K4MgRu2(OCl5)2 crystallizes in the monoclinic Cm space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a body-centered cubic geometry to one Cl(3), one Cl(4), one Cl(6), one Cl(7), two equivalent Cl(5), and two equivalent Cl(8) atoms. In the second K site, K(2) is bonded to one Cl(3), one Cl(4), one Cl(6), one Cl(7), two equivalent Cl(1), two equivalent Cl(2), two equivalent Cl(5), and two equivalent Cl(8) atoms to form KCl12 cuboctahedra that share corners with four equivalent K(2)Cl12 cuboctahedra, faces with four equivalent K(2)Cl12 cuboctahedra, faces with two equivalent Mg(1)Cl5O octahedra, faces with two equivalent Ru(1)Cl5O octahedra, and faces with two equivalent Ru(2)Cl5O octahedra. Mg(1) is bonded to one O(2), one Cl(1), one Cl(6), one Cl(7), and two equivalent Cl(8) atoms to form distorted MgCl5O octahedra that share  a cornercorner with one Ru(1)Cl5O octahedra, corners with four equivalent Ru(2)Cl5O octahedra, and faces with four equivalent K(2)Cl12 cuboctahedra. The corner-sharing octahedral tilt angles range from 1-3°. There are two inequivalent Ru sites. In the first Ru site, Ru(1) is bonded to one O(1), one Cl(1), one Cl(3), one Cl(4), and two equivalent Cl(5) atoms to form distorted RuCl5O octahedra that share  a cornercorner with one Mg(1)Cl5O octahedra,  a cornercorner with one Ru(2)Cl5O octahedra, and faces with four equivalent K(2)Cl12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the second Ru site, Ru(2) is bonded to one O(1), one Cl(2), one Cl(6), one Cl(7), and two equivalent Cl(8) atoms to form RuCl5O octahedra that share  a cornercorner with one Ru(1)Cl5O octahedra, corners with four equivalent Mg(1)Cl5O octahedra, and faces with four equivalent K(2)Cl12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-3°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Ru(1) and one Ru(2) atom. In the second O site, O(2) is bonded in a single-bond geometry to one Mg(1) atom. There are eight inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a 2-coordinate geometry to four equivalent K(2), one Mg(1), and one Ru(1) atom. In the second Cl site, Cl(2) is bonded in a distorted single-bond geometry to four equivalent K(2) and one Ru(2) atom. In the third Cl site, Cl(3) is bonded to two equivalent K(1), two equivalent K(2), and one Ru(1) atom to form distorted ClK4Ru square pyramids that share corners with two equivalent Cl(6)K4MgRu octahedra, corners with two equivalent Cl(7)K4MgRu octahedra, corners with eight equivalent Cl(8)K4MgRu octahedra,  a cornercorner with one Cl(4)K4Ru square pyramid,  an edgeedge with one Cl(6)K4MgRu octahedra,  an edgeedge with one Cl(7)K4MgRu octahedra, edges with two equivalent Cl(4)K4Ru square pyramids, edges with two equivalent Cl(5)K4Ru square pyramids, and faces with two equivalent Cl(5)K4Ru square pyramids. The corner-sharing octahedral tilt angles range from 3-73°. In the fourth Cl site, Cl(4) is bonded to two equivalent K(1), two equivalent K(2), and one Ru(1) atom to form distorted ClK4Ru square pyramids that share corners with two equivalent Cl(6)K4MgRu octahedra, corners with two equivalent Cl(7)K4MgRu octahedra, corners with eight equivalent Cl(8)K4MgRu octahedra,  a cornercorner with one Cl(3)K4Ru square pyramid,  an edgeedge with one Cl(6)K4MgRu octahedra,  an edgeedge with one Cl(7)K4MgRu octahedra, edges with two equivalent Cl(3)K4Ru square pyramids, edges with two equivalent Cl(5)K4Ru square