Sr2MgRuNiO6 crystallizes in the monoclinic Cm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 3-coordinate geometry to one O(4) and two equivalent O(2) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one Ru(1), one O(3), two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms. Mg(1) is bonded in a distorted trigonal planar geometry to one O(4) and two equivalent O(2) atoms. Ru(1) is bonded in a trigonal planar geometry to one Sr(2), one O(3), and two equivalent O(1) atoms. Ni(1) is bonded in a distorted square pyramidal geometry to one O(4), two equivalent O(1), and two equivalent O(2) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Sr(2), one Ru(1), and one Ni(1) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Sr(1), one Sr(2), one Mg(1), and one Ni(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Sr(2) and one Ru(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Sr(1), two equivalent Sr(2), one Mg(1), and one Ni(1) atom.
Sr2MgRuNiO6 crystallizes in the monoclinic Cm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 3-coordinate geometry to one O(4) and two equivalent O(2) atoms. The Sr(1)-O(4) bond length is 2.39 Å. Both Sr(1)-O(2) bond lengths are 2.41 Å. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one Ru(1), one O(3), two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms. The Sr(2)-Ru(1) bond length is 3.24 Å. The Sr(2)-O(3) bond length is 2.92 Å. Both Sr(2)-O(1) bond lengths are 2.80 Å. Both Sr(2)-O(2) bond lengths are 2.53 Å. Both Sr(2)-O(4) bond lengths are 3.11 Å. Mg(1) is bonded in a distorted trigonal planar geometry to one O(4) and two equivalent O(2) atoms. The Mg(1)-O(4) bond length is 1.89 Å. Both Mg(1)-O(2) bond lengths are 1.87 Å. Ru(1) is bonded in a trigonal planar geometry to one Sr(2), one O(3), and two equivalent O(1) atoms. The Ru(1)-O(3) bond length is 1.79 Å. Both Ru(1)-O(1) bond lengths are 1.81 Å. Ni(1) is bonded in a distorted square pyramidal geometry to one O(4), two equivalent O(1), and two equivalent O(2) atoms. The Ni(1)-O(4) bond length is 2.01 Å. Both Ni(1)-O(1) bond lengths are 2.14 Å. Both Ni(1)-O(2) bond lengths are 1.98 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Sr(2), one Ru(1), and one Ni(1) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Sr(1), one Sr(2), one Mg(1), and one Ni(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Sr(2) and one Ru(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Sr(1), two equivalent Sr(2), one Mg(1), and one Ni(1) atom.