La2Mo2O9 crystallizes in the triclinic P1 space group. There are four inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(15), one O(18), one O(2), one O(4), one O(5), and one O(8) atom. In the second La site, La(2) is bonded in a 10-coordinate geometry to one O(1), one O(11), one O(12), one O(14), one O(3), one O(4), one O(5), one O(6), one O(7), and one O(9) atom. In the third La site, La(3) is bonded in a 9-coordinate geometry to one O(10), one O(12), one O(13), one O(14), one O(15), one O(16), one O(18), one O(5), and one O(7) atom. In the fourth La site, La(4) is bonded in a 9-coordinate geometry to one O(11), one O(13), one O(14), one O(15), one O(16), one O(17), one O(2), one O(3), and one O(4) atom. There are four inequivalent Mo sites. In the first Mo site, Mo(1) is bonded in a trigonal bipyramidal geometry to one O(18), one O(2), one O(3), one O(5), and one O(7) atom. In the second Mo site, Mo(2) is bonded in a tetrahedral geometry to one O(11), one O(4), one O(6), and one O(8) atom. In the third Mo site, Mo(3) is bonded in a trigonal bipyramidal geometry to one O(10), one O(13), one O(15), one O(17), and one O(9) atom. In the fourth Mo site, Mo(4) is bonded in a tetrahedral geometry to one O(1), one O(12), one O(14), and one O(16) atom. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one La(1), one La(2), and one Mo(4) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to one La(1), one La(4), and one Mo(1) atom. In the third O site, O(3) is bonded in a trigonal non-coplanar geometry to one La(2), one La(4), and one Mo(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one La(1), one La(2), one La(4), and one Mo(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one La(1), one La(2), one La(3), and one Mo(1) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one La(2) and one Mo(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one La(2), one La(3), and one Mo(1) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one La(1) and one Mo(2) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one La(2) and one Mo(3) atom. In the tenth O site, O(10) is bonded in a trigonal planar geometry to one La(1), one La(3), and one Mo(3) atom. In the eleventh O site, O(11) is bonded in a 2-coordinate geometry to one La(2), one La(4), and one Mo(2) atom. In the twelfth O site, O(12) is bonded in a distorted bent 150 degrees geometry to one La(2), one La(3), and one Mo(4) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one La(3), one La(4), and one Mo(3) atom. In the fourteenth O site, O(14) is bonded in a 2-coordinate geometry to one La(2), one La(3), one La(4), and one Mo(4) atom. In the fifteenth O site, O(15) is bonded in a distorted tetrahedral geometry to one La(1), one La(3), one La(4), and one Mo(3) atom. In the sixteenth O site, O(16) is bonded in a 3-coordinate geometry to one La(3), one La(4), and one Mo(4) atom. In the seventeenth O site, O(17) is bonded in a distorted single-bond geometry to one La(4) and one Mo(3) atom. In the eighteenth O site, O(18) is bonded in a 3-coordinate geometry to one La(1), one La(3), and one Mo(1) atom.
La2Mo2O9 crystallizes in the triclinic P1 space group. There are four inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(15), one O(18), one O(2), one O(4), one O(5), and one O(8) atom. The La(1)-O(1) bond length is 2.72 Å. The La(1)-O(10) bond length is 2.35 Å. The La(1)-O(15) bond length is 2.85 Å. The La(1)-O(18) bond length is 2.62 Å. The La(1)-O(2) bond length is 2.65 Å. The La(1)-O(4) bond length is 2.88 Å. The La(1)-O(5) bond length is 2.74 Å. The La(1)-O(8) bond length is 2.40 Å. In the second La site, La(2) is bonded in a 10-coordinate geometry to one O(1), one O(11), one O(12), one O(14), one O(3), one O(4), one O(5), one O(6), one O(7), and one O(9) atom. The La(2)-O(1) bond length is 2.58 Å. The La(2)-O(11) bond length is 3.07 Å. The La(2)-O(12) bond length is 3.05 Å. The La(2)-O(14) bond length is 3.08 Å. The La(2)-O(3) bond length is 2.44 Å. The La(2)-O(4) bond length is 2.92 Å. The La(2)-O(5) bond length is 2.68 Å. The La(2)-O(6) bond length is 2.47 Å. The La(2)-O(7) bond length is 2.44 Å. The La(2)-O(9) bond