pyramids, and faces with two equivalent Cl(5)K4Ru square pyramids. The corner-sharing octahedral tilt angles range from 2-72°. In the fifth Cl site, Cl(5) is bonded to two equivalent K(1), two equivalent K(2), and one Ru(1) atom to form distorted ClK4Ru square pyramids that share corners with four equivalent Cl(6)K4MgRu octahedra, corners with four equivalent Cl(7)K4MgRu octahedra, corners with four equivalent Cl(8)K4MgRu octahedra,  a cornercorner with one Cl(5)K4Ru square pyramid, edges with two equivalent Cl(8)K4MgRu octahedra,  an edgeedge with one Cl(3)K4Ru square pyramid,  an edgeedge with one Cl(4)K4Ru square pyramid, edges with two equivalent Cl(5)K4Ru square pyramids,  a faceface with one Cl(3)K4Ru square pyramid, and  a faceface with one Cl(4)K4Ru square pyramid. The corner-sharing octahedral tilt angles range from 2-73°. In the sixth Cl site, Cl(6) is bonded to two equivalent K(1), two equivalent K(2), one Mg(1), and one Ru(2) atom to form distorted ClK4MgRu octahedra that share corners with two equivalent Cl(7)K4MgRu octahedra, corners with two equivalent Cl(3)K4Ru square pyramids, corners with two equivalent Cl(4)K4Ru square pyramids, corners with eight equivalent Cl(5)K4Ru square pyramids, edges with two equivalent Cl(7)K4MgRu octahedra,  an edgeedge with one Cl(3)K4Ru square pyramid,  an edgeedge with one Cl(4)K4Ru square pyramid, and faces with four equivalent Cl(8)K4MgRu octahedra. The corner-sharing octahedral tilt angles range from 0-6°. In the seventh Cl site, Cl(7) is bonded to two equivalent K(1), two equivalent K(2), one Mg(1), and one Ru(2) atom to form distorted ClK4MgRu octahedra that share corners with two equivalent Cl(6)K4MgRu octahedra, corners with two equivalent Cl(3)K4Ru square pyramids, corners with two equivalent Cl(4)K4Ru square pyramids, corners with eight equivalent Cl(5)K4Ru square pyramids, edges with two equivalent Cl(6)K4MgRu octahedra,  an edgeedge with one Cl(3)K4Ru square pyramid,  an edgeedge with one Cl(4)K4Ru square pyramid, and faces with four equivalent Cl(8)K4MgRu octahedra. The corner-sharing octahedral tilt angles range from 0-6°. In the eighth Cl site, Cl(8) is bonded to two equivalent K(1), two equivalent K(2), one Mg(1), and one Ru(2) atom to form distorted ClK4MgRu octahedra that share corners with two equivalent Cl(8)K4MgRu octahedra, corners with four equivalent Cl(3)K4Ru square pyramids, corners with four equivalent Cl(4)K4Ru square pyramids, corners with four equivalent Cl(5)K4Ru square pyramids, edges with two equivalent Cl(8)K4MgRu octahedra, edges with two equivalent Cl(5)K4Ru square pyramids, faces with two equivalent Cl(6)K4MgRu octahedra, and faces with two equivalent Cl(7)K4MgRu octahedra. The corner-sharing octahedral tilt angles range from 1-6°.
K4MgRu2(OCl5)2 crystallizes in the monoclinic Cm space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a body-centered cubic geometry to one Cl(3), one Cl(4), one Cl(6), one Cl(7), two equivalent Cl(5), and two equivalent Cl(8) atoms. The K(1)-Cl(3) bond length is 3.21 Å. The K(1)-Cl(4) bond length is 3.20 Å. The K(1)-Cl(6) bond length is 3.29 Å. The K(1)-Cl(7) bond length is 3.32 Å. There is one shorter (3.20 Å) and one longer (3.21 Å) K(1)-Cl(5) bond length. There is one shorter (3.30 Å) and one longer (3.31 Å) K(1)-Cl(8) bond length. In the second K site, K(2) is bonded to one Cl(3), one Cl(4), one Cl(6), one Cl(7), two equivalent Cl(1), two equivalent