Sr2LaI7 crystallizes in the monoclinic P2_1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to one I(1), one I(11), one I(14), one I(3), one I(8), and one I(9) atom. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one I(10), one I(13), one I(3), one I(4), one I(6), one I(7), and one I(9) atom. In the third Sr site, Sr(3) is bonded in a 7-coordinate geometry to one I(10), one I(14), one I(2), one I(4), one I(6), one I(8), and one I(9) atom. In the fourth Sr site, Sr(4) is bonded in a 6-coordinate geometry to one I(10), one I(11), one I(12), one I(13), one I(5), and one I(7) atom. There are two inequivalent La sites. In the first La site, La(1) is bonded in an octahedral geometry to one I(11), one I(13), one I(3), one I(5), one I(6), and one I(7) atom. In the second La site, La(2) is bonded in an octahedral geometry to one I(1), one I(12), one I(14), one I(2), one I(4), and one I(8) atom. There are fourteen inequivalent I sites. In the first I site, I(1) is bonded in a water-like geometry to one Sr(1) and one La(2) atom. In the second I site, I(2) is bonded in an L-shaped geometry to one Sr(3) and one La(2) atom. In the third I site, I(3) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), and one La(1) atom. In the fourth I site, I(4) is bonded in a trigonal planar geometry to one Sr(2), one Sr(3), and one La(2) atom. In the fifth I site, I(5) is bonded in a bent 120 degrees geometry to one Sr(4) and one La(1) atom. In the sixth I site, I(6) is bonded in a distorted trigonal non-coplanar geometry to one Sr(2), one Sr(3), and one La(1) atom. In the seventh I site, I(7) is bonded in a distorted T-shaped geometry to one Sr(2), one Sr(4), and one La(1) atom. In the eighth I site, I(8) is bonded in a distorted trigonal non-coplanar geometry to one Sr(1), one Sr(3), and one La(2) atom. In the ninth I site, I(9) is bonded in a trigonal non-coplanar geometry to one Sr(1), one Sr(2), and one Sr(3) atom. In the tenth I site, I(10) is bonded in a T-shaped geometry to one Sr(2), one Sr(3), and one Sr(4) atom. In the eleventh I site, I(11) is bonded in a distorted trigonal non-coplanar geometry to one Sr(1), one Sr(4), and one La(1) atom. In the twelfth I site, I(12) is bonded in a bent 120 degrees geometry to one Sr(4) and one La(2) atom. In the thirteenth I site, I(13) is bonded in a distorted T-shaped geometry to one Sr(2), one Sr(4), and one La(1) atom. In the fourteenth I site, I(14) is bonded in a distorted trigonal non-coplanar geometry to one Sr(1), one Sr(3), and one La(2) atom.
Sr2LaI7 crystallizes in the monoclinic P2_1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to one I(1), one I(11), one I(14), one I(3), one I(8), and one I(9) atom. The Sr(1)-I(1) bond length is 3.30 Å. The Sr(1)-I(11) bond length is 3.39 Å. The Sr(1)-I(14) bond length is 3.84 Å. The Sr(1)-I(3) bond length is 3.70 Å. The Sr(1)-I(8) bond length is 3.38 Å. The Sr(1)-I(9) bond length is 3.40 Å. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one I(10), one I(13), one I(3), one I(4), one I(6), one I(7), and one I(9) atom. The Sr(2)-I(10) bond length is 3.39 Å. The Sr(2)-I(13) bond length is 3.52 Å. The Sr(2)-I(3) bond length is 3.63 Å. The Sr(2)-I(4) bond length is 3.42 Å. The Sr(2)-I(6) bond length is 3.49 Å. The Sr(2)-I(7) bond length is 3.36 Å. The Sr(2)-I(9) bond length is 3.32 Å. In the third Sr site, Sr(3) is bonded in a 7-coordinate geometry to one I(10), one I(14), one I(2), one I(4), one I(6), one I(8), and one I(9) atom. The Sr(3)-I(10) bond length is 3.33 Å. The Sr(3)-I(14) bond length is 3.40 Å. The Sr(3)-I(2) bond length is 3.57 Å. The Sr(3)-I(4) bond length is 3.45 Å. The Sr(3)-I(6) bond length is 3.48 Å. The Sr(3)-I(8) bond length is 3.33 Å. The Sr(3)-I(9) bond length is 3.51 Å. In the fourth Sr site, Sr(4) is bonded in a 6-coordinate geometry to one I(10), one I(11), one I(12), one I(13), one I(5), and one I(7) atom. The Sr(4)-I(10) bond length is 3.39 Å. The Sr(4)-I(11) bond length is 3.59 Å. The Sr(4)-I(12) bond length is 3.23 Å. The Sr(4)-I(13) bond length is 3.30 Å. The Sr(4)-I(5) bond length is 3.38 Å. The Sr(4)-I(7) bond length is 3.54 Å. There are two inequivalent La sites. In the first La site, La(1) is bonded in an octahedral geometry to one I(11), one I(13), one I(3), one I(5), one I(6), and one I(7) atom. The La(1)-I(11) bond length is 3.18 Å. The La(1)-I(13) bond length is 3.24 Å. The La(1)-I(3) bond length is 3.12 Å. The La(1)-I(5) bond length is 3.12 Å. The La(1)-I(6) bond length is 3.18 Å. The La(1)-I(7) bond length is 3.19 Å. In the second La site, La(2) is bonded in an octahedral geometry to one I(1), one I(12), one I(14), one I(2), one I(4), and one I(8) atom. The La(2)-I(1) bond length is 3.12 Å. The La(2)-I(12) bond length is 3.13 Å. The La(2)-I(14) bond length is 3.18 Å. The La(2)-I(2) bond length is 3.10 Å. The La(2)-I(4) bond length is 3.19 Å. The La(2)-I(8) bond length is 3.26 Å. There are fourteen inequivalent I sites. In the first I site, I(1) is bonded in a water-like geometry to one Sr(1) and one La(2) atom. In the second I site, I(2) is bonded in an L-shaped geometry to one Sr(3) and one La(2) atom. In the third I site, I(3) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), and one La(1) atom. In the fourth I site, I(4) is bonded in a trigonal planar geometry to one Sr(2), one Sr(3), and one La(2) atom. In the fifth I site, I(5) is bonded in a bent 120 degrees geometry to one Sr(4) and one La(1) atom. In the sixth I site, I(6) is bonded in a distorted trigonal non-coplanar geometry to one Sr(2), one Sr(3), and one La(1) atom. In the seventh I site, I(7) is bonded in a distorted T-shaped geometry to one Sr(2), one Sr(4), and one La(1) atom. In the eighth I site, I(8) is bonded in a distorted trigonal non-coplanar geometry to one Sr(1), one Sr(3), and one La(2) atom. In the ninth I site, I(9) is bonded in a trigonal non-coplanar geometry to one Sr(1), one Sr(2), and one Sr(3) atom. In the tenth I site, I(10) is bonded in a T-shaped geometry to one Sr(2), one Sr(3), and one Sr(4) atom. In the eleventh I site, I(11) is bonded in a distorted trigonal non-coplanar geometry to one Sr(1), one Sr(4), and one La(1) atom. In the twelfth I site, I(12) is bonded in a bent 120 degrees geometry to one Sr(4) and one La(2) atom. In the thirteenth I site, I(13) is bonded in a distorted T-shaped geometry to one Sr(2), one Sr(4), and one La(1) atom. In the fourteenth I site, I(14) is bonded in a distorted trigonal non-coplanar geometry to one Sr(1), one Sr(3), and one La(2) atom.