La2W2O9 crystallizes in the triclinic P-1 space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(7), one O(8), one O(9), and two equivalent O(6) atoms. In the second La site, La(2) is bonded in a 10-coordinate geometry to one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), two equivalent O(1), and two equivalent O(9) atoms. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(2), one O(7), one O(8), and one O(9) atom to form corner-sharing WO5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 41-48°. In the second W site, W(2) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), and one O(8) atom to form distorted corner-sharing WO6 octahedra. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to two equivalent La(2) and one W(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one La(1), one W(1), and one W(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one La(1), one La(2), and one W(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one La(1), one La(2), and one W(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one La(1), one La(2), and one W(2) atom. In the sixth O site, O(6) is bonded to one La(2), two equivalent La(1), and one W(2) atom to form a mixture of distorted corner and edge-sharing OLa3W tetrahedra. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one La(1), one La(2), and one W(1) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one La(1), one La(2), one W(1), and one W(2) atom. In the ninth O site, O(9) is bonded to one La(1), two equivalent La(2), and one W(1) atom to form a mixture of distorted corner and edge-sharing OLa3W tetrahedra.
La2W2O9 crystallizes in the triclinic P-1 space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(7), one O(8), one O(9), and two equivalent O(6) atoms. The La(1)-O(2) bond length is 2.49 Å. The La(1)-O(3) bond length is 2.47 Å. The La(1)-O(4) bond length is 2.69 Å. The La(1)-O(5) bond length is 2.50 Å. The La(1)-O(7) bond length is 2.59 Å. The La(1)-O(8) bond length is 2.66 Å. The La(1)-O(9) bond length is 2.54 Å. There is one shorter (2.45 Å) and one longer (2.58 Å) La(1)-O(6) bond length. In the second La site, La(2) is bonded in a 10-coordinate geometry to one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), two equivalent O(1), and two equivalent O(9) atoms. The La(2)-O(3) bond length is 2.62 Å. The La(2)-O(4) bond length is 2.55 Å. The La(2)-O(5) bond length is 2.97 Å. The La(2)-O(6) bond length is 2.54 Å. The La(2)-O(7) bond length is 2.59 Å. The La(2)-O(8) bond length is 2.85 Å. There is one shorter (2.63 Å) and one longer (2.67 Å) La(2)-O(1) bond length. There is one shorter (2.53 Å) and one longer (2.57 Å) La(2)-O(9) bond length. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(2), one O(7), one O(8), and one O(9) atom to form corner-sharing WO5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 41-48°. The W(1)-O(1) bond length is 1.82 Å. The W(1)-O(2) bond length is 1.90 Å. The W(1)-O(7) bond length is 1.82 Å. The W(1)-O(8) bond length is 1.86 Å. The W(1)-O(9) bond length is 1.93 Å. In the second W site, W(2) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), and one O(8) atom to form distorted corner-sharing WO6 octahedra. The W(2)-O(2) bond length is 2.10 Å. The W(2)-O(3) bond length is 1.81 Å. The W(2)-O(4) bond length is 1.80 Å. The W(2)-O(5) bond length is 1.83 Å. The W(2)-O(6) bond length is 1.97 Å. The W(2)-O(8) bond length is 2.21 Å. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to two equivalent La(2) and one W(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one La(1), one W(1), and one W(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one La(1), one La(2), and one W(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one La(1), one La(2), and one W(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one La(1), one La(2), and one W(2) atom. In the sixth O site, O(6) is bonded to one La(2), two equivalent La(1), and one W(2) atom to form a mixture of distorted corner and edge-sharing OLa3W tetrahedra. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one La(1), one La(2), and one W(1) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one La(1), one La(2), one W(1), and one W(2) atom. In the ninth O site, O(9) is bonded to one La(1), two equivalent La(2), and one W(1) atom to form a mixture of distorted corner and edge-sharing OLa3W tetrahedra.