Cl(2), two equivalent Cl(5), and two equivalent Cl(8) atoms to form KCl12 cuboctahedra that share corners with four equivalent K(2)Cl12 cuboctahedra, faces with four equivalent K(2)Cl12 cuboctahedra, faces with two equivalent Mg(1)Cl5O octahedra, faces with two equivalent Ru(1)Cl5O octahedra, and faces with two equivalent Ru(2)Cl5O octahedra. The K(2)-Cl(3) bond length is 3.41 Å. The K(2)-Cl(4) bond length is 3.41 Å. The K(2)-Cl(6) bond length is 3.61 Å. The K(2)-Cl(7) bond length is 3.61 Å. There is one shorter (3.60 Å) and one longer (3.63 Å) K(2)-Cl(1) bond length. There is one shorter (3.62 Å) and one longer (3.63 Å) K(2)-Cl(2) bond length. There is one shorter (3.41 Å) and one longer (3.42 Å) K(2)-Cl(5) bond length. Both K(2)-Cl(8) bond lengths are 3.61 Å. Mg(1) is bonded to one O(2), one Cl(1), one Cl(6), one Cl(7), and two equivalent Cl(8) atoms to form distorted MgCl5O octahedra that share  a cornercorner with one Ru(1)Cl5O octahedra, corners with four equivalent Ru(2)Cl5O octahedra, and faces with four equivalent K(2)Cl12 cuboctahedra. The corner-sharing octahedral tilt angles range from 1-3°. The Mg(1)-O(2) bond length is 1.87 Å. The Mg(1)-Cl(1) bond length is 2.43 Å. The Mg(1)-Cl(6) bond length is 2.73 Å. The Mg(1)-Cl(7) bond length is 2.66 Å. Both Mg(1)-Cl(8) bond lengths are 2.69 Å. There are two inequivalent Ru sites. In the first Ru site, Ru(1) is bonded to one O(1), one Cl(1), one Cl(3), one Cl(4), and two equivalent Cl(5) atoms to form distorted RuCl5O octahedra that share  a cornercorner with one Mg(1)Cl5O octahedra,  a cornercorner with one Ru(2)Cl5O octahedra, and faces with four equivalent K(2)Cl12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-1°. The Ru(1)-O(1) bond length is 1.80 Å. The Ru(1)-Cl(1) bond length is 2.60 Å. The Ru(1)-Cl(3) bond length is 2.37 Å. The Ru(1)-Cl(4) bond length is 2.37 Å. Both Ru(1)-Cl(5) bond lengths are 2.37 Å. In the second Ru site, Ru(2) is bonded to one O(1), one Cl(2), one Cl(6), one Cl(7), and two equivalent Cl(8) atoms to form RuCl5O octahedra that share  a cornercorner with one Ru(1)Cl5O octahedra, corners with four equivalent Mg(1)Cl5O octahedra, and faces with four equivalent K(2)Cl12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-3°. The Ru(2)-O(1) bond length is 1.87 Å. The Ru(2)-Cl(2) bond length is 2.35 Å. The Ru(2)-Cl(6) bond length is 2.41 Å. The Ru(2)-Cl(7) bond length is 2.42 Å. Both Ru(2)-Cl(8) bond lengths are 2.42 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Ru(1) and one Ru(2) atom. In the second O site, O(2) is bonded in a single-bond geometry to one Mg(1) atom. There are eight inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a 2-coordinate geometry to four equivalent K(2), one Mg(1), and one Ru(1) atom. In the second Cl site, Cl(2) is bonded in a distorted single-bond geometry to four equivalent K(2) and one Ru(2) atom. In the third Cl site, Cl(3) is bonded to two equivalent K(1), two equivalent K(2), and one Ru(1) atom to form distorted ClK4Ru square pyramids that share corners with two equivalent Cl(6)K4MgRu octahedra, corners with two equivalent Cl(7)K4MgRu octahedra, corners with eight equivalent Cl(8)K4MgRu octahedra,  a cornercorner with one Cl(4)K4Ru square pyramid,  an edgeedge with one Cl(6)K4MgRu octahedra,  an edgeedge with one Cl(7)K4MgRu octahedra, edges with two equivalent Cl(4)K4Ru square pyramids, edges with two equivalent Cl(5)K4Ru square pyramids, and