Eu2(AgAl)5 crystallizes in the orthorhombic Pmmm space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a distorted hexagonal planar geometry to two equivalent Ag(1) and four equivalent Ag(2) atoms. In the second Eu site, Eu(2) is bonded in a 18-coordinate geometry to two equivalent Ag(2), four equivalent Ag(1), four equivalent Ag(3), and eight equivalent Al(2) atoms. There are three inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a 9-coordinate geometry to one Eu(1), two equivalent Eu(2), two equivalent Ag(3), and four equivalent Al(2) atoms. In the second Ag site, Ag(2) is bonded in a 9-coordinate geometry to one Eu(2), two equivalent Eu(1), two equivalent Al(1), and four equivalent Al(2) atoms. In the third Ag site, Ag(3) is bonded to four equivalent Eu(2), four equivalent Ag(1), and four equivalent Al(2) atoms to form a mixture of distorted corner, edge, and face-sharing AgEu4Al4Ag4 cuboctahedra. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to four equivalent Ag(2) atoms to form distorted edge-sharing AlAg4 cuboctahedra. In the second Al site, Al(2) is bonded in a 5-coordinate geometry to two equivalent Eu(2), one Ag(3), two equivalent Ag(1), and two equivalent Ag(2) atoms.
Eu2(AgAl)5 crystallizes in the orthorhombic Pmmm space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a distorted hexagonal planar geometry to two equivalent Ag(1) and four equivalent Ag(2) atoms. Both Eu(1)-Ag(1) bond lengths are 3.14 Å. All Eu(1)-Ag(2) bond lengths are 3.20 Å. In the second Eu site, Eu(2) is bonded in a 18-coordinate geometry to two equivalent Ag(2), four equivalent Ag(1), four equivalent Ag(3), and eight equivalent Al(2) atoms. Both Eu(2)-Ag(2) bond lengths are 3.24 Å. All Eu(2)-Ag(1) bond lengths are 3.25 Å. All Eu(2)-Ag(3) bond lengths are 3.53 Å. All Eu(2)-Al(2) bond lengths are 3.54 Å. There are three inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a 9-coordinate geometry to one Eu(1), two equivalent Eu(2), two equivalent Ag(3), and four equivalent Al(2) atoms. Both Ag(1)-Ag(3) bond lengths are 2.82 Å. All Ag(1)-Al(2) bond lengths are 2.70 Å. In the second Ag site, Ag(2) is bonded in a 9-coordinate geometry to one Eu(2), two equivalent Eu(1), two equivalent Al(1), and four equivalent Al(2) atoms. Both Ag(2)-Al(1) bond lengths are 2.75 Å. All Ag(2)-Al(2) bond lengths are 2.73 Å. In the third Ag site, Ag(3) is bonded to four equivalent Eu(2), four equivalent Ag(1), and four equivalent Al(2) atoms to form a mixture of distorted corner, edge, and face-sharing AgEu4Al4Ag4 cuboctahedra. All Ag(3)-Al(2) bond lengths are 2.78 Å. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to four equivalent Ag(2) atoms to form distorted edge-sharing AlAg4 cuboctahedra. In the second Al site, Al(2) is bonded in a 5-coordinate geometry to two equivalent Eu(2), one Ag(3), two equivalent Ag(1), and two equivalent Ag(2) atoms.