Np(O3I)2 crystallizes in the tetragonal P4_2/n space group. Np(1) is bonded in an octahedral geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Np(1) and one I(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Np(1) and one I(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Np(1) and one I(1) atom. I(1) is bonded in a T-shaped geometry to one O(1), one O(2), and one O(3) atom.
Np(O3I)2 crystallizes in the tetragonal P4_2/n space group. Np(1) is bonded in an octahedral geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Both Np(1)-O(1) bond lengths are 2.24 Å. Both Np(1)-O(2) bond lengths are 1.89 Å. Both Np(1)-O(3) bond lengths are 2.18 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Np(1) and one I(1) atom. The O(1)-I(1) bond length is 1.88 Å. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Np(1) and one I(1) atom. The O(2)-I(1) bond length is 2.47 Å. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Np(1) and one I(1) atom. The O(3)-I(1) bond length is 1.95 Å. I(1) is bonded in a T-shaped geometry to one O(1), one O(2), and one O(3) atom.