K2TmF5 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. Tm(1) is bonded to one F(1), one F(2), one F(3), and four equivalent F(4) atoms to form distorted edge-sharing TmF7 pentagonal bipyramids. There are four inequivalent F sites. In the first F site, F(1) is bonded to four equivalent K(1) and one Tm(1) atom to form a mixture of distorted corner, face, and edge-sharing FK4Tm trigonal bipyramids. In the second F site, F(2) is bonded in a 5-coordinate geometry to four equivalent K(1) and one Tm(1) atom. In the third F site, F(3) is bonded to four equivalent K(1) and one Tm(1) atom to form a mixture of distorted corner, face, and edge-sharing FK4Tm trigonal bipyramids. In the fourth F site, F(4) is bonded in a 4-coordinate geometry to two equivalent K(1) and two equivalent Tm(1) atoms.
K2TmF5 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 (2.69 Å) K(1)-F(1) bond length. There is one shorter (2.73 Å) and one longer (2.80 Å) K(1)-F(2) bond length. There is one shorter (2.61 Å) and one longer (2.71 Å) K(1)-F(3) bond length. There is one shorter (2.76 Å) and one longer (2.82 Å) K(1)-F(4) bond length. Tm(1) is bonded to one F(1), one F(2), one F(3), and four equivalent F(4) atoms to form distorted edge-sharing TmF7 pentagonal bipyramids. The Tm(1)-F(1) bond length is 2.15 Å. The Tm(1)-F(2) bond length is 2.14 Å. The Tm(1)-F(3) bond length is 2.14 Å. There are two shorter (2.21 Å) and two longer (2.24 Å) Tm(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 Tm(1) atom to form a mixture of distorted corner, face, and edge-sharing FK4Tm trigonal bipyramids. In the second F site, F(2) is bonded in a 5-coordinate geometry to four equivalent K(1) and one Tm(1) atom. In the third F site, F(3) is bonded to four equivalent K(1) and one Tm(1) atom to form a mixture of distorted corner, face, and edge-sharing FK4Tm trigonal bipyramids. In the fourth F site, F(4) is bonded in a 4-coordinate geometry to two equivalent K(1) and two equivalent Tm(1) atoms.