Al11Mn4 crystallizes in the triclinic P-1 space group. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 11-coordinate geometry to one Mn(1), one Al(4), one Al(5), two equivalent Al(2), three equivalent Al(3), and three equivalent Al(6) atoms. In the second Mn site, Mn(2) is bonded in a 10-coordinate geometry to one Al(1), one Al(2), one Al(3), one Al(6), three equivalent Al(4), and three equivalent Al(5) atoms. There are six inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent Mn(2), two equivalent Al(2), four equivalent Al(4), and four equivalent Al(5) atoms to form distorted edge-sharing AlMn2Al10 cuboctahedra. In the second Al site, Al(2) is bonded in a 10-coordinate geometry to one Mn(2), two equivalent Mn(1), one Al(1), one Al(5), two equivalent Al(6), and three equivalent Al(3) atoms. In the third Al site, Al(3) is bonded in a 12-coordinate geometry to one Mn(2), three equivalent Mn(1), one Al(4), one Al(5), three equivalent Al(2), and three equivalent Al(6) atoms. In the fourth Al site, Al(4) is bonded in a 11-coordinate geometry to one Mn(1), three equivalent Mn(2), one Al(3), one Al(4), one Al(6), two equivalent Al(1), and two equivalent Al(5) atoms. In the fifth Al site, Al(5) is bonded in a 12-coordinate geometry to one Mn(1), three equivalent Mn(2), one Al(2), one Al(3), one Al(5), one Al(6), two equivalent Al(1), and two equivalent Al(4) atoms. In the sixth Al site, Al(6) is bonded in a 10-coordinate geometry to one Mn(2), three equivalent Mn(1), one Al(4), one Al(5), one Al(6), two equivalent Al(2), and three equivalent Al(3) atoms.
Al11Mn4 crystallizes in the triclinic P-1 space group. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 11-coordinate geometry to one Mn(1), one Al(4), one Al(5), two equivalent Al(2), three equivalent Al(3), and three equivalent Al(6) atoms. The Mn(1)-Mn(1) bond length is 2.71 Å. The Mn(1)-Al(4) bond length is 2.75 Å. The Mn(1)-Al(5) bond length is 2.71 Å. There is one shorter (2.46 Å) and one longer (2.84 Å) Mn(1)-Al(2) bond length. There are a spread of Mn(1)-Al(3) bond distances ranging from 2.56-2.68 Å. There are a spread of Mn(1)-Al(6) bond distances ranging from 2.55-2.71 Å. In the second Mn site, Mn(2) is bonded in a 10-coordinate geometry to one Al(1), one Al(2), one Al(3), one Al(6), three equivalent Al(4), and three equivalent Al(5) atoms. The Mn(2)-Al(1) bond length is 2.41 Å. The Mn(2)-Al(2) bond length is 2.52 Å. The Mn(2)-Al(3) bond length is 2.57 Å. The Mn(2)-Al(6) bond length is 2.57 Å. There are a spread of Mn(2)-Al(4) bond distances ranging from 2.53-2.71 Å. There are a spread of Mn(2)-Al(5) bond distances ranging from 2.55-2.72 Å. There are six inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent Mn(2), two equivalent Al(2), four equivalent Al(4), and four equivalent Al(5) atoms to form distorted edge-sharing AlMn2Al10 cuboctahedra. Both Al(1)-Al(2) bond lengths are 2.72 Å. There are two shorter (2.82 Å) and two longer (2.92 Å) Al(1)-Al(4) bond lengths. There are two shorter (2.83 Å) and two longer (2.86 Å) Al(1)-Al(5) bond lengths. In the second Al site, Al(2) is bonded in a 10-coordinate geometry to one Mn(2), two equivalent Mn(1), one Al(1), one Al(5), two equivalent Al(6), and three equivalent Al(3) atoms. The Al(2)-Al(5) bond length is 2.88 Å. There is one shorter (2.62 Å) and one longer (2.71 Å) Al(2)-Al(6) bond length. There are a spread of Al(2)-Al(3) bond distances ranging from 2.63-2.83 Å. In the third Al site, Al(3) is bonded in a 12-coordinate geometry to one Mn(2), three equivalent Mn(1), one Al(4), one Al(5), three equivalent Al(2), and three equivalent Al(6) atoms. The Al(3)-Al(4) bond length is 2.62 Å. The Al(3)-Al(5) bond length is 2.95 Å. There are a spread of Al(3)-Al(6) bond distances ranging from 2.68-3.11 Å. In the fourth Al site, Al(4) is bonded in a 11-coordinate geometry to one Mn(1), three equivalent Mn(2), one Al(3), one Al(4), one Al(6), two equivalent Al(1), and two equivalent Al(5) atoms. The Al(4)-Al(4) bond length is 2.64 Å. The Al(4)-Al(6) bond length is 2.78 Å. There is one shorter (2.79 Å) and one longer (2.98 Å) Al(4)-Al(5) bond length. In the fifth Al site, Al(5) is bonded in a 12-coordinate geometry to one Mn(1), three equivalent Mn(2), one Al(2), one Al(3), one Al(5), one Al(6), two equivalent Al(1), and two equivalent Al(4) atoms. The Al(5)-Al(5) bond length is 2.72 Å. The Al(5)-Al(6) bond length is 2.66 Å. In the sixth Al site, Al(6) is bonded in a 10-coordinate geometry to one Mn(2), three equivalent Mn(1), one Al(4), one Al(5), one Al(6), two equivalent Al(2), and three equivalent Al(3) atoms. The Al(6)-Al(6) bond length is 2.66 Å.