K2ZnH4(O7I2)2 crystallizes in the monoclinic C2 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(6) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms. Zn(1) is bonded in an octahedral geometry to one O(7), one O(8), two equivalent O(3), and two equivalent O(6) atoms. There are two inequivalent H sites. In the first H site, H(1) is bonded in a distorted single-bond geometry to one O(1) and one O(8) atom. In the second H site, H(2) is bonded in a distorted single-bond geometry to one O(5) and one O(7) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one K(2), one H(1), and one I(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one K(1), one K(2), one I(1), and one I(2) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one K(1), one Zn(1), and one I(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one K(1), one K(2), and one I(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one K(2), one H(2), and one I(2) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one K(1), one Zn(1), and one I(2) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Zn(1) and two equivalent H(2) atoms. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Zn(1) and two equivalent H(1) atoms. There are two inequivalent I sites. In the first I site, I(1) is bonded in a 3-coordinate geometry to one O(1), one O(2), and one O(3) atom. In the second I site, I(2) is bonded in a 3-coordinate geometry to one O(2), one O(4), one O(5), and one O(6) atom.
K2ZnH4(O7I2)2 crystallizes in the monoclinic C2 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(6) atoms. Both K(1)-O(2) bond lengths are 2.80 Å. Both K(1)-O(3) bond lengths are 2.91 Å. Both K(1)-O(4) bond lengths are 2.77 Å. Both K(1)-O(6) bond lengths are 3.18 Å. In the second K site, K(2) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms. Both K(2)-O(1) bond lengths are 2.86 Å. Both K(2)-O(2) bond lengths are 2.84 Å. Both K(2)-O(4) bond lengths are 2.82 Å. Both K(2)-O(5) bond lengths are 2.95 Å. Zn(1) is bonded in an octahedral geometry to one O(7), one O(8), two equivalent O(3), and two equivalent O(6) atoms. The Zn(1)-O(7) bond length is 2.03 Å. The Zn(1)-O(8) bond length is 2.07 Å. Both Zn(1)-O(3) bond lengths are 2.25 Å. Both Zn(1)-O(6) bond lengths are 2.18 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a distorted single-bond geometry to one O(1) and one O(8) atom. The H(1)-O(1) bond length is 1.66 Å. The H(1)-O(8) bond length is 1.01 Å. In the second H site, H(2) is bonded in a distorted single-bond geometry to one O(5) and one O(7) atom. The H(2)-O(5) bond length is 1.67 Å. The H(2)-O(7) bond length is 1.01 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one K(2), one H(1), and one I(1) atom. The O(1)-I(1) bond length is 1.85 Å. In the second O site, O(2) is bonded in a 4-coordinate geometry to one K(1), one K(2), one I(1), and one I(2) atom. The O(2)-I(1) bond length is 1.83 Å. The O(2)-I(2) bond length is 2.68 Å. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one K(1), one Zn(1), and one I(1) atom. The O(3)-I(1) bond length is 1.85 Å. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one K(1), one K(2), and one I(2) atom. The O(4)-I(2) bond length is 1.84 Å. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one K(2), one H(2), and one I(2) atom. The O(5)-I(2) bond length is 1.83 Å. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one K(1), one Zn(1), and one I(2) atom. The O(6)-I(2) bond length is 1.86 Å. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Zn(1) and two equivalent H(2) atoms. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Zn(1) and two equivalent H(1) atoms. There are two inequivalent I sites. In the first I site, I(1) is bonded in a 3-coordinate geometry to one O(1), one O(2), and one O(3) atom. In the second I site, I(2) is bonded in a 3-coordinate geometry to one O(2), one O(4), one O(5), and one O(6) atom.