Ni(IO3)2 crystallizes in the orthorhombic P2_12_12_1 space group. Ni(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Ni(1) and one I(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Ni(1) and one I(2) atom. In the third O site, O(3) is bonded in a distorted water-like geometry to one Ni(1) and two equivalent I(2) atoms. In the fourth O site, O(4) is bonded in a water-like geometry to one Ni(1) and one I(1) atom. In the fifth O site, O(5) is bonded in a distorted water-like geometry to one Ni(1) and one I(2) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Ni(1) and two equivalent I(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(4), and two equivalent O(6) atoms. In the second I site, I(2) is bonded in a 3-coordinate geometry to one O(2), one O(5), and two equivalent O(3) atoms.
Ni(IO3)2 crystallizes in the orthorhombic P2_12_12_1 space group. Ni(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. The Ni(1)-O(1) bond length is 2.52 Å. The Ni(1)-O(2) bond length is 2.06 Å. The Ni(1)-O(3) bond length is 2.14 Å. The Ni(1)-O(4) bond length is 2.08 Å. The Ni(1)-O(5) bond length is 2.19 Å. The Ni(1)-O(6) bond length is 2.08 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Ni(1) and one I(1) atom. The O(1)-I(1) bond length is 1.89 Å. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Ni(1) and one I(2) atom. The O(2)-I(2) bond length is 1.86 Å. In the third O site, O(3) is bonded in a distorted water-like geometry to one Ni(1) and two equivalent I(2) atoms. There is one shorter (1.86 Å) and one longer (2.67 Å) O(3)-I(2) bond length. In the fourth O site, O(4) is bonded in a water-like geometry to one Ni(1) and one I(1) atom. The O(4)-I(1) bond length is 1.84 Å. In the fifth O site, O(5) is bonded in a distorted water-like geometry to one Ni(1) and one I(2) atom. The O(5)-I(2) bond length is 1.86 Å. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Ni(1) and two equivalent I(1) atoms. There is one shorter (1.88 Å) and one longer (2.63 Å) O(6)-I(1) bond length. 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(4), and two equivalent O(6) atoms. In the second I site, I(2) is bonded in a 3-coordinate geometry to one O(2), one O(5), and two equivalent O(3) atoms.