length is 2.37 Å. In the third La site, La(3) is bonded in a 9-coordinate geometry to one O(10), one O(12), one O(13), one O(14), one O(15), one O(16), one O(18), one O(5), and one O(7) atom. The La(3)-O(10) bond length is 2.43 Å. The La(3)-O(12) bond length is 2.43 Å. The La(3)-O(13) bond length is 2.58 Å. The La(3)-O(14) bond length is 3.09 Å. The La(3)-O(15) bond length is 2.57 Å. The La(3)-O(16) bond length is 2.89 Å. The La(3)-O(18) bond length is 2.58 Å. The La(3)-O(5) bond length is 2.63 Å. The La(3)-O(7) bond length is 2.44 Å. In the fourth La site, La(4) is bonded in a 9-coordinate geometry to one O(11), one O(13), one O(14), one O(15), one O(16), one O(17), one O(2), one O(3), and one O(4) atom. The La(4)-O(11) bond length is 2.51 Å. The La(4)-O(13) bond length is 2.55 Å. The La(4)-O(14) bond length is 2.48 Å. The La(4)-O(15) bond length is 2.43 Å. The La(4)-O(16) bond length is 2.52 Å. The La(4)-O(17) bond length is 2.84 Å. The La(4)-O(2) bond length is 3.05 Å. The La(4)-O(3) bond length is 2.43 Å. The La(4)-O(4) bond length is 2.69 Å. There are four inequivalent Mo sites. In the first Mo site, Mo(1) is bonded in a trigonal bipyramidal geometry to one O(18), one O(2), one O(3), one O(5), and one O(7) atom. The Mo(1)-O(18) bond length is 1.85 Å. The Mo(1)-O(2) bond length is 1.80 Å. The Mo(1)-O(3) bond length is 1.98 Å. The Mo(1)-O(5) bond length is 1.91 Å. The Mo(1)-O(7) bond length is 1.92 Å. In the second Mo site, Mo(2) is bonded in a tetrahedral geometry to one O(11), one O(4), one O(6), and one O(8) atom. The Mo(2)-O(11) bond length is 1.78 Å. The Mo(2)-O(4) bond length is 1.82 Å. The Mo(2)-O(6) bond length is 1.78 Å. The Mo(2)-O(8) bond length is 1.78 Å. In the third Mo site, Mo(3) is bonded in a trigonal bipyramidal geometry to one O(10), one O(13), one O(15), one O(17), and one O(9) atom. The Mo(3)-O(10) bond length is 1.94 Å. The Mo(3)-O(13) bond length is 1.85 Å. The Mo(3)-O(15) bond length is 2.02 Å. The Mo(3)-O(17) bond length is 1.79 Å. The Mo(3)-O(9) bond length is 1.87 Å. In the fourth Mo site, Mo(4) is bonded in a tetrahedral geometry to one O(1), one O(12), one O(14), and one O(16) atom. The Mo(4)-O(1) bond length is 1.81 Å. The Mo(4)-O(12) bond length is 1.78 Å. The Mo(4)-O(14) bond length is 1.79 Å. The Mo(4)-O(16) bond length is 1.80 Å. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one La(1), one La(2), and one Mo(4) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to one La(1), one La(4), and one Mo(1) atom. In the third O site, O(3) is bonded in a trigonal non-coplanar geometry to one La(2), one La(4), and one Mo(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one La(1), one La(2), one La(4), and one Mo(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one La(1), one La(2), one La(3), and one Mo(1) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one La(2) and one Mo(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one La(2), one La(3), and one Mo(1) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one La(1) and one Mo(2) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one La(2) and one Mo(3) atom. In the tenth O site, O(10) is bonded in a trigonal planar geometry to one La(1), one La(3), and one Mo(3) atom. In the eleventh O site, O(11) is bonded in a 2-coordinate geometry to one La(2), one La(4), and one Mo(2) atom. In the twelfth O site, O(12) is bonded in a distorted bent 150 degrees geometry to one La(2), one La(3), and one Mo(4) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one La(3), one La(4), and one Mo(3) atom. In the fourteenth O site, O(14) is bonded in a 2-coordinate geometry to one La(2), one La(3), one La(4), and one Mo(4) atom. In the fifteenth O site, O(15) is bonded in a distorted tetrahedral geometry to one La(1), one La(3), one La(4), and one Mo(3) atom. In the sixteenth O site, O(16) is bonded in a 3-coordinate geometry to one La(3), one La(4), and one Mo(4) atom. In the seventeenth O site, O(17) is bonded in a distorted single-bond geometry to one La(4) and one Mo(3) atom. In the eighteenth O site, O(18) is bonded in a 3-coordinate geometry to one La(1), one La(3), and one Mo(1) atom.