Sr2MgCu3(O2Cl)2 crystallizes in the monoclinic C2/m space group. Sr(1) is bonded in a 5-coordinate geometry to one Mg(1) and four equivalent Cl(1) atoms. Mg(1) is bonded in a square co-planar geometry to two equivalent Sr(1), two equivalent O(1), and two equivalent O(2) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. In the second Cu site, Cu(2) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a square co-planar geometry to one Mg(1), one Cu(1), and two equivalent Cu(2) atoms. In the second O site, O(2) is bonded in a square co-planar geometry to one Mg(1), one Cu(1), and two equivalent Cu(2) atoms. Cl(1) is bonded to four equivalent Sr(1) atoms to form a mixture of distorted edge and corner-sharing ClSr4 trigonal pyramids.
Sr2MgCu3(O2Cl)2 crystallizes in the monoclinic C2/m space group. Sr(1) is bonded in a 5-coordinate geometry to one Mg(1) and four equivalent Cl(1) atoms. The Sr(1)-Mg(1) bond length is 2.87 Å. All Sr(1)-Cl(1) bond lengths are 3.02 Å. Mg(1) is bonded in a square co-planar geometry to two equivalent Sr(1), two equivalent O(1), and two equivalent O(2) atoms. Both Mg(1)-O(1) bond lengths are 1.96 Å. Both Mg(1)-O(2) bond lengths are 1.96 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Cu(1)-O(1) bond lengths are 2.04 Å. Both Cu(1)-O(2) bond lengths are 2.02 Å. In the second Cu site, Cu(2) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Cu(2)-O(1) bond lengths are 1.99 Å. Both Cu(2)-O(2) bond lengths are 2.00 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a square co-planar geometry to one Mg(1), one Cu(1), and two equivalent Cu(2) atoms. In the second O site, O(2) is bonded in a square co-planar geometry to one Mg(1), one Cu(1), and two equivalent Cu(2) atoms. Cl(1) is bonded to four equivalent Sr(1) atoms to form a mixture of distorted edge and corner-sharing ClSr4 trigonal pyramids.