K2Na2MgNb2(OF5)2 crystallizes in the monoclinic C2/m space group. K(1) is bonded in a 8-coordinate geometry to two equivalent F(1), two equivalent F(3), and four equivalent F(2) atoms. Na(1) is bonded in a 4-coordinate geometry to one O(1), one F(1), one F(3), and one F(4) atom. Mg(1) is bonded in a square co-planar geometry to two equivalent F(1) and two equivalent F(4) atoms. Nb(1) is bonded in a 6-coordinate geometry to one O(1), one F(1), one F(3), one F(4), and two equivalent F(2) atoms. O(1) is bonded in a linear geometry to one Na(1) and one Nb(1) atom. There are four inequivalent F sites. In the first F site, F(1) is bonded in a distorted single-bond geometry to two equivalent K(1), one Na(1), one Mg(1), and one Nb(1) atom. In the second F site, F(2) is bonded in a 1-coordinate geometry to two equivalent K(1) and one Nb(1) atom. In the third F site, F(3) is bonded to two equivalent K(1), one Na(1), and one Nb(1) atom to form distorted edge-sharing FK2NaNb trigonal pyramids. In the fourth F site, F(4) is bonded in a distorted trigonal planar geometry to one Na(1), one Mg(1), and one Nb(1) atom.
K2Na2MgNb2(OF5)2 crystallizes in the monoclinic C2/m space group. K(1) is bonded in a 8-coordinate geometry to two equivalent F(1), two equivalent F(3), and four equivalent F(2) atoms. Both K(1)-F(1) bond lengths are 2.87 Å. Both K(1)-F(3) bond lengths are 2.62 Å. There are two shorter (2.80 Å) and two longer (2.99 Å) K(1)-F(2) bond lengths. Na(1) is bonded in a 4-coordinate geometry to one O(1), one F(1), one F(3), and one F(4) atom. The Na(1)-O(1) bond length is 2.23 Å. The Na(1)-F(1) bond length is 2.63 Å. The Na(1)-F(3) bond length is 2.22 Å. The Na(1)-F(4) bond length is 2.28 Å. Mg(1) is bonded in a square co-planar geometry to two equivalent F(1) and two equivalent F(4) atoms. Both Mg(1)-F(1) bond lengths are 1.88 Å. Both Mg(1)-F(4) bond lengths are 1.92 Å. Nb(1) is bonded in a 6-coordinate geometry to one O(1), one F(1), one F(3), one F(4), and two equivalent F(2) atoms. The Nb(1)-O(1) bond length is 1.76 Å. The Nb(1)-F(1) bond length is 2.59 Å. The Nb(1)-F(3) bond length is 2.08 Å. The Nb(1)-F(4) bond length is 2.16 Å. Both Nb(1)-F(2) bond lengths are 2.09 Å. O(1) is bonded in a linear geometry to one Na(1) and one Nb(1) atom. There are four inequivalent F sites. In the first F site, F(1) is bonded in a distorted single-bond geometry to two equivalent K(1), one Na(1), one Mg(1), and one Nb(1) atom. In the second F site, F(2) is bonded in a 1-coordinate geometry to two equivalent K(1) and one Nb(1) atom. In the third F site, F(3) is bonded to two equivalent K(1), one Na(1), and one Nb(1) atom to form distorted edge-sharing FK2NaNb trigonal pyramids. In the fourth F site, F(4) is bonded in a distorted trigonal planar geometry to one Na(1), one Mg(1), and one Nb(1) atom.