H3Fe2(TeO3)4Cl crystallizes in the triclinic P-1 space group. Fe(1) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(5) atoms to form edge-sharing FeO6 octahedra. There are two inequivalent H sites. In the first H site, H(1) is bonded in a distorted linear geometry to one O(3) and one O(4) atom. In the second H site, H(2) is bonded in a linear geometry to two equivalent O(6) atoms. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded in a 3-coordinate geometry to one O(1), one O(2), one O(3), and one Cl(1) atom. In the second Te site, Te(2) is bonded in a 3-coordinate geometry to one O(4), one O(5), one O(6), and one Cl(1) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Fe(1) and one Te(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Fe(1) and one Te(1) atom. In the third O site, O(3) is bonded in a distorted water-like geometry to one H(1) and one Te(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Fe(1), one H(1), and one Te(2) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to two equivalent Fe(1) and one Te(2) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one H(2) and one Te(2) atom. Cl(1) is bonded in a distorted square co-planar geometry to two equivalent Te(1) and two equivalent Te(2) atoms.
H3Fe2(TeO3)4Cl crystallizes in the triclinic P-1 space group. Fe(1) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(5) atoms to form edge-sharing FeO6 octahedra. The Fe(1)-O(1) bond length is 1.98 Å. The Fe(1)-O(4) bond length is 1.97 Å. There is one shorter (2.05 Å) and one longer (2.13 Å) Fe(1)-O(2) bond length. There is one shorter (2.07 Å) and one longer (2.09 Å) Fe(1)-O(5) bond length. There are two inequivalent H sites. In the first H site, H(1) is bonded in a distorted linear geometry to one O(3) and one O(4) atom. The H(1)-O(3) bond length is 1.02 Å. The H(1)-O(4) bond length is 1.60 Å. In the second H site, H(2) is bonded in a linear geometry to two equivalent O(6) atoms. Both H(2)-O(6) bond lengths are 1.21 Å. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded in a 3-coordinate geometry to one O(1), one O(2), one O(3), and one Cl(1) atom. The Te(1)-O(1) bond length is 1.92 Å. The Te(1)-O(2) bond length is 1.96 Å. The Te(1)-O(3) bond length is 1.96 Å. The Te(1)-Cl(1) bond length is 3.14 Å. In the second Te site, Te(2) is bonded in a 3-coordinate geometry to one O(4), one O(5), one O(6), and one Cl(1) atom. The Te(2)-O(4) bond length is 1.92 Å. The Te(2)-O(5) bond length is 1.95 Å. The Te(2)-O(6) bond length is 1.90 Å. The Te(2)-Cl(1) bond length is 3.08 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Fe(1) and one Te(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Fe(1) and one Te(1) atom. In the third O site, O(3) is bonded in a distorted water-like geometry to one H(1) and one Te(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Fe(1), one H(1), and one Te(2) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to two equivalent Fe(1) and one Te(2) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one H(2) and one Te(2) atom. Cl(1) is bonded in a distorted square co-planar geometry to two equivalent Te(1) and two equivalent Te(2) atoms.