CsIO4 crystallizes in the orthorhombic Pnma space group. Cs(1) is bonded in a 10-coordinate geometry to one O(3), three equivalent O(2), and six equivalent O(1) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to three equivalent Cs(1) and one I(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to three equivalent Cs(1) and one I(1) atom. In the third O site, O(3) is bonded in a distorted linear geometry to one Cs(1) and one I(1) atom. I(1) is bonded in a tetrahedral geometry to one O(2), one O(3), and two equivalent O(1) atoms.
CsIO4 crystallizes in the orthorhombic Pnma space group. Cs(1) is bonded in a 10-coordinate geometry to one O(3), three equivalent O(2), and six equivalent O(1) atoms. The Cs(1)-O(3) bond length is 3.06 Å. There is one shorter (3.18 Å) and two longer (3.27 Å) Cs(1)-O(2) bond lengths. There are a spread of Cs(1)-O(1) bond distances ranging from 3.11-3.61 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to three equivalent Cs(1) and one I(1) atom. The O(1)-I(1) bond length is 1.77 Å. In the second O site, O(2) is bonded in a distorted single-bond geometry to three equivalent Cs(1) and one I(1) atom. The O(2)-I(1) bond length is 1.78 Å. In the third O site, O(3) is bonded in a distorted linear geometry to one Cs(1) and one I(1) atom. The O(3)-I(1) bond length is 1.78 Å. I(1) is bonded in a tetrahedral geometry to one O(2), one O(3), and two equivalent O(1) atoms.