) bond lengths are 2.98 Å. La(1) is bonded to one Cl(1), one Cl(2), two equivalent Cl(4), and two equivalent Cl(5) atoms to form LaCl6 octahedra that share corners with three equivalent Sr(1)Cl7 pentagonal bipyramids and  an edgeedge with one Sr(1)Cl7 pentagonal bipyramid. The La(1)-Cl(1) bond length is 2.85 Å. The La(1)-Cl(2) bond length is 2.72 Å. Both La(1)-Cl(4) bond lengths are 2.73 Å. Both La(1)-Cl(5) bond lengths are 2.80 Å. There are five inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a trigonal planar geometry to one Sr(1), one Sr(2), and one La(1) atom. In the second Cl site, Cl(2) is bonded in a bent 150 degrees geometry to one Sr(2) and one La(1) atom. In the third Cl site, Cl(3) is bonded in a trigonal planar geometry to one Sr(2) and two equivalent Sr(1) atoms. In the fourth Cl site, Cl(4) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), and one La(1) atom. In the fifth Cl site, Cl(5) is bonded in a trigonal planar geometry to one Sr(1), one Sr(2), and one La(1) atom.