Eu2Mn5Al12 crystallizes in the trigonal R-3m space group. Eu(1) is bonded in a 13-coordinate geometry to one Mn(2), six equivalent Al(1), and nine equivalent Al(2) atoms. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 8-coordinate geometry to two equivalent Mn(2), four equivalent Al(1), and four equivalent Al(2) atoms. In the second Mn site, Mn(2) is bonded in a 14-coordinate geometry to one Eu(1), one Mn(2), three equivalent Mn(1), three equivalent Al(2), and six equivalent Al(1) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent Eu(1), two equivalent Mn(1), two equivalent Mn(2), two equivalent Al(1), and four equivalent Al(2) atoms to form a mixture of distorted edge, corner, and face-sharing AlEu2Mn4Al6 cuboctahedra. In the second Al site, Al(2) is bonded in a 12-coordinate geometry to three equivalent Eu(1), one Mn(2), two equivalent Mn(1), two equivalent Al(2), and four equivalent Al(1) atoms.
Eu2Mn5Al12 crystallizes in the trigonal R-3m space group. Eu(1) is bonded in a 13-coordinate geometry to one Mn(2), six equivalent Al(1), and nine equivalent Al(2) atoms. The Eu(1)-Mn(2) bond length is 3.22 Å. All Eu(1)-Al(1) bond lengths are 3.29 Å. There are a spread of Eu(1)-Al(2) bond distances ranging from 3.18-3.65 Å. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 8-coordinate geometry to two equivalent Mn(2), four equivalent Al(1), and four equivalent Al(2) atoms. Both Mn(1)-Mn(2) bond lengths are 2.78 Å. All Mn(1)-Al(1) bond lengths are 2.57 Å. All Mn(1)-Al(2) bond lengths are 2.53 Å. In the second Mn site, Mn(2) is bonded in a 14-coordinate geometry to one Eu(1), one Mn(2), three equivalent Mn(1), three equivalent Al(2), and six equivalent Al(1) atoms. The Mn(2)-Mn(2) bond length is 2.56 Å. All Mn(2)-Al(2) bond lengths are 2.65 Å. All Mn(2)-Al(1) bond lengths are 2.87 Å. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent Eu(1), two equivalent Mn(1), two equivalent Mn(2), two equivalent Al(1), and four equivalent Al(2) atoms to form a mixture of distorted edge, corner, and face-sharing AlEu2Mn4Al6 cuboctahedra. Both Al(1)-Al(1) bond lengths are 2.57 Å. There are two shorter (2.73 Å) and two longer (2.80 Å) Al(1)-Al(2) bond lengths. In the second Al site, Al(2) is bonded in a 12-coordinate geometry to three equivalent Eu(1), one Mn(2), two equivalent Mn(1), two equivalent Al(2), and four equivalent Al(1) atoms. Both Al(2)-Al(2) bond lengths are 2.89 Å.