Mg14NiC crystallizes in the orthorhombic Amm2 space group. There are seven inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 10-coordinate geometry to two equivalent Mg(2), 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 12-coordinate geometry to two equivalent Mg(1), 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 distorted single-bond geometry to two equivalent Mg(7), one Ni(1), and one C(1) atom. In the fourth Mg site, Mg(4) is bonded in a 9-coordinate geometry to one Mg(4), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(6), and two equivalent Mg(7) atoms. In the fifth Mg site, Mg(5) is bonded in a distorted L-shaped geometry to one Mg(2), one Mg(7), one Ni(1), and one C(1) atom. In the sixth Mg site, Mg(6) is bonded in a distorted single-bond geometry to one Mg(1), two equivalent Mg(4), and one Ni(1) atom. In the seventh Mg site, Mg(7) is bonded in a 7-coordinate geometry to one Mg(1), one Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Mg(5) atoms. Ni(1) is bonded in a 8-coordinate geometry to two equivalent Mg(3), two equivalent Mg(6), and four equivalent Mg(5) atoms. C(1) is bonded in a distorted pentagonal pyramidal geometry to two equivalent Mg(3) and four equivalent Mg(5) atoms.
Mg14NiC crystallizes in the orthorhombic Amm2 space group. There are seven inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 10-coordinate geometry to two equivalent Mg(2), two equivalent Mg(6), two equivalent Mg(7), and four equivalent Mg(4) atoms. Both Mg(1)-Mg(2) bond lengths are 3.52 Å. Both Mg(1)-Mg(6) bond lengths are 3.08 Å. Both Mg(1)-Mg(7) bond lengths are 3.42 Å. There are two shorter (3.05 Å) and two longer (3.22 Å) Mg(1)-Mg(4) bond lengths. In the second Mg site, Mg(2) is bonded in a 12-coordinate geometry to two equivalent Mg(1), two equivalent Mg(7), four equivalent Mg(4), and four equivalent Mg(5) atoms. Both Mg(2)-Mg(7) bond lengths are 3.12 Å. There are two shorter (3.04 Å) and two longer (3.21 Å) Mg(2)-Mg(4) bond lengths. All Mg(2)-Mg(5) bond lengths are 3.40 Å. In the third Mg site, Mg(3) is bonded in a distorted single-bond geometry to two equivalent Mg(7), one Ni(1), and one C(1) atom. Both Mg(3)-Mg(7) bond lengths are 2.91 Å. The Mg(3)-Ni(1) bond length is 2.73 Å. The Mg(3)-C(1) bond length is 2.25 Å. In the fourth Mg site, Mg(4) is bonded in a 9-coordinate geometry to one Mg(4), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(6), and two equivalent Mg(7) atoms. The Mg(4)-Mg(4) bond length is 3.06 Å. Both Mg(4)-Mg(6) bond lengths are 3.01 Å. Both Mg(4)-Mg(7) bond lengths are 2.96 Å. In the fifth Mg site, Mg(5) is bonded in a distorted L-shaped geometry to one Mg(2), one Mg(7), one Ni(1), and one C(1) atom. The Mg(5)-Mg(7) bond length is 3.14 Å. The Mg(5)-Ni(1) bond length is 2.66 Å. The Mg(5)-C(1) bond length is 2.35 Å. In the sixth Mg site, Mg(6) is bonded in a distorted single-bond geometry to one Mg(1), two equivalent Mg(4), and one Ni(1) atom. The Mg(6)-Ni(1) bond length is 2.77 Å. In the seventh Mg site, Mg(7) is bonded in a 7-coordinate geometry to one Mg(1), one Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Mg(5) atoms. Ni(1) is bonded in a 8-coordinate geometry to two equivalent Mg(3), two equivalent Mg(6), and four equivalent Mg(5) atoms. C(1) is bonded in a distorted pentagonal pyramidal geometry to two equivalent Mg(3) and four equivalent Mg(5) atoms.