K3NaMg(RuO4)2 crystallizes in the monoclinic C2 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one O(3), one O(4), two equivalent O(1), and three equivalent O(2) atoms. In the second K site, K(2) is bonded in a 6-coordinate geometry to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Na(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted NaO6 octahedra that share corners with six equivalent Ru(1)O4 tetrahedra. Mg(1) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(4) atoms. Ru(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form RuO4 tetrahedra that share corners with three equivalent Na(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 7-48°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to two equivalent K(1), one Na(1), one Mg(1), and one Ru(1) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one K(2), three equivalent K(1), one Na(1), and one Ru(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one K(1), one K(2), one Na(1), and one Ru(1) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one K(1), one K(2), one Mg(1), and one Ru(1) atom.
K3NaMg(RuO4)2 crystallizes in the monoclinic C2 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one O(3), one O(4), two equivalent O(1), and three equivalent O(2) atoms. The K(1)-O(3) bond length is 2.76 Å. The K(1)-O(4) bond length is 2.55 Å. There is one shorter (3.13 Å) and one longer (3.25 Å) K(1)-O(1) bond length. There are a spread of K(1)-O(2) bond distances ranging from 2.99-3.31 Å. In the second K site, K(2) is bonded in a 6-coordinate geometry to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Both K(2)-O(2) bond lengths are 2.96 Å. Both K(2)-O(3) bond lengths are 2.92 Å. Both K(2)-O(4) bond lengths are 2.77 Å. Na(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted NaO6 octahedra that share corners with six equivalent Ru(1)O4 tetrahedra. Both Na(1)-O(1) bond lengths are 2.81 Å. Both Na(1)-O(2) bond lengths are 2.55 Å. Both Na(1)-O(3) bond lengths are 2.35 Å. Mg(1) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(4) atoms. Both Mg(1)-O(1) bond lengths are 2.01 Å. Both Mg(1)-O(4) bond lengths are 1.97 Å. Ru(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form RuO4 tetrahedra that share corners with three equivalent Na(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 7-48°. The Ru(1)-O(1) bond length is 1.94 Å. The Ru(1)-O(2) bond length is 1.79 Å. The Ru(1)-O(3) bond length is 1.78 Å. The Ru(1)-O(4) bond length is 1.90 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to two equivalent K(1), one Na(1), one Mg(1), and one Ru(1) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one K(2), three equivalent K(1), one Na(1), and one Ru(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one K(1), one K(2), one Na(1), and one Ru(1) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one K(1), one K(2), one Mg(1), and one Ru(1) atom.