SrMg6Cu crystallizes in the orthorhombic Amm2 space group. Sr(1) is bonded in a 12-coordinate geometry to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(2), and two equivalent Cu(1) atoms. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a distorted single-bond geometry to two equivalent Sr(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and one Cu(1) atom. In the second Mg site, Mg(2) is bonded in a 10-coordinate geometry to two equivalent Sr(1), one Mg(3), one Mg(4), two equivalent Mg(1), two equivalent Mg(2), and two equivalent Cu(1) atoms. In the third Mg site, Mg(3) is bonded in a 8-coordinate geometry to two equivalent Mg(2), two equivalent Mg(4), and four equivalent Mg(1) atoms. In the fourth Mg site, Mg(4) is bonded in a 10-coordinate geometry to two equivalent Sr(1), two equivalent Mg(2), two equivalent Mg(3), and four equivalent Mg(1) atoms. Cu(1) is bonded in a 8-coordinate geometry to two equivalent Sr(1), two equivalent Mg(1), and four equivalent Mg(2) atoms.
SrMg6Cu crystallizes in the orthorhombic Amm2 space group. Sr(1) is bonded in a 12-coordinate geometry to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(2), and two equivalent Cu(1) atoms. Both Sr(1)-Mg(4) bond lengths are 3.33 Å. There are two shorter (3.53 Å) and two longer (3.75 Å) Sr(1)-Mg(1) bond lengths. All Sr(1)-Mg(2) bond lengths are 3.37 Å. Both Sr(1)-Cu(1) bond lengths are 3.30 Å. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a distorted single-bond geometry to two equivalent Sr(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and one Cu(1) atom. Both Mg(1)-Mg(2) bond lengths are 3.08 Å. Both Mg(1)-Mg(3) bond lengths are 3.44 Å. Both Mg(1)-Mg(4) bond lengths are 3.10 Å. The Mg(1)-Cu(1) bond length is 2.69 Å. In the second Mg site, Mg(2) is bonded in a 10-coordinate geometry to two equivalent Sr(1), one Mg(3), one Mg(4), two equivalent Mg(1), two equivalent Mg(2), and two equivalent Cu(1) atoms. The Mg(2)-Mg(3) bond length is 3.30 Å. The Mg(2)-Mg(4) bond length is 3.13 Å. There is one shorter (2.96 Å) and one longer (3.15 Å) Mg(2)-Mg(2) bond length. Both Mg(2)-Cu(1) bond lengths are 2.92 Å. In the third Mg site, Mg(3) is bonded in a 8-coordinate geometry to two equivalent Mg(2), two equivalent Mg(4), and four equivalent Mg(1) atoms. Both Mg(3)-Mg(4) bond lengths are 3.18 Å. In the fourth Mg site, Mg(4) is bonded in a 10-coordinate geometry to two equivalent Sr(1), two equivalent Mg(2), two equivalent Mg(3), and four equivalent Mg(1) atoms. Cu(1) is bonded in a 8-coordinate geometry to two equivalent Sr(1), two equivalent Mg(1), and four equivalent Mg(2) atoms.