NH4H2(IO3)3 crystallizes in the triclinic P1 space group. The structure consists of two ammonium molecules inside a H2(O3I)3 framework. In the H2(O3I)3 framework, there are four inequivalent H sites. In the first H site, H(7) is bonded in a distorted single-bond geometry to one O(3) and one O(7) atom. In the second H site, H(8) is bonded in a single-bond geometry to one O(4) and one O(8) atom. In the third H site, H(11) is bonded in a linear geometry to one O(5) and one O(6) atom. In the fourth H site, H(12) is bonded in a linear geometry to one O(15) and one O(16) atom. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one I(2) and one I(6) atom. In the second O site, O(2) is bonded in a single-bond geometry to one I(5) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one H(7) and one I(6) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one H(8) and one I(5) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one H(11) and one I(6) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one H(11) and one I(5) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one H(7) and one I(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one H(8) and one I(2) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one I(4) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one I(2) and one I(3) atom. In the eleventh O site, O(11) is bonded in a single-bond geometry to one I(1) atom. In the twelfth O site, O(12) is bonded in a single-bond geometry to one I(2) atom. In the thirteenth O site, O(13) is bonded in a single-bond geometry to one I(3) atom. In the fourteenth O site, O(14) is bonded in a distorted single-bond geometry to one I(4) atom. In the fifteenth O site, O(15) is bonded in a distorted single-bond geometry to one H(12) and one I(2) atom. In the sixteenth O site, O(16) is bonded in a bent 120 degrees geometry to one H(12) and one I(1) atom. In the seventeenth O site, O(17) is bonded in a distorted bent 150 degrees geometry to one I(1) and one I(3) atom. In the eighteenth O site, O(18) is bonded in a distorted bent 150 degrees geometry to one I(2) and one I(4) atom. There are six inequivalent I sites. In the first I site, I(1) is bonded in a 3-coordinate geometry to one O(11), one O(16), one O(17), and one O(7) atom. In the second I site, I(2) is bonded in a distorted octahedral geometry to one O(1), one O(10), one O(12), one O(15), one O(18), and one O(8) atom. In the third I site, I(3) is bonded in a distorted trigonal non-coplanar geometry to one O(10), one O(13), and one O(17) atom. In the fourth I site, I(4) is bonded in a distorted trigonal non-coplanar geometry to one O(14), one O(18), and one O(9) atom. In the fifth I site, I(5) is bonded in a 3-coordinate geometry to one O(2), one O(4), and one O(6) atom. In the sixth I site, I(6) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(3), and one O(5) atom.
NH4H2(IO3)3 crystallizes in the triclinic P1 space group. The structure consists of two ammonium molecules inside a H2(O3I)3 framework. In the H2(O3I)3 framework, there are four inequivalent H sites. In the first H site, H(7) is bonded in a distorted single-bond geometry to one O(3) and one O(7) atom. The H(7)-O(3) bond length is 1.68 Å. The H(7)-O(7) bond length is 1.01 Å. In the second H site, H(8) is bonded in a single-bond geometry to one O(4) and one O(8) atom. The H(8)-O(4) bond length is 1.71 Å. The H(8)-O(8) bond length is 1.01 Å. In the third H site, H(11) is bonded in a linear geometry to one O(5) and one O(6) atom. The H(11)-O(5) bond length is 1.55 Å. The H(11)-O(6) bond length is 1.04 Å. In the fourth H site, H(12) is bonded in a linear geometry to one O(15) and one O(16) atom. The H(12)-O(15) bond length is 1.04 Å. The H(12)-O(16) bond length is 1.52 Å. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one I(2) and one I(6) atom. The O(1)-I(2) bond length is 2.52 Å. The O(1)-I(6) bond length is 1.86 Å. In the second O site, O(2) is bonded in a single-bond geometry to one I(5) atom. The O(2)-I(5) bond length is 1.82 Å. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one H(7) and one I(6) atom. The O(3)-I(6) bond length is 1.83 Å. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one H(8) and one I(5) atom. The O(4)-I(5) bond length is 1.82 Å. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one H(11) and one I(6) atom. The O(5)-I(6) bond length is 1.84 Å. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one H(11) and one I(5) atom. The O(6)-I(5) bond length is 1.94 Å. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one H(7) and one I(1) atom. The O(7)-I(1) bond length is 1.92 Å. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one H(8) and one I(2) atom. The O(8)-I(2) bond length is 1.91 Å. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one I(4) atom. The O(9)-I(4) bond length is 1.85 Å. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one I(2) and one I(3) atom. The O(10)-I(2) bond length is 2.61 Å. The O(10)-I(3) bond length is 1.88 Å. In the eleventh O site, O(11) is bonded in a single-bond geometry to one I(1) atom. The O(11)-I(1) bond length is 1.82 Å. In the twelfth O site, O(12) is bonded in a single-bond geometry to one I(2) atom. The O(12)-I(2) bond length is 1.81 Å. In the thirteenth O site, O(13) is bonded in a single-bond geometry to one I(3) atom. The O(13)-I(3) bond length is 1.83 Å. In the fourteenth O site, O(14) is bonded in a distorted single-bond geometry to one I(4) atom. The O(14)-I(4) bond length is 1.84 Å. In the fifteenth O site, O(15) is bonded in a distorted single-bond geometry to one H(12) and one I(2) atom. The O(15)-I(2) bond length is 1.93 Å. In the sixteenth O site, O(16) is bonded in a bent 120 degrees geometry to one H(12) and one I(1) atom. The O(16)-I(1) bond length is 1.84 Å. In the seventeenth O site, O(17) is bonded in a distorted bent 150 degrees geometry to one I(1) and one I(3) atom. The O(17)-I(1) bond length is 2.55 Å. The O(17)-I(3) bond length is 1.82 Å. In the eighteenth O site, O(18) is bonded in a distorted bent 150 degrees geometry to one I(2) and one I(4) atom. The O(18)-I(2) bond length is 2.49 Å. The O(18)-I(4) bond length is 1.83 Å. There are six inequivalent I sites. In the first I site, I(1) is bonded in a 3-coordinate geometry to one O(11), one O(16), one O(17), and one O(7) atom. In the second I site, I(2) is bonded in a distorted octahedral geometry to one O(1), one O(10), one O(12), one O(15), one O(18), and one O(8) atom. In the third I site, I(3) is bonded in a distorted trigonal non-coplanar geometry to one O(10), one O(13), and one O(17) atom. In the fourth I site, I(4) is bonded in a distorted trigonal non-coplanar geometry to one O(14), one O(18), and one O(9) atom. In the fifth I site, I(5) is bonded in a 3-coordinate geometry to one O(2), one O(4), and one O(6) atom. In the sixth I site, I(6) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(3), and one O(5) atom.