K2ErF5 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. Er(1) is bonded to one F(1), one F(2), one F(4), and four equivalent F(3) atoms to form distorted edge-sharing ErF7 pentagonal bipyramids. There are four inequivalent F sites. In the first F site, F(1) is bonded in a 5-coordinate geometry to four equivalent K(1) and one Er(1) atom. In the second F site, F(2) is bonded to four equivalent K(1) and one Er(1) atom to form a mixture of distorted corner, edge, and face-sharing FK4Er trigonal bipyramids. In the third F site, F(3) is bonded in a 4-coordinate geometry to two equivalent K(1) and two equivalent Er(1) atoms. In the fourth F site, F(4) is bonded to four equivalent K(1) and one Er(1) atom to form a mixture of distorted corner, edge, and face-sharing FK4Er trigonal bipyramids.
K2ErF5 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 (2.72 Å) and one longer (2.81 Å) K(1)-F(1) bond length. There is one shorter (2.63 Å) and one longer (2.69 Å) K(1)-F(2) bond length. There is one shorter (2.75 Å) and one longer (2.83 Å) K(1)-F(3) bond length. There is one shorter (2.61 Å) and one longer (2.71 Å) K(1)-F(4) bond length. Er(1) is bonded to one F(1), one F(2), one F(4), and four equivalent F(3) atoms to form distorted edge-sharing ErF7 pentagonal bipyramids. The Er(1)-F(1) bond length is 2.16 Å. The Er(1)-F(2) bond length is 2.17 Å. The Er(1)-F(4) bond length is 2.16 Å. There are two shorter (2.23 Å) and two longer (2.25 Å) Er(1)-F(3) bond lengths. There are four inequivalent F sites. In the first F site, F(1) is bonded in a 5-coordinate geometry to four equivalent K(1) and one Er(1) atom. In the second F site, F(2) is bonded to four equivalent K(1) and one Er(1) atom to form a mixture of distorted corner, edge, and face-sharing FK4Er trigonal bipyramids. In the third F site, F(3) is bonded in a 4-coordinate geometry to two equivalent K(1) and two equivalent Er(1) atoms. In the fourth F site, F(4) is bonded to four equivalent K(1) and one Er(1) atom to form a mixture of distorted corner, edge, and face-sharing FK4Er trigonal bipyramids.