NaMg14C crystallizes in the orthorhombic Amm2 space group. Na(1) is bonded in a 10-coordinate geometry to two equivalent Mg(6), four equivalent Mg(3), and four equivalent Mg(5) atoms. There are seven inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(2), two equivalent Mg(6), four equivalent Mg(4), and four equivalent Mg(5) atoms to form a mixture of distorted edge, face, and corner-sharing MgMg12 cuboctahedra. In the second Mg site, Mg(2) is bonded to two equivalent Mg(1), two equivalent Mg(7), four equivalent Mg(4), and four equivalent Mg(5) atoms to form a mixture of edge, face, and corner-sharing MgMg12 cuboctahedra. In the third Mg site, Mg(3) is bonded in a single-bond geometry to two equivalent Na(1), two equivalent Mg(6), two equivalent Mg(7), and one C(1) atom. In the fourth Mg site, Mg(4) is bonded to two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), two equivalent Mg(5), two equivalent Mg(6), and two equivalent Mg(7) atoms to form a mixture of distorted edge, face, and corner-sharing MgMg12 cuboctahedra. In the fifth Mg site, Mg(5) is bonded in a 1-coordinate geometry to one Na(1), one Mg(1), one Mg(2), one Mg(4), two equivalent Mg(6), two equivalent Mg(7), and one C(1) atom. In the sixth Mg site, Mg(6) is bonded in a 12-coordinate geometry to one Na(1), one Mg(1), two equivalent Mg(3), two equivalent Mg(4), two equivalent Mg(7), and four equivalent Mg(5) atoms. In the seventh Mg site, Mg(7) is bonded in a 11-coordinate geometry to one Mg(2), two equivalent Mg(3), two equivalent Mg(4), two equivalent Mg(6), and four equivalent Mg(5) atoms. C(1) is bonded in a 6-coordinate geometry to two equivalent Mg(3) and four equivalent Mg(5) atoms.
NaMg14C crystallizes in the orthorhombic Amm2 space group. Na(1) is bonded in a 10-coordinate geometry to two equivalent Mg(6), four equivalent Mg(3), and four equivalent Mg(5) atoms. Both Na(1)-Mg(6) bond lengths are 3.10 Å. There are two shorter (3.25 Å) and two longer (3.39 Å) Na(1)-Mg(3) bond lengths. All Na(1)-Mg(5) bond lengths are 3.02 Å. There are seven inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(2), two equivalent Mg(6), four equivalent Mg(4), and four equivalent Mg(5) atoms to form a mixture of distorted edge, face, and corner-sharing MgMg12 cuboctahedra. Both Mg(1)-Mg(2) bond lengths are 3.11 Å. Both Mg(1)-Mg(6) bond lengths are 3.11 Å. There are two shorter (3.17 Å) and two longer (3.47 Å) Mg(1)-Mg(4) bond lengths. All Mg(1)-Mg(5) bond lengths are 3.26 Å. In the second Mg site, Mg(2) is bonded to two equivalent Mg(1), two equivalent Mg(7), four equivalent Mg(4), and four equivalent Mg(5) atoms to form a mixture of edge, face, and corner-sharing MgMg12 cuboctahedra. Both Mg(2)-Mg(7) bond lengths are 3.17 Å. There are two shorter (3.30 Å) and two longer (3.34 Å) Mg(2)-Mg(4) bond lengths. All Mg(2)-Mg(5) bond lengths are 3.19 Å. In the third Mg site, Mg(3) is bonded in a single-bond geometry to two equivalent Na(1), two equivalent Mg(6), two equivalent Mg(7), and one C(1) atom. Both Mg(3)-Mg(6) bond lengths are 3.17 Å. Both Mg(3)-Mg(7) bond lengths are 3.06 Å. The Mg(3)-C(1) bond length is 2.23 Å. In the fourth Mg site, Mg(4) is bonded to two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), two equivalent Mg(5), two equivalent Mg(6), and two equivalent Mg(7) atoms to form a mixture of distorted edge, face, and corner-sharing MgMg12 cuboctahedra. There is one shorter (3.08 Å) and one longer (3.14 Å) Mg(4)-Mg(4) bond length. Both Mg(4)-Mg(5) bond lengths are 3.28 Å. Both Mg(4)-Mg(6) bond lengths are 3.04 Å. Both Mg(4)-Mg(7) bond lengths are 3.18 Å. In the fifth Mg site, Mg(5) is bonded in a 1-coordinate geometry to one Na(1), one Mg(1), one Mg(2), one Mg(4), two equivalent Mg(6), two equivalent Mg(7), and one C(1) atom. There is one shorter (3.33 Å) and one longer (3.34 Å) Mg(5)-Mg(6) bond length. There is one shorter (3.22 Å) and one longer (3.42 Å) Mg(5)-Mg(7) bond length. The Mg(5)-C(1) bond length is 2.69 Å. In the sixth Mg site, Mg(6) is bonded in a 12-coordinate geometry to one Na(1), one Mg(1), two equivalent Mg(3), two equivalent Mg(4), two equivalent Mg(7), and four equivalent Mg(5) atoms. Both Mg(6)-Mg(7) bond lengths are 3.12 Å. In the seventh Mg site, Mg(7) is bonded in a 11-coordinate geometry to one Mg(2), two equivalent Mg(3), two equivalent Mg(4), two equivalent Mg(6), and four equivalent Mg(5) atoms. C(1) is bonded in a 6-coordinate geometry to two equivalent Mg(3) and four equivalent Mg(5) atoms.