Cu2Te3O8 crystallizes in the monoclinic C2/c space group. Cu(1) is bonded to one O(1), one O(3), one O(4), and two equivalent O(2) atoms to form corner-sharing CuO5 trigonal bipyramids. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded in a see-saw-like geometry to two equivalent O(3) and two equivalent O(4) atoms. In the second Te site, Te(2) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(3), and two equivalent O(1) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Cu(1) and two equivalent Te(2) atoms. In the second O site, O(2) is bonded in a trigonal planar geometry to two equivalent Cu(1) and one Te(2) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Cu(1), one Te(1), and one Te(2) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Cu(1) and one Te(1) atom.
Cu2Te3O8 crystallizes in the monoclinic C2/c space group. Cu(1) is bonded to one O(1), one O(3), one O(4), and two equivalent O(2) atoms to form corner-sharing CuO5 trigonal bipyramids. The Cu(1)-O(1) bond length is 2.18 Å. The Cu(1)-O(3) bond length is 1.97 Å. The Cu(1)-O(4) bond length is 1.93 Å. There is one shorter (2.02 Å) and one longer (2.19 Å) Cu(1)-O(2) bond length. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded in a see-saw-like geometry to two equivalent O(3) and two equivalent O(4) atoms. Both Te(1)-O(3) bond lengths are 2.12 Å. Both Te(1)-O(4) bond lengths are 1.91 Å. In the second Te site, Te(2) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(3), and two equivalent O(1) atoms. The Te(2)-O(2) bond length is 1.91 Å. The Te(2)-O(3) bond length is 2.03 Å. There is one shorter (1.95 Å) and one longer (2.22 Å) Te(2)-O(1) bond length. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Cu(1) and two equivalent Te(2) atoms. In the second O site, O(2) is bonded in a trigonal planar geometry to two equivalent Cu(1) and one Te(2) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Cu(1), one Te(1), and one Te(2) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Cu(1) and one Te(1) atom.