Ba2Cu4Te4O11Cl4 crystallizes in the triclinic P-1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 11-coordinate geometry to one O(10), one O(3), one O(4), one O(5), one O(7), one O(8), two equivalent O(11), two equivalent O(9), and one Cl(2) atom. In the second Ba site, Ba(2) is bonded in a 11-coordinate geometry to one O(10), one O(3), one O(4), one O(5), one O(7), one O(8), two equivalent O(2), two equivalent O(6), and one Cl(3) atom. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one Cl(1), one Cl(3), and two equivalent Cl(4) atoms to form CuCl4 tetrahedra that share corners with two equivalent Cu(2)ClO4 trigonal bipyramids and  an edgeedge with one Cu(1)Cl4 tetrahedra. In the second Cu site, Cu(2) is bonded to one O(10), one O(11), one O(2), one O(5), and one Cl(4) atom to form distorted corner-sharing CuClO4 trigonal bipyramids. In the third Cu site, Cu(3) is bonded in a trigonal planar geometry to one O(1), one Cl(1), and one Cl(2) atom. In the fourth Cu site, Cu(4) is bonded in a 5-coordinate geometry to one O(3), one O(6), one O(7), one O(9), and one Cl(1) atom. There are four inequivalent Te sites. In the first Te site, Te(1) is bonded in a rectangular see-saw-like geometry to one O(1), one O(10), one O(6), and one O(8) atom. In the second Te site, Te(2) is bonded in a distorted T-shaped geometry to one O(11), one O(3), and one O(4) atom. In the third Te site, Te(3) is bonded in a rectangular see-saw-like geometry to one O(1), one O(2), one O(4), and one O(7) atom. In the fourth Te site, Te(4) is bonded in a distorted T-shaped geometry to one O(5), one O(8), and one O(9) atom. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Cu(3), one Te(1), and one Te(3) atom. In the second O site, O(2) is bonded to two equivalent Ba(2), one Cu(2), and one Te(3) atom to form a mixture of distorted corner and edge-sharing OBa2CuTe tetrahedra. In the third O site, O(3) is bonded to one Ba(1), one Ba(2), one Cu(4), and one Te(2) atom to form a mixture of distorted corner and edge-sharing OBa2CuTe tetrahedra. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Te(2), and one Te(3) atom. In the fifth O site, O(5) is bonded to one Ba(1), one Ba(2), one Cu(2), and one Te(4) atom to form a mixture of distorted corner and edge-sharing OBa2CuTe tetrahedra. In the sixth O site, O(6) is bonded to two equivalent Ba(2), one Cu(4), and one Te(1) atom to form a mixture of distorted corner and edge-sharing OBa2CuTe tetrahedra. In the seventh O site, O(7) is bonded to one Ba(1), one Ba(2), one Cu(4), and one Te(3) atom to form a mixture of distorted corner and edge-sharing OBa2CuTe tetrahedra. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Te(1), and one Te(4) atom. In the ninth O site, O(9) is bonded to two equivalent Ba(1), one Cu(4), and one Te(4) atom to form a mixture of distorted corner and edge-sharing OBa2CuTe tetrahedra. In the tenth O site, O(10) is bonded to one Ba(1), one Ba(2), one Cu(2), and one Te(1) atom to form a mixture of distorted corner and edge-sharing OBa2CuTe tetrahedra. In the eleventh O site, O(11) is bonded to two equivalent Ba(1), one Cu(2), and one Te(2) atom to form a mixture of distorted corner and edge-sharing OBa2CuTe tetrahedra. There are four inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a distorted T-shaped geometry to one Cu(1), one Cu(3), and one Cu(4) atom. In the second Cl site, Cl(2) is bonded in a distorted single-bond geometry to one Ba(1) and one Cu(3) atom. In the third Cl site, Cl(3) is bonded in a distorted single-bond geometry to one Ba(2) and one Cu(1) atom. In the fourth Cl site, Cl(4) is bonded in a 3-coordinate geometry to one Cu(2) and two equivalent Cu(1) atoms.