faces with two equivalent Cl(5)K4Ru square pyramids. The corner-sharing octahedral tilt angles range from 3-73°. In the fourth Cl site, Cl(4) is bonded to two equivalent K(1), two equivalent K(2), and one Ru(1) atom to form distorted ClK4Ru square pyramids that share corners with two equivalent Cl(6)K4MgRu octahedra, corners with two equivalent Cl(7)K4MgRu octahedra, corners with eight equivalent Cl(8)K4MgRu octahedra,  a cornercorner with one Cl(3)K4Ru square pyramid,  an edgeedge with one Cl(6)K4MgRu octahedra,  an edgeedge with one Cl(7)K4MgRu octahedra, edges with two equivalent Cl(3)K4Ru square pyramids, edges with two equivalent Cl(5)K4Ru square pyramids, and faces with two equivalent Cl(5)K4Ru square pyramids. The corner-sharing octahedral tilt angles range from 2-72°. In the fifth Cl site, Cl(5) is bonded to two equivalent K(1), two equivalent K(2), and one Ru(1) atom to form distorted ClK4Ru square pyramids that share corners with four equivalent Cl(6)K4MgRu octahedra, corners with four equivalent Cl(7)K4MgRu octahedra, corners with four equivalent Cl(8)K4MgRu octahedra,  a cornercorner with one Cl(5)K4Ru square pyramid, edges with two equivalent Cl(8)K4MgRu octahedra,  an edgeedge with one Cl(3)K4Ru square pyramid,  an edgeedge with one Cl(4)K4Ru square pyramid, edges with two equivalent Cl(5)K4Ru square pyramids,  a faceface with one Cl(3)K4Ru square pyramid, and  a faceface with one Cl(4)K4Ru square pyramid. The corner-sharing octahedral tilt angles range from 2-73°. In the sixth Cl site, Cl(6) is bonded to two equivalent K(1), two equivalent K(2), one Mg(1), and one Ru(2) atom to form distorted ClK4MgRu octahedra that share corners with two equivalent Cl(7)K4MgRu octahedra, corners with two equivalent Cl(3)K4Ru square pyramids, corners with two equivalent Cl(4)K4Ru square pyramids, corners with eight equivalent Cl(5)K4Ru square pyramids, edges with two equivalent Cl(7)K4MgRu octahedra,  an edgeedge with one Cl(3)K4Ru square pyramid,  an edgeedge with one Cl(4)K4Ru square pyramid, and faces with four equivalent Cl(8)K4MgRu octahedra. The corner-sharing octahedral tilt angles range from 0-6°. In the seventh Cl site, Cl(7) is bonded to two equivalent K(1), two equivalent K(2), one Mg(1), and one Ru(2) atom to form distorted ClK4MgRu octahedra that share corners with two equivalent Cl(6)K4MgRu octahedra, corners with two equivalent Cl(3)K4Ru square pyramids, corners with two equivalent Cl(4)K4Ru square pyramids, corners with eight equivalent Cl(5)K4Ru square pyramids, edges with two equivalent Cl(6)K4MgRu octahedra,  an edgeedge with one Cl(3)K4Ru square pyramid,  an edgeedge with one Cl(4)K4Ru square pyramid, and faces with four equivalent Cl(8)K4MgRu octahedra. The corner-sharing octahedral tilt angles range from 0-6°. In the eighth Cl site, Cl(8) is bonded to two equivalent K(1), two equivalent K(2), one Mg(1), and one Ru(2) atom to form distorted ClK4MgRu octahedra that share corners with two equivalent Cl(8)K4MgRu octahedra, corners with four equivalent Cl(3)K4Ru square pyramids, corners with four equivalent Cl(4)K4Ru square pyramids, corners with four equivalent Cl(5)K4Ru square pyramids, edges with two equivalent Cl(8)K4MgRu octahedra, edges with two equivalent Cl(5)K4Ru square pyramids, faces with two equivalent Cl(6)K4MgRu octahedra, and faces with two equivalent Cl(7)K4MgRu octahedra. The corner-sharing octahedral tilt angles range from 1-6°.