Te2V2O9 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent V sites. In the first V site, V(1) is bonded in a 6-coordinate geometry to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(9) atom. In the second V site, V(2) is bonded in a distorted trigonal bipyramidal geometry to one O(1), one O(2), one O(5), one O(7), and one O(8) atom. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded in a 3-coordinate geometry to one O(2), one O(6), one O(8), and one O(9) atom. In the second Te site, Te(2) is bonded in a 6-coordinate geometry to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(9) atom. There are nine inequivalent O sites. In the first O site, O(5) is bonded in a trigonal planar geometry to one V(1), one V(2), and one Te(2) atom. In the second O site, O(6) is bonded in a 3-coordinate geometry to one V(1), one Te(1), and one Te(2) atom. In the third O site, O(7) is bonded in a 3-coordinate geometry to one V(1), one V(2), and one Te(2) atom. In the fourth O site, O(8) is bonded in a bent 120 degrees geometry to one V(2) and one Te(1) atom. In the fifth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one V(1), one Te(1), and one Te(2) atom. In the sixth O site, O(1) is bonded in a single-bond geometry to one V(2) atom. In the seventh O site, O(2) is bonded in a distorted bent 120 degrees geometry to one V(2) and one Te(1) atom. In the eighth O site, O(3) is bonded in a single-bond geometry to one V(1) and one Te(2) atom. In the ninth O site, O(4) is bonded in a distorted single-bond geometry to one V(1) and one Te(2) atom.
Te2V2O9 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent V sites. In the first V site, V(1) is bonded in a 6-coordinate geometry to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(9) atom. The V(1)-O(3) bond length is 1.62 Å. The V(1)-O(4) bond length is 1.74 Å. The V(1)-O(5) bond length is 1.95 Å. The V(1)-O(6) bond length is 1.97 Å. The V(1)-O(7) bond length is 2.33 Å. The V(1)-O(9) bond length is 1.98 Å. In the second V site, V(2) is bonded in a distorted trigonal bipyramidal geometry to one O(1), one O(2), one O(5), one O(7), and one O(8) atom. The V(2)-O(1) bond length is 1.60 Å. The V(2)-O(2) bond length is 1.87 Å. The V(2)-O(5) bond length is 2.00 Å. The V(2)-O(7) bond length is 1.89 Å. The V(2)-O(8) bond length is 1.80 Å. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded in a 3-coordinate geometry to one O(2), one O(6), one O(8), and one O(9) atom. The Te(1)-O(2) bond length is 1.91 Å. The Te(1)-O(6) bond length is 2.44 Å. The Te(1)-O(8) bond length is 1.96 Å. The Te(1)-O(9) bond length is 1.88 Å. In the second Te site, Te(2) is bonded in a 6-coordinate geometry to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(9) atom. The Te(2)-O(3) bond length is 2.60 Å. The Te(2)-O(4) bond length is 2.28 Å. The Te(2)-O(5) bond length is 2.01 Å. The Te(2)-O(6) bond length is 1.91 Å. The Te(2)-O(7) bond length is 1.92 Å. The Te(2)-O(9) bond length is 2.48 Å. There are nine inequivalent O sites. In the first O site, O(5) is bonded in a trigonal planar geometry to one V(1), one V(2), and one Te(2) atom. In the second O site, O(6) is bonded in a 3-coordinate geometry to one V(1), one Te(1), and one Te(2) atom. In the third O site, O(7) is bonded in a 3-coordinate geometry to one V(1), one V(2), and one Te(2) atom. In the fourth O site, O(8) is bonded in a bent 120 degrees geometry to one V(2) and one Te(1) atom. In the fifth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one V(1), one Te(1), and one Te(2) atom. In the sixth O site, O(1) is bonded in a single-bond geometry to one V(2) atom. In the seventh O site, O(2) is bonded in a distorted bent 120 degrees geometry to one V(2) and one Te(1) atom. In the eighth O site, O(3) is bonded in a single-bond geometry to one V(1) and one Te(2) atom. In the ninth O site, O(4) is bonded in a distorted single-bond geometry to one V(1) and one Te(2) atom.