Mg14MnC crystallizes in the orthorhombic Amm2 space group. There are seven inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 8-coordinate geometry to two equivalent Mg(6), two equivalent Mg(7), and four equivalent Mg(4) atoms. In the second Mg site, Mg(2) is bonded in a 10-coordinate geometry to two equivalent Mg(7), four equivalent Mg(4), and four equivalent Mg(5) atoms. In the third Mg site, Mg(3) is bonded in a single-bond geometry to two equivalent Mg(6), two equivalent Mn(1), and one C(1) atom. In the fourth Mg site, Mg(4) is bonded in a 11-coordinate geometry to one Mg(4), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(5), two equivalent Mg(6), and two equivalent Mg(7) atoms. In the fifth Mg site, Mg(5) is bonded in a distorted single-bond geometry to one Mg(2), one Mg(4), two equivalent Mg(6), one Mn(1), and one C(1) atom. In the sixth Mg site, Mg(6) is bonded in a 10-coordinate geometry to one Mg(1), two equivalent Mg(3), two equivalent Mg(4), four equivalent Mg(5), and one Mn(1) atom. In the seventh Mg site, Mg(7) is bonded in a 2-coordinate geometry to one Mg(1), one Mg(2), two equivalent Mg(4), one Mn(1), and one C(1) atom. Mn(1) is bonded to two equivalent Mg(6), two equivalent Mg(7), four equivalent Mg(3), and four equivalent Mg(5) atoms to form corner-sharing MnMg12 cuboctahedra. C(1) is bonded in a 8-coordinate geometry to two equivalent Mg(3), two equivalent Mg(7), and four equivalent Mg(5) atoms.
Mg14MnC crystallizes in the orthorhombic Amm2 space group. There are seven inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 8-coordinate geometry to two equivalent Mg(6), two equivalent Mg(7), and four equivalent Mg(4) atoms. Both Mg(1)-Mg(6) bond lengths are 3.03 Å. Both Mg(1)-Mg(7) bond lengths are 3.13 Å. There are two shorter (3.12 Å) and two longer (3.19 Å) Mg(1)-Mg(4) bond lengths. In the second Mg site, Mg(2) is bonded in a 10-coordinate geometry to two equivalent Mg(7), four equivalent Mg(4), and four equivalent Mg(5) atoms. Both Mg(2)-Mg(7) bond lengths are 3.23 Å. There are two shorter (3.13 Å) and two longer (3.17 Å) Mg(2)-Mg(4) bond lengths. All Mg(2)-Mg(5) bond lengths are 3.22 Å. In the third Mg site, Mg(3) is bonded in a single-bond geometry to two equivalent Mg(6), two equivalent Mn(1), and one C(1) atom. Both Mg(3)-Mg(6) bond lengths are 2.96 Å. There is one shorter (3.09 Å) and one longer (3.19 Å) Mg(3)-Mn(1) bond length. The Mg(3)-C(1) bond length is 2.24 Å. In the fourth Mg site, Mg(4) is bonded in a 11-coordinate geometry to one Mg(4), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(5), two equivalent Mg(6), and two equivalent Mg(7) atoms. The Mg(4)-Mg(4) bond length is 3.42 Å. Both Mg(4)-Mg(5) bond lengths are 3.52 Å. Both Mg(4)-Mg(6) bond lengths are 3.04 Å. Both Mg(4)-Mg(7) bond lengths are 3.16 Å. In the fifth Mg site, Mg(5) is bonded in a distorted single-bond geometry to one Mg(2), one Mg(4), two equivalent Mg(6), one Mn(1), and one C(1) atom. There is one shorter (3.19 Å) and one longer (3.29 Å) Mg(5)-Mg(6) bond length. The Mg(5)-Mn(1) bond length is 2.94 Å. The Mg(5)-C(1) bond length is 2.44 Å. In the sixth Mg site, Mg(6) is bonded in a 10-coordinate geometry to one Mg(1), two equivalent Mg(3), two equivalent Mg(4), four equivalent Mg(5), and one Mn(1) atom. The Mg(6)-Mn(1) bond length is 2.88 Å. In the seventh Mg site, Mg(7) is bonded in a 2-coordinate geometry to one Mg(1), one Mg(2), two equivalent Mg(4), one Mn(1), and one C(1) atom. The Mg(7)-Mn(1) bond length is 2.98 Å. The Mg(7)-C(1) bond length is 2.79 Å. Mn(1) is bonded to two equivalent Mg(6), two equivalent Mg(7), four equivalent Mg(3), and four equivalent Mg(5) atoms to form corner-sharing MnMg12 cuboctahedra. C(1) is bonded in a 8-coordinate geometry to two equivalent Mg(3), two equivalent Mg(7), and four equivalent Mg(5) atoms.