Ba2Cu4Te4O11Cl4 crystallizes in the triclinic P-1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 11-coordinate geometry to one O(10), one O(3), one O(4), one O(5), one O(7), one O(8), two equivalent O(11), two equivalent O(9), and one Cl(2) atom. The Ba(1)-O(10) bond length is 2.91 Å. The Ba(1)-O(3) bond length is 2.94 Å. The Ba(1)-O(4) bond length is 2.96 Å. The Ba(1)-O(5) bond length is 2.93 Å. The Ba(1)-O(7) bond length is 2.91 Å. The Ba(1)-O(8) bond length is 2.95 Å. There is one shorter (2.92 Å) and one longer (2.95 Å) Ba(1)-O(11) bond length. There is one shorter (2.90 Å) and one longer (2.93 Å) Ba(1)-O(9) bond length. The Ba(1)-Cl(2) bond length is 3.32 Å. In the second Ba site, Ba(2) is bonded in a 11-coordinate geometry to one O(10), one O(3), one O(4), one O(5), one O(7), one O(8), two equivalent O(2), two equivalent O(6), and one Cl(3) atom. The Ba(2)-O(10) bond length is 2.99 Å. The Ba(2)-O(3) bond length is 2.90 Å. The Ba(2)-O(4) bond length is 2.99 Å. The Ba(2)-O(5) bond length is 2.89 Å. The Ba(2)-O(7) bond length is 3.00 Å. The Ba(2)-O(8) bond length is 2.98 Å. There is one shorter (2.95 Å) and one longer (2.96 Å) Ba(2)-O(2) bond length. There is one shorter (2.95 Å) and one longer (2.96 Å) Ba(2)-O(6) bond length. The Ba(2)-Cl(3) bond length is 3.28 Å. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one Cl(1), one Cl(3), and two equivalent Cl(4) atoms to form CuCl4 tetrahedra that share corners with two equivalent Cu(2)ClO4 trigonal bipyramids and  an edgeedge with one Cu(1)Cl4 tetrahedra. The Cu(1)-Cl(1) bond length is 2.33 Å. The Cu(1)-Cl(3) bond length is 2.29 Å. There is one shorter (2.36 Å) and one longer (2.37 Å) Cu(1)-Cl(4) bond length. In the second Cu site, Cu(2) is bonded to one O(10), one O(11), one O(2), one O(5), and one Cl(4) atom to form distorted corner-sharing CuClO4 trigonal bipyramids. The Cu(2)-O(10) bond length is 1.99 Å. The Cu(2)-O(11) bond length is 1.99 Å. The Cu(2)-O(2) bond length is 1.99 Å. The Cu(2)-O(5) bond length is 2.00 Å. The Cu(2)-Cl(4) bond length is 2.81 Å. In the third Cu site, Cu(3) is bonded in a trigonal planar geometry to one O(1), one Cl(1), and one Cl(2) atom. The Cu(3)-O(1) bond length is 2.01 Å. The Cu(3)-Cl(1) bond length is 2.28 Å. The Cu(3)-Cl(2) bond length is 2.20 Å. In the fourth Cu site, Cu(4) is bonded in a 5-coordinate geometry to one O(3), one O(6), one O(7), one O(9), and one Cl(1) atom. The Cu(4)-O(3) bond length is 1.99 Å. The Cu(4)-O(6) bond length is 1.99 Å. The Cu(4)-O(7) bond length is 1.98 Å. The Cu(4)-O(9) bond length is 2.00 Å. The Cu(4)-Cl(1) bond length is 2.83 Å. There are four inequivalent Te sites. In the first Te site, Te(1) is bonded in a rectangular see-saw-like geometry to one O(1), one O(10), one O(6), and one O(8) atom. The Te(1)-O(1) bond length is 2.07 Å. The Te(1)-O(10) bond length is 1.91 Å. The Te(1)-O(6) bond length is 1.91 Å. The Te(1)-O(8) bond length is 2.27 Å. In the second Te site, Te(2) is bonded in a distorted T-shaped geometry to one O(11), one O(3), and one O(4) atom. The Te(2)-O(11) bond length is 1.90 Å. The Te(2)-O(3) bond length is 1.90 Å. The Te(2)-O(4) bond length is 1.93 Å. In the third Te site, Te(3) is bonded in a rectangular see-saw-like geometry to one O(1), one O(2), one O(4), and one O(7) atom. The Te(3)-O(1) bond length is 2.06 Å. The Te(3)-O(2) bond length is 1.91 Å. The Te(3)-O(4) bond length is 2.27 Å. The Te(3)-O(7) bond length is 1.90 Å. In the fourth Te site, Te(4) is bonded in a distorted T-shaped geometry to one O(5), one O(8), and one O(9) atom. The Te(4)-O(5) bond length is 1.90 Å. The Te(4)-O(8) bond length is 1.93 Å. The Te(4)-O(9) bond length is 1.90 Å. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Cu(3), one Te(1), and one Te(3) atom. In the second O site, O(2) is bonded to two equivalent Ba(2), one Cu(2), and one Te(3) atom to form a mixture of distorted corner and edge-sharing OBa2CuTe tetrahedra. In the third O site, O(3) is bonded to one Ba(1), one Ba(2), one Cu(4), and one Te(2) atom to form a mixture of distorted corner and edge-sharing OBa2CuTe tetrahedra. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Te(2), and one Te(3) atom. In the fifth O site, O(5) is bonded to one Ba(1), one Ba(2), one Cu(2), and one Te(4) atom to form a mixture of distorted corner and edge-sharing OBa2CuTe tetrahedra. In the sixth O site, O(6) is bonded to two equivalent Ba(2), one Cu(4), and one Te(1) atom to form a mixture of distorted corner and edge-sharing OBa2CuTe tetrahedra. In the seventh O site, O(7) is bonded to one Ba(1), one Ba(2), one Cu(4), and one Te(3) atom to form a mixture of distorted corner and edge-sharing OBa2CuTe tetrahedra. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Te(1), and one Te(4) atom. In the ninth O site, O(9) is bonded to two equivalent Ba(1), one Cu(4), and one Te(4) atom to form a mixture of distorted corner and edge-sharing OBa2CuTe tetrahedra. In the tenth O site, O(10) is bonded to one Ba(1), one Ba(2), one Cu(2), and one Te(1) atom to form a mixture of distorted corner and edge-sharing OBa2CuTe tetrahedra. In the eleventh O site, O(11) is bonded to two equivalent Ba(1), one Cu(2), and one Te(2) atom to form a mixture of distorted corner and edge-sharing OBa2CuTe tetrahedra. There are four inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a distorted T-shaped geometry to one Cu(1), one Cu(3), and one Cu(4) atom. In the second Cl site, Cl(2) is bonded in a distorted single-bond geometry to one Ba(1) and one Cu(3) atom. In the third Cl site, Cl(3) is bonded in a distorted single-bond geometry to one Ba(2) and one Cu(1) atom. In the fourth Cl site, Cl(4) is bonded in a 3-coordinate geometry to one Cu(2) and two equivalent Cu(1) atoms.