NpCo(N3O4)2 crystallizes in the monoclinic P2_1/c space group. Np(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted NpO6 octahedra that share corners with two equivalent Co(1)N4O2 octahedra. The corner-sharing octahedral tilt angles are 23°. Co(1) is bonded to two equivalent N(1), two equivalent N(2), and two equivalent O(3) atoms to form CoN4O2 octahedra that share corners with two equivalent Np(1)O6 octahedra. The corner-sharing octahedral tilt angles are 23°. There are three inequivalent N sites. In the first N site, N(1) is bonded in a bent 120 degrees geometry to one Co(1) and one O(4) atom. In the second N site, N(2) is bonded in a distorted bent 120 degrees geometry to one Co(1) and one N(3) atom. In the third N site, N(3) is bonded in a linear geometry to one N(2) and one O(2) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one Np(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Np(1) and one N(3) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Np(1) and one Co(1) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one N(1) atom.
NpCo(N3O4)2 crystallizes in the monoclinic P2_1/c space group. Np(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted NpO6 octahedra that share corners with two equivalent Co(1)N4O2 octahedra. The corner-sharing octahedral tilt angles are 23°. Both Np(1)-O(1) bond lengths are 1.83 Å. Both Np(1)-O(2) bond lengths are 2.66 Å. Both Np(1)-O(3) bond lengths are 1.94 Å. Co(1) is bonded to two equivalent N(1), two equivalent N(2), and two equivalent O(3) atoms to form CoN4O2 octahedra that share corners with two equivalent Np(1)O6 octahedra. The corner-sharing octahedral tilt angles are 23°. Both Co(1)-N(1) bond lengths are 1.96 Å. Both Co(1)-N(2) bond lengths are 2.42 Å. Both Co(1)-O(3) bond lengths are 1.95 Å. There are three inequivalent N sites. In the first N site, N(1) is bonded in a bent 120 degrees geometry to one Co(1) and one O(4) atom. The N(1)-O(4) bond length is 1.19 Å. In the second N site, N(2) is bonded in a distorted bent 120 degrees geometry to one Co(1) and one N(3) atom. The N(2)-N(3) bond length is 1.14 Å. In the third N site, N(3) is bonded in a linear geometry to one N(2) and one O(2) atom. The N(3)-O(2) bond length is 1.20 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one Np(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Np(1) and one N(3) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Np(1) and one Co(1) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one N(1) atom.