NaMg14C crystallizes in the hexagonal P-6m2 space group. Na(1) is bonded to six equivalent Mg(1) and six equivalent Mg(3) atoms to form NaMg12 cuboctahedra that share corners with six equivalent Na(1)Mg12 cuboctahedra, edges with six equivalent Mg(1)Na2Mg10 cuboctahedra, faces with six equivalent Mg(4)Mg12 cuboctahedra, and faces with six equivalent Mg(1)Na2Mg10 cuboctahedra. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Na(1), two equivalent Mg(4), four equivalent Mg(1), and four equivalent Mg(3) atoms to form distorted MgNa2Mg10 cuboctahedra that share corners with six equivalent Mg(1)Na2Mg10 cuboctahedra, edges with two equivalent Na(1)Mg12 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, edges with four equivalent Mg(1)Na2Mg10 cuboctahedra, faces with two equivalent Na(1)Mg12 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, and faces with four equivalent Mg(1)Na2Mg10 cuboctahedra. In the second Mg site, Mg(2) is bonded in a 10-coordinate geometry to two equivalent Mg(4), four equivalent Mg(2), and four equivalent Mg(3) atoms. In the third Mg site, Mg(3) is bonded in a 12-coordinate geometry to one Na(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), 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, edges with six equivalent Mg(1)Na2Mg10 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with three equivalent Na(1)Mg12 cuboctahedra, and faces with three equivalent Mg(1)Na2Mg10 cuboctahedra. C(1) is bonded in a 6-coordinate geometry to six equivalent Mg(3) atoms.
NaMg14C crystallizes in the hexagonal P-6m2 space group. Na(1) is bonded to six equivalent Mg(1) and six equivalent Mg(3) atoms to form NaMg12 cuboctahedra that share corners with six equivalent Na(1)Mg12 cuboctahedra, edges with six equivalent Mg(1)Na2Mg10 cuboctahedra, faces with six equivalent Mg(4)Mg12 cuboctahedra, and faces with six equivalent Mg(1)Na2Mg10 cuboctahedra. All Na(1)-Mg(1) bond lengths are 3.16 Å. All Na(1)-Mg(3) bond lengths are 3.24 Å. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Na(1), two equivalent Mg(4), four equivalent Mg(1), and four equivalent Mg(3) atoms to form distorted MgNa2Mg10 cuboctahedra that share corners with six equivalent Mg(1)Na2Mg10 cuboctahedra, edges with two equivalent Na(1)Mg12 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, edges with four equivalent Mg(1)Na2Mg10 cuboctahedra, faces with two equivalent Na(1)Mg12 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, and faces with four equivalent Mg(1)Na2Mg10 cuboctahedra. Both Mg(1)-Mg(4) bond lengths are 3.09 Å. There are two shorter (3.08 Å) and two longer (3.24 Å) Mg(1)-Mg(1) bond lengths. All Mg(1)-Mg(3) bond lengths are 3.29 Å. In the second Mg site, Mg(2) is bonded in a 10-coordinate geometry to two equivalent Mg(4), four equivalent Mg(2), and four equivalent Mg(3) atoms. Both Mg(2)-Mg(4) bond lengths are 3.11 Å. There are two shorter (3.06 Å) and two longer (3.26 Å) Mg(2)-Mg(2) bond lengths. All Mg(2)-Mg(3) bond lengths are 2.97 Å. In the third Mg site, Mg(3) is bonded in a 12-coordinate geometry to one Na(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), and one C(1) atom. Both Mg(3)-Mg(4) bond lengths are 3.17 Å. The Mg(3)-C(1) bond length is 2.88 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, edges with six equivalent Mg(1)Na2Mg10 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with three equivalent Na(1)Mg12 cuboctahedra, and faces with three equivalent Mg(1)Na2Mg10 cuboctahedra. C(1) is bonded in a 6-coordinate geometry to six equivalent Mg(3) atoms.