KNp2F9 crystallizes in the orthorhombic Pnma space group. K(1) is bonded in a 10-coordinate geometry to two equivalent F(1), two equivalent F(2), two equivalent F(3), and four equivalent F(5) atoms. Np(1) is bonded in a 9-coordinate geometry to one F(4), two equivalent F(1), two equivalent F(2), two equivalent F(3), and two equivalent F(5) atoms. There are five inequivalent F sites. In the first F site, F(4) is bonded in a linear geometry to two equivalent Np(1) atoms. In the second F site, F(5) is bonded to two equivalent K(1) and two equivalent Np(1) atoms to form a mixture of distorted corner and edge-sharing FK2Np2 tetrahedra. In the third F site, F(1) is bonded in a distorted bent 150 degrees geometry to one K(1) and two equivalent Np(1) atoms. In the fourth F site, F(2) is bonded in a trigonal planar geometry to one K(1) and two equivalent Np(1) atoms. In the fifth F site, F(3) is bonded in a trigonal planar geometry to one K(1) and two equivalent Np(1) atoms.
KNp2F9 crystallizes in the orthorhombic Pnma space group. K(1) is bonded in a 10-coordinate geometry to two equivalent F(1), two equivalent F(2), two equivalent F(3), and four equivalent F(5) atoms. Both K(1)-F(1) bond lengths are 3.18 Å. Both K(1)-F(2) bond lengths are 2.62 Å. Both K(1)-F(3) bond lengths are 2.61 Å. There are two shorter (2.71 Å) and two longer (3.06 Å) K(1)-F(5) bond lengths. Np(1) is bonded in a 9-coordinate geometry to one F(4), two equivalent F(1), two equivalent F(2), two equivalent F(3), and two equivalent F(5) atoms. The Np(1)-F(4) bond length is 2.28 Å. There is one shorter (2.30 Å) and one longer (2.33 Å) Np(1)-F(1) bond length. There is one shorter (2.30 Å) and one longer (2.31 Å) Np(1)-F(2) bond length. There is one shorter (2.25 Å) and one longer (2.37 Å) Np(1)-F(3) bond length. There is one shorter (2.28 Å) and one longer (2.41 Å) Np(1)-F(5) bond length. There are five inequivalent F sites. In the first F site, F(4) is bonded in a linear geometry to two equivalent Np(1) atoms. In the second F site, F(5) is bonded to two equivalent K(1) and two equivalent Np(1) atoms to form a mixture of distorted corner and edge-sharing FK2Np2 tetrahedra. In the third F site, F(1) is bonded in a distorted bent 150 degrees geometry to one K(1) and two equivalent Np(1) atoms. In the fourth F site, F(2) is bonded in a trigonal planar geometry to one K(1) and two equivalent Np(1) atoms. In the fifth F site, F(3) is bonded in a trigonal planar geometry to one K(1) and two equivalent Np(1) atoms.