K3Np(MoO5)2 crystallizes in the triclinic P-1 space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one O(4), one O(7), one O(9), two equivalent O(1), and two equivalent O(6) atoms. In the second K site, K(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(4), one O(6), one O(7), and one O(8) atom. In the third K site, K(3) is bonded in a 6-coordinate geometry to one O(10), one O(2), one O(4), one O(5), one O(7), and one O(8) atom. Np(1) is bonded to one O(1), one O(10), one O(2), one O(3), one O(5), one O(8), and one O(9) atom to form distorted NpO7 pentagonal bipyramids that share corners with two equivalent Mo(2)O4 tetrahedra and corners with three equivalent Mo(1)O4 tetrahedra. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(3), one O(5), one O(6), and one O(9) atom to form MoO4 tetrahedra that share corners with three equivalent Np(1)O7 pentagonal bipyramids. In the second Mo site, Mo(2) is bonded to one O(10), one O(2), one O(4), and one O(7) atom to form MoO4 tetrahedra that share corners with two equivalent Np(1)O7 pentagonal bipyramids. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(2), two equivalent K(1), and one Np(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one K(2), one K(3), one Np(1), and one Mo(2) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Np(1) and one Mo(1) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one K(1), one K(2), one K(3), and one Mo(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one K(3), one Np(1), and one Mo(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one K(2), two equivalent K(1), and one Mo(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one K(1), one K(2), one K(3), and one Mo(2) atom. In the eighth O site, O(8) is bonded in a 1-coordinate geometry to one K(2), one K(3), and one Np(1) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one K(1), one Np(1), and one Mo(1) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one K(3), one Np(1), and one Mo(2) atom.
K3Np(MoO5)2 crystallizes in the triclinic P-1 space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one O(4), one O(7), one O(9), two equivalent O(1), and two equivalent O(6) atoms. The K(1)-O(4) bond length is 3.15 Å. The K(1)-O(7) bond length is 3.06 Å. The K(1)-O(9) bond length is 3.01 Å. There is one shorter (2.76 Å) and one longer (2.85 Å) K(1)-O(1) bond length. There is one shorter (2.74 Å) and one longer (3.16 Å) K(1)-O(6) bond length. In the second K site, K(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(4), one O(6), one O(7), and one O(8) atom. The K(2)-O(1) bond length is 2.70 Å. The K(2)-O(2) bond length is 3.12 Å. The K(2)-O(4) bond length is 2.66 Å. The K(2)-O(6) bond length is 2.70 Å. The K(2)-O(7) bond length is 2.72 Å. The K(2)-O(8) bond length is 2.72 Å. In the third K site, K(3) is bonded in a 6-coordinate geometry to one O(10), one O(2), one O(4), one O(5), one O(7), and one O(8) atom. The K(3)-O(10) bond length is 2.98 Å. The K(3)-O(2) bond length is 2.96 Å. The K(3)-O(4) bond length is 3.06 Å. The K(3)-O(5) bond length is 2.69 Å. The K(3)-O(7) bond length is 2.84 Å. The K(3)-O(8) bond length is 2.82 Å. Np(1) is bonded to one O(1), one O(10), one O(2), one O(3), one O(5), one O(8), and one O(9) atom to form distorted NpO7 pentagonal bipyramids that share corners with two equivalent Mo(2)O4 tetrahedra and corners with three equivalent Mo(1)O4 tetrahedra. The Np(1)-O(1) bond length is 1.87 Å. The Np(1)-O(10) bond length is 2.51 Å. The Np(1)-O(2) bond length is 2.45 Å. The Np(1)-O(3) bond length is 2.49 Å. The Np(1)-O(5) bond length is 2.44 Å. The Np(1)-O(8) bond length is 1.86 Å. The Np(1)-O(9) bond length is 2.49 Å. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(3), one O(5), one O(6), and one O(9) atom to form MoO4 tetrahedra that share corners with three equivalent Np(1)O7 pentagonal bipyramids. The Mo(1)-O(3) bond length is 1.80 Å. The Mo(1)-O(5) bond length is 1.82 Å. The Mo(1)-O(6) bond length is 1.78 Å. The Mo(1)-O(9) bond length is 1.80 Å. In the second Mo site, Mo(2) is bonded to one O(10), one O(2), one O(4), and one O(7) atom to form MoO4 tetrahedra that share corners with two equivalent Np(1)O7 pentagonal bipyramids. The Mo(2)-O(10) bond length is 1.83 Å. The Mo(2)-O(2) bond length is 1.82 Å. The Mo(2)-O(4) bond length is 1.77 Å. The Mo(2)-O(7) bond length is 1.79 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(2), two equivalent K(1), and one Np(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one K(2), one K(3), one Np(1), and one Mo(2) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Np(1) and one Mo(1) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one K(1), one K(2), one K(3), and one Mo(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one K(3), one Np(1), and one Mo(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one K(2), two equivalent K(1), and one Mo(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one K(1), one K(2), one K(3), and one Mo(2) atom. In the eighth O site, O(8) is bonded in a 1-coordinate geometry to one K(2), one K(3), and one Np(1) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one K(1), one Np(1), and one Mo(1) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one K(3), one Np(1), and one Mo(2) atom.