Eu2AlNO3 is (La,Ba)CuO4-derived structured and crystallizes in the tetragonal I4mm space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 9-coordinate geometry to four equivalent N(1), one O(2), and four equivalent O(1) atoms. In the second Eu site, Eu(2) is bonded in a 9-coordinate geometry to one N(1), four equivalent O(1), and four equivalent O(2) atoms. Al(1) is bonded to one N(1), one O(2), and four equivalent O(1) atoms to form corner-sharing AlNO5 octahedra. The corner-sharing octahedral tilt angles are 1°. N(1) is bonded to one Eu(2), four equivalent Eu(1), and one Al(1) atom to form NEu5Al octahedra that share  a cornercorner with one O(2)Eu5Al octahedra, corners with four equivalent N(1)Eu5Al octahedra, corners with twelve equivalent O(1)Eu4Al2 octahedra, edges with four equivalent N(1)Eu5Al octahedra, edges with four equivalent O(2)Eu5Al octahedra, and faces with four equivalent O(1)Eu4Al2 octahedra. The corner-sharing octahedral tilt angles range from 0-55°. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Eu(1), two equivalent Eu(2), and two equivalent Al(1) atoms to form distorted OEu4Al2 octahedra that share corners with two equivalent O(1)Eu4Al2 octahedra, corners with six equivalent N(1)Eu5Al octahedra, corners with six equivalent O(2)Eu5Al octahedra, edges with two equivalent O(1)Eu4Al2 octahedra, faces with two equivalent N(1)Eu5Al octahedra, faces with two equivalent O(2)Eu5Al octahedra, and faces with four equivalent O(1)Eu4Al2 octahedra. The corner-sharing octahedral tilt angles range from 1-55°. In the second O site, O(2) is bonded to one Eu(1), four equivalent Eu(2), and one Al(1) atom to form distorted OEu5Al octahedra that share  a cornercorner with one N(1)Eu5Al octahedra, corners with four equivalent O(2)Eu5Al octahedra, corners with twelve equivalent O(1)Eu4Al2 octahedra, edges with four equivalent N(1)Eu5Al octahedra, edges with four equivalent O(2)Eu5Al octahedra, and faces with four equivalent O(1)Eu4Al2 octahedra. The corner-sharing octahedral tilt angles range from 0-54°.
Eu2AlNO3 is (La,Ba)CuO4-derived structured and crystallizes in the tetragonal I4mm space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 9-coordinate geometry to four equivalent N(1), one O(2), and four equivalent O(1) atoms. All Eu(1)-N(1) bond lengths are 2.66 Å. The Eu(1)-O(2) bond length is 2.39 Å. All Eu(1)-O(1) bond lengths are 2.61 Å. In the second Eu site, Eu(2) is bonded in a 9-coordinate geometry to one N(1), four equivalent O(1), and four equivalent O(2) atoms. The Eu(2)-N(1) bond length is 2.36 Å. All Eu(2)-O(1) bond lengths are 2.56 Å. All Eu(2)-O(2) bond lengths are 2.66 Å. Al(1) is bonded to one N(1), one O(2), and four equivalent O(1) atoms to form corner-sharing AlNO5 octahedra. The corner-sharing octahedral tilt angles are 1°. The Al(1)-N(1) bond length is 2.10 Å. The Al(1)-O(2) bond length is 2.03 Å. All Al(1)-O(1) bond lengths are 1.87 Å. N(1) is bonded to one Eu(2), four equivalent Eu(1), and one Al(1) atom to form NEu5Al octahedra that share  a cornercorner with one O(2)Eu5Al octahedra, corners with four equivalent N(1)Eu5Al octahedra, corners with twelve equivalent O(1)Eu4Al2 octahedra, edges with four equivalent N(1)Eu5Al octahedra, edges with four equivalent O(2)Eu5Al octahedra, and faces with four equivalent O(1)Eu4Al2 octahedra. The corner-sharing octahedral tilt angles range from 0-55°. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Eu(1), two equivalent Eu(2), and two equivalent Al(1) atoms to form distorted OEu4Al2 octahedra that share corners with two equivalent O(1)Eu4Al2 octahedra, corners with six equivalent N(1)Eu5Al octahedra, corners with six equivalent O(2)Eu5Al octahedra, edges with two equivalent O(1)Eu4Al2 octahedra, faces with two equivalent N(1)Eu5Al octahedra, faces with two equivalent O(2)Eu5Al octahedra, and faces with four equivalent O(1)Eu4Al2 octahedra. The corner-sharing octahedral tilt angles range from 1-55°. In the second O site, O(2) is bonded to one Eu(1), four equivalent Eu(2), and one Al(1) atom to form distorted OEu5Al octahedra that share  a cornercorner with one N(1)Eu5Al octahedra, corners with four equivalent O(2)Eu5Al octahedra, corners with twelve equivalent O(1)Eu4Al2 octahedra, edges with four equivalent N(1)Eu5Al octahedra, edges with four equivalent O(2)Eu5Al octahedra, and faces with four equivalent O(1)Eu4Al2 octahedra. The corner-sharing octahedral tilt angles range from 0-54°.