K2LuF5 crystallizes in the orthorhombic Pnma space group. K(1) is bonded in a 8-coordinate geometry to two equivalent F(1), two equivalent F(2), two equivalent F(3), and two equivalent F(4) atoms. Lu(1) is bonded to one F(1), one F(2), one F(3), and four equivalent F(4) atoms to form distorted edge-sharing LuF7 pentagonal bipyramids. There are four inequivalent F sites. In the first F site, F(1) is bonded to four equivalent K(1) and one Lu(1) atom to form a mixture of distorted corner, face, and edge-sharing FK4Lu trigonal bipyramids. In the second F site, F(2) is bonded in a 5-coordinate geometry to four equivalent K(1) and one Lu(1) atom. In the third F site, F(3) is bonded to four equivalent K(1) and one Lu(1) atom to form a mixture of distorted corner, face, and edge-sharing FK4Lu trigonal bipyramids. In the fourth F site, F(4) is bonded in a 4-coordinate geometry to two equivalent K(1) and two equivalent Lu(1) atoms.
K2LuF5 crystallizes in the orthorhombic Pnma space group. K(1) is bonded in a 8-coordinate geometry to two equivalent F(1), two equivalent F(2), two equivalent F(3), and two equivalent F(4) atoms. There is one shorter (2.62 Å) and one longer (2.68 Å) K(1)-F(1) bond length. There is one shorter (2.71 Å) and one longer (2.81 Å) K(1)-F(2) bond length. There is one shorter (2.60 Å) and one longer (2.70 Å) K(1)-F(3) bond length. There is one shorter (2.76 Å) and one longer (2.84 Å) K(1)-F(4) bond length. Lu(1) is bonded to one F(1), one F(2), one F(3), and four equivalent F(4) atoms to form distorted edge-sharing LuF7 pentagonal bipyramids. The Lu(1)-F(1) bond length is 2.13 Å. The Lu(1)-F(2) bond length is 2.12 Å. The Lu(1)-F(3) bond length is 2.12 Å. There are two shorter (2.19 Å) and two longer (2.22 Å) Lu(1)-F(4) bond lengths. There are four inequivalent F sites. In the first F site, F(1) is bonded to four equivalent K(1) and one Lu(1) atom to form a mixture of distorted corner, face, and edge-sharing FK4Lu trigonal bipyramids. In the second F site, F(2) is bonded in a 5-coordinate geometry to four equivalent K(1) and one Lu(1) atom. In the third F site, F(3) is bonded to four equivalent K(1) and one Lu(1) atom to form a mixture of distorted corner, face, and edge-sharing FK4Lu trigonal bipyramids. In the fourth F site, F(4) is bonded in a 4-coordinate geometry to two equivalent K(1) and two equivalent Lu(1) atoms.