Mg6CrC crystallizes in the orthorhombic Amm2 space group. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 11-coordinate geometry to two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), two equivalent Cr(1), and one C(1) atom. In the second Mg site, Mg(2) is bonded in a 12-coordinate geometry to two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), two equivalent Cr(1), and two equivalent C(1) atoms. In the third Mg site, Mg(3) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(2), and two equivalent Cr(1) atoms to form a mixture of distorted face and corner-sharing MgMg10Cr2 cuboctahedra. In the fourth Mg site, Mg(4) is bonded in a distorted bent 120 degrees geometry to two equivalent Mg(3), four equivalent Mg(1), four equivalent Mg(2), and two equivalent C(1) atoms. Cr(1) is bonded in a distorted q6 geometry to two equivalent Mg(3), four equivalent Mg(1), and four equivalent Mg(2) atoms. C(1) is bonded in a 2-coordinate geometry to two equivalent Mg(1), two equivalent Mg(4), and four equivalent Mg(2) atoms.
Mg6CrC crystallizes in the orthorhombic Amm2 space group. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 11-coordinate geometry to two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), two equivalent Cr(1), and one C(1) atom. Both Mg(1)-Mg(1) bond lengths are 3.09 Å. Both Mg(1)-Mg(2) bond lengths are 2.96 Å. Both Mg(1)-Mg(3) bond lengths are 2.92 Å. Both Mg(1)-Mg(4) bond lengths are 2.94 Å. There is one shorter (3.02 Å) and one longer (3.06 Å) Mg(1)-Cr(1) bond length. The Mg(1)-C(1) bond length is 2.95 Å. In the second Mg site, Mg(2) is bonded in a 12-coordinate geometry to two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), two equivalent Cr(1), and two equivalent C(1) atoms. There is one shorter (2.97 Å) and one longer (3.20 Å) Mg(2)-Mg(2) bond length. There is one shorter (2.97 Å) and one longer (3.11 Å) Mg(2)-Mg(3) bond length. There is one shorter (2.86 Å) and one longer (3.22 Å) Mg(2)-Mg(4) bond length. Both Mg(2)-Cr(1) bond lengths are 2.93 Å. Both Mg(2)-C(1) bond lengths are 2.89 Å. In the third Mg site, Mg(3) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(2), and two equivalent Cr(1) atoms to form a mixture of distorted face and corner-sharing MgMg10Cr2 cuboctahedra. Both Mg(3)-Mg(4) bond lengths are 3.09 Å. Both Mg(3)-Cr(1) bond lengths are 2.87 Å. In the fourth Mg site, Mg(4) is bonded in a distorted bent 120 degrees geometry to two equivalent Mg(3), four equivalent Mg(1), four equivalent Mg(2), and two equivalent C(1) atoms. Both Mg(4)-C(1) bond lengths are 2.79 Å. Cr(1) is bonded in a distorted q6 geometry to two equivalent Mg(3), four equivalent Mg(1), and four equivalent Mg(2) atoms. C(1) is bonded in a 2-coordinate geometry to two equivalent Mg(1), two equivalent Mg(4), and four equivalent Mg(2) atoms.