K2CuTeO7 crystallizes in the monoclinic Cc space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(6), two equivalent O(3), and two equivalent O(7) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), and two equivalent O(7) atoms. Cu(1) is bonded in a rectangular see-saw-like geometry to one O(1), one O(2), one O(3), and one O(4) atom. Te(1) is bonded in an octahedral geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one K(1), one K(2), one Cu(1), and one Te(1) atom. In the second O site, O(2) is bonded in a distorted L-shaped geometry to one K(1), one K(2), one Cu(1), and one Te(1) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one K(2), two equivalent K(1), one Cu(1), and one Te(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one K(1), one K(2), one Cu(1), and one Te(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one K(1), one K(2), and one Te(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one K(1), one K(2), and one Te(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to two equivalent K(1) and two equivalent K(2) atoms.
K2CuTeO7 crystallizes in the monoclinic Cc space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(6), two equivalent O(3), and two equivalent O(7) atoms. The K(1)-O(1) bond length is 3.30 Å. The K(1)-O(2) bond length is 2.93 Å. The K(1)-O(4) bond length is 2.84 Å. The K(1)-O(5) bond length is 2.75 Å. The K(1)-O(6) bond length is 3.05 Å. There is one shorter (2.88 Å) and one longer (3.25 Å) K(1)-O(3) bond length. There is one shorter (2.90 Å) and one longer (2.99 Å) K(1)-O(7) bond length. In the second K site, K(2) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), and two equivalent O(7) atoms. The K(2)-O(1) bond length is 2.87 Å. The K(2)-O(2) bond length is 3.08 Å. The K(2)-O(3) bond length is 2.81 Å. The K(2)-O(4) bond length is 2.81 Å. The K(2)-O(5) bond length is 2.86 Å. The K(2)-O(6) bond length is 2.80 Å. There is one shorter (3.10 Å) and one longer (3.30 Å) K(2)-O(7) bond length. Cu(1) is bonded in a rectangular see-saw-like geometry to one O(1), one O(2), one O(3), and one O(4) atom. The Cu(1)-O(1) bond length is 1.85 Å. The Cu(1)-O(2) bond length is 1.86 Å. The Cu(1)-O(3) bond length is 1.85 Å. The Cu(1)-O(4) bond length is 1.85 Å. Te(1) is bonded in an octahedral geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. The Te(1)-O(1) bond length is 1.98 Å. The Te(1)-O(2) bond length is 1.99 Å. The Te(1)-O(3) bond length is 1.98 Å. The Te(1)-O(4) bond length is 1.98 Å. The Te(1)-O(5) bond length is 1.95 Å. The Te(1)-O(6) bond length is 1.92 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one K(1), one K(2), one Cu(1), and one Te(1) atom. In the second O site, O(2) is bonded in a distorted L-shaped geometry to one K(1), one K(2), one Cu(1), and one Te(1) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one K(2), two equivalent K(1), one Cu(1), and one Te(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one K(1), one K(2), one Cu(1), and one Te(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one K(1), one K(2), and one Te(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one K(1), one K(2), and one Te(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to two equivalent K(1) and two equivalent K(2) atoms.