KNp(CO3)2 crystallizes in the monoclinic C2/m space group. K(1) is bonded to two equivalent O(3) and four equivalent O(1) atoms to form edge-sharing KO6 octahedra. Np(1) is bonded in a distorted linear geometry to two equivalent O(1) and four equivalent O(2) atoms. C(1) is bonded in a bent 120 degrees geometry to one O(2) and one O(3) atom. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent K(1) and one Np(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Np(1) and one C(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one K(1) and one C(1) atom.
KNp(CO3)2 crystallizes in the monoclinic C2/m space group. K(1) is bonded to two equivalent O(3) and four equivalent O(1) atoms to form edge-sharing KO6 octahedra. Both K(1)-O(3) bond lengths are 2.90 Å. All K(1)-O(1) bond lengths are 2.88 Å. Np(1) is bonded in a distorted linear geometry to two equivalent O(1) and four equivalent O(2) atoms. Both Np(1)-O(1) bond lengths are 1.84 Å. There are two shorter (2.51 Å) and two longer (2.57 Å) Np(1)-O(2) bond lengths. C(1) is bonded in a bent 120 degrees geometry to one O(2) and one O(3) atom. The C(1)-O(2) bond length is 1.27 Å. The C(1)-O(3) bond length is 1.25 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent K(1) and one Np(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Np(1) and one C(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one K(1) and one C(1) atom.