Li3Eu2(BO3)3 crystallizes in the monoclinic P2_1 space group. There are three inequivalent Li sites. In the first Li site, Li(1) is bonded in a 4-coordinate geometry to one O(1), one O(3), one O(6), and one O(9) atom. In the second Li site, Li(2) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(5), and one O(9) atom. In the third Li site, Li(3) is bonded in a distorted trigonal planar geometry to one O(5), one O(7), and one O(9) atom. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to one O(3), one O(5), one O(7), and one O(8) atom to form distorted corner-sharing EuO4 tetrahedra. In the second Eu site, Eu(2) is bonded to one O(1), one O(6), one O(7), and one O(8) atom to form corner-sharing EuO4 tetrahedra. There are three inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(4), one O(5), and one O(6) atom. In the third B site, B(3) is bonded in a trigonal planar geometry to one O(2), one O(4), and one O(9) atom. There are nine inequivalent O sites. In the first O site, O(9) is bonded in a distorted see-saw-like geometry to one Li(1), one Li(2), one Li(3), and one B(3) atom. In the second O site, O(1) is bonded in a 1-coordinate geometry to one Li(1), one Li(2), one Eu(2), and one B(1) atom. In the third O site, O(2) is bonded in a 3-coordinate geometry to one Li(2), one B(1), and one B(3) atom. In the fourth O site, O(3) is bonded in a 3-coordinate geometry to one Li(1), one Eu(1), and one B(1) atom. In the fifth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one B(2) and one B(3) atom. In the sixth O site, O(5) is bonded in a distorted tetrahedral geometry to one Li(2), one Li(3), one Eu(1), and one B(2) atom. In the seventh O site, O(6) is bonded in a 3-coordinate geometry to one Li(1), one Eu(2), and one B(2) atom. In the eighth O site, O(7) is bonded in a trigonal planar geometry to one Li(3), one Eu(1), and one Eu(2) atom. In the ninth O site, O(8) is bonded in a bent 150 degrees geometry to one Eu(1) and one Eu(2) atom.
Li3Eu2(BO3)3 crystallizes in the monoclinic P2_1 space group. There are three inequivalent Li sites. In the first Li site, Li(1) is bonded in a 4-coordinate geometry to one O(1), one O(3), one O(6), and one O(9) atom. The Li(1)-O(1) bond length is 2.18 Å. The Li(1)-O(3) bond length is 1.97 Å. The Li(1)-O(6) bond length is 1.93 Å. The Li(1)-O(9) bond length is 1.90 Å. In the second Li site, Li(2) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(5), and one O(9) atom. The Li(2)-O(1) bond length is 2.42 Å. The Li(2)-O(2) bond length is 2.09 Å. The Li(2)-O(5) bond length is 1.94 Å. The Li(2)-O(9) bond length is 1.99 Å. In the third Li site, Li(3) is bonded in a distorted trigonal planar geometry to one O(5), one O(7), and one O(9) atom. The Li(3)-O(5) bond length is 2.03 Å. The Li(3)-O(7) bond length is 1.90 Å. The Li(3)-O(9) bond length is 1.98 Å. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to one O(3), one O(5), one O(7), and one O(8) atom to form distorted corner-sharing EuO4 tetrahedra. The Eu(1)-O(3) bond length is 2.40 Å. The Eu(1)-O(5) bond length is 2.42 Å. The Eu(1)-O(7) bond length is 2.22 Å. The Eu(1)-O(8) bond length is 2.11 Å. In the second Eu site, Eu(2) is bonded to one O(1), one O(6), one O(7), and one O(8) atom to form corner-sharing EuO4 tetrahedra. The Eu(2)-O(1) bond length is 2.33 Å. The Eu(2)-O(6) bond length is 2.35 Å. The Eu(2)-O(7) bond length is 2.18 Å. The Eu(2)-O(8) bond length is 2.13 Å. There are three inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. The B(1)-O(1) bond length is 1.36 Å. The B(1)-O(2) bond length is 1.44 Å. The B(1)-O(3) bond length is 1.36 Å. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(4), one O(5), and one O(6) atom. The B(2)-O(4) bond length is 1.42 Å. The B(2)-O(5) bond length is 1.38 Å. The B(2)-O(6) bond length is 1.36 Å. In the third B site, B(3) is bonded in a trigonal planar geometry to one O(2), one O(4), and one O(9) atom. The B(3)-O(2) bond length is 1.43 Å. The B(3)-O(4) bond length is 1.38 Å. The B(3)-O(9) bond length is 1.34 Å. There are nine inequivalent O sites. In the first O site, O(9) is bonded