Mg14SnC crystallizes in the hexagonal P-6m2 space group. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a distorted linear geometry to two equivalent Mg(4), four equivalent Mg(3), and two equivalent Sn(1) atoms. In the second Mg site, Mg(2) is bonded in a 10-coordinate geometry to two equivalent Mg(4) and four equivalent Mg(3) atoms. In the third Mg site, Mg(3) is bonded in a 12-coordinate geometry to two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), four equivalent Mg(3), one Sn(1), and one C(1) atom. In the fourth Mg site, Mg(4) is bonded to three equivalent Mg(1), three equivalent Mg(2), and six equivalent Mg(3) atoms to form MgMg12 cuboctahedra that share corners with six equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, and faces with three equivalent Sn(1)Mg12 cuboctahedra. Sn(1) is bonded to six equivalent Mg(1) and six equivalent Mg(3) atoms to form SnMg12 cuboctahedra that share corners with six equivalent Sn(1)Mg12 cuboctahedra and faces with six equivalent Mg(4)Mg12 cuboctahedra. C(1) is bonded in a 6-coordinate geometry to six equivalent Mg(3) atoms.
Mg14SnC crystallizes in the hexagonal P-6m2 space group. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a distorted linear geometry to two equivalent Mg(4), four equivalent Mg(3), and two equivalent Sn(1) atoms. Both Mg(1)-Mg(4) bond lengths are 3.11 Å. All Mg(1)-Mg(3) bond lengths are 3.26 Å. Both Mg(1)-Sn(1) bond lengths are 3.13 Å. In the second Mg site, Mg(2) is bonded in a 10-coordinate geometry to two equivalent Mg(4) and four equivalent Mg(3) atoms. Both Mg(2)-Mg(4) bond lengths are 3.05 Å. All Mg(2)-Mg(3) bond lengths are 2.96 Å. In the third Mg site, Mg(3) is bonded in a 12-coordinate geometry to two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), four equivalent Mg(3), one Sn(1), and one C(1) atom. Both Mg(3)-Mg(4) bond lengths are 3.13 Å. There are two shorter (3.05 Å) and two longer (3.20 Å) Mg(3)-Mg(3) bond lengths. The Mg(3)-Sn(1) bond length is 3.22 Å. The Mg(3)-C(1) bond length is 2.91 Å. In the fourth Mg site, Mg(4) is bonded to three equivalent Mg(1), three equivalent Mg(2), and six equivalent Mg(3) atoms to form MgMg12 cuboctahedra that share corners with six equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, and faces with three equivalent Sn(1)Mg12 cuboctahedra. Sn(1) is bonded to six equivalent Mg(1) and six equivalent Mg(3) atoms to form SnMg12 cuboctahedra that share corners with six equivalent Sn(1)Mg12 cuboctahedra and faces with six equivalent Mg(4)Mg12 cuboctahedra. C(1) is bonded in a 6-coordinate geometry to six equivalent Mg(3) atoms.