KU2F9 crystallizes in the orthorhombic Pnma space group. K(1) is bonded in a 7-coordinate geometry to one F(1), two equivalent F(2), two equivalent F(4), and two equivalent F(5) atoms. U(1) is bonded to one F(1), one F(4), one F(5), two equivalent F(2), and two equivalent F(3) atoms to form a mixture of distorted edge and corner-sharing UF7 pentagonal bipyramids. There are five inequivalent F sites. In the first F site, F(1) is bonded in a distorted T-shaped geometry to one K(1) and two equivalent U(1) atoms. In the second F site, F(2) is bonded in a 3-coordinate geometry to one K(1) and two equivalent U(1) atoms. In the third F site, F(3) is bonded in a bent 120 degrees geometry to two equivalent U(1) atoms. In the fourth F site, F(4) is bonded in a bent 150 degrees geometry to one K(1) and one U(1) atom. In the fifth F site, F(5) is bonded in a bent 150 degrees geometry to one K(1) and one U(1) atom.
KU2F9 crystallizes in the orthorhombic Pnma space group. K(1) is bonded in a 7-coordinate geometry to one F(1), two equivalent F(2), two equivalent F(4), and two equivalent F(5) atoms. The K(1)-F(1) bond length is 3.09 Å. Both K(1)-F(2) bond lengths are 3.11 Å. Both K(1)-F(4) bond lengths are 2.64 Å. Both K(1)-F(5) bond lengths are 2.63 Å. U(1) is bonded to one F(1), one F(4), one F(5), two equivalent F(2), and two equivalent F(3) atoms to form a mixture of distorted edge and corner-sharing UF7 pentagonal bipyramids. The U(1)-F(1) bond length is 2.37 Å. The U(1)-F(4) bond length is 2.13 Å. The U(1)-F(5) bond length is 2.09 Å. There is one shorter (2.26 Å) and one longer (2.44 Å) U(1)-F(2) bond length. Both U(1)-F(3) bond lengths are 2.30 Å. There are five inequivalent F sites. In the first F site, F(1) is bonded in a distorted T-shaped geometry to one K(1) and two equivalent U(1) atoms. In the second F site, F(2) is bonded in a 3-coordinate geometry to one K(1) and two equivalent U(1) atoms. In the third F site, F(3) is bonded in a bent 120 degrees geometry to two equivalent U(1) atoms. In the fourth F site, F(4) is bonded in a bent 150 degrees geometry to one K(1) and one U(1) atom. In the fifth F site, F(5) is bonded in a bent 150 degrees geometry to one K(1) and one U(1) atom.