La2O19I6 crystallizes in the monoclinic Pc space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a distorted q6 geometry to one O(1), one O(10), one O(11), one O(12), one O(17), one O(4), one O(6), one O(7), and one O(9) atom. In the second La site, La(2) is bonded in a 9-coordinate geometry to one O(13), one O(15), one O(16), one O(18), one O(19), one O(2), one O(3), one O(5), and one O(8) atom. There are nineteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one La(1) and one I(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one La(2) and one I(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one La(2) and one I(1) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one La(1) and one I(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one La(2) and one I(2) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one La(1) and one I(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one La(1), one I(2), and one I(3) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one La(2), one I(3), and one I(6) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one La(1), one I(3), and one I(4) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one La(1), one I(3), and one I(4) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one La(1) and one I(4) atom. In the twelfth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one La(1) and one I(4) atom. In the thirteenth O site, O(13) is bonded in a bent 120 degrees geometry to one La(2) and one I(5) atom. In the fourteenth O site, O(14) is bonded in a single-bond geometry to one I(5) atom. In the fifteenth O site, O(15) is bonded in a bent 150 degrees geometry to one La(2) and one I(5) atom. In the sixteenth O site, O(16) is bonded in a bent 120 degrees geometry to one La(2) and one I(6) atom. In the seventeenth O site, O(17) is bonded in a distorted bent 120 degrees geometry to one La(1) and one I(6) atom. In the eighteenth O site, O(18) is bonded in a distorted bent 150 degrees geometry to one La(2) and one I(6) atom. In the nineteenth O site, O(19) is bonded in a single-bond geometry to one La(2) atom. There are six inequivalent I sites. In the first I site, I(1) is bonded in a 3-coordinate geometry to one O(1), one O(2), and one O(3) atom. In the second I site, I(2) is bonded in a 3-coordinate geometry to one O(4), one O(5), one O(6), and one O(7) atom. In the third I site, I(3) is bonded in a 3-coordinate geometry to one O(10), one O(7), one O(8), and one O(9) atom. In the fourth I site, I(4) is bonded in a 3-coordinate geometry to one O(10), one O(11), one O(12), and one O(9) atom. In the fifth I site, I(5) is bonded in a distorted trigonal non-coplanar geometry to one O(13), one O(14), and one O(15) atom. In the sixth I site, I(6) is bonded in a 3-coordinate geometry to one O(16), one O(17), one O(18), and one O(8) atom.
La2O19I6 crystallizes in the monoclinic Pc space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a distorted q6 geometry to one O(1), one O(10), one O(11), one O(12), one O(17), one O(4), one O(6), one O(7), and one O(9) atom. The La(1)-O(1) bond length is 2.53 Å. The La(1)-O(10) bond length is 2.59 Å. The La(1)-O(11) bond length is 2.57 Å. The La(1)-O(12) bond length is 2.59 Å. The La(1)-O(17) bond length is 2.71 Å. The La(1)-O(4) bond length is 2.54 Å. The La(1)-O(6) bond length is 2.55 Å. The La(1)-O(7) bond length is 2.61 Å. The La(1)-O(9) bond length is 2.68 Å. In the second La site, La(2) is bonded in a 9-coordinate geometry to one O(13), one O(15), one O(16), one O(18), one O(19), one O(2), one O(3), one O(5), and one O(8) atom. The La(2)-O(13) bond length is 2.55 Å. The La(2)-O(15) bond length is 2.57 Å. The La(2)-O(16) bond length is 2.67 Å. The La(2)-O(18) bond length is 2.56 Å. The La(2)-O(19) bond length is 2.64 Å. The La(2)-O(2) bond length is 2.61 Å. The La(2)-O(3) bond length is 2.53 Å. The La(2)-O(5) bond length is 2.49 Å. The La(2)-O(8) bond length is 2.53 Å. There are nineteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one La(1) and one I(1) atom. The O(1)-I(1) bond length is 1.82 Å. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one La(2) and one I(1) atom. The O(2)-I(1) bond length is 1.84 Å. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one La(2) and one I(1) atom. The O(3)-I(1) bond length is 1.84 Å. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one La(1) and one I(2) atom. The O(4)-I(2) bond length is 1.83 Å. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one La(2) and one I(2) atom. The O(5)-I(2) bond length is 1.83 Å. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one La(1) and one I(2) atom. The O(6)-I(2) bond length is 1.84 Å. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one La(1), one I(2), and one I(3) atom. The O(7)-I(2) bond length is 2.70 Å. The O(7)-I(3) bond length is 1.84 Å. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one La(2), one I(3), and one I(6) atom. The O(8)-I(3) bond length is 1.86 Å. The O(8)-I(6) bond length is 2.61 Å. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one La(1), one I(3), and one I(4) atom. The O(9)-I(3) bond length is 1.83 Å. The O(9)-I(4) bond length is 2.55 Å. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one La(1), one I(3), and one I(4) atom. The O(10)-I(3) bond length is 2.48 Å. The O(10)-I(4) bond length is 1.85 Å. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one La(1) and one I(4) atom. The O(11)-I(4) bond length is 1.84 Å. In the twelfth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one La(1) and one I(4) atom. The O(12)-I(4) bond length is 1.85 Å. In the thirteenth O site, O(13) is bonded in a bent 120 degrees geometry to one La(2) and one I(5) atom. The O(13)-I(5) bond length is 1.84 Å. In the fourteenth O site, O(14) is bonded in a single-bond geometry to one I(5) atom. The O(14)-I(5) bond length is 1.82 Å. In the fifteenth O site, O(15) is bonded in a bent 150 degrees geometry to one La(2) and one I(5) atom. The O(15)-I(5) bond length is 1.83 Å. In the sixteenth O site, O(16) is bonded in a bent 120 degrees geometry to one La(2) and one I(6) atom. The O(16)-I(6) bond length is 1.83 Å. In the seventeenth O site, O(17) is bonded in a distorted bent 120 degrees geometry to one La(1) and one I(6) atom. The O(17)-I(6) bond length is 1.83 Å. In the eighteenth O site, O(18) is bonded in a distorted bent 150 degrees geometry to one La(2) and one I(6) atom. The O(18)-I(6) bond length is 1.86 Å. In the nineteenth O site, O(19) is bonded in a single-bond geometry to one La(2) atom. There are six inequivalent I sites. In the first I site, I(1) is bonded in a 3-coordinate geometry to one O(1), one O(2), and one O(3) atom. In the second I site, I(2) is bonded in a 3-coordinate geometry to one O(4), one O(5), one O(6), and one O(7) atom. In the third I site, I(3) is bonded in a 3-coordinate geometry to one O(10), one O(7), one O(8), and one O(9) atom. In the fourth I site, I(4) is bonded in a 3-coordinate geometry to one O(10), one O(11), one O(12), and one O(9) atom. In the fifth I site, I(5) is bonded in a distorted trigonal non-coplanar geometry to one O(13), one O(14), and one O(15) atom. In the sixth I site, I(6) is bonded in a 3-coordinate geometry to one O(16), one O(17), one O(18), and one O(8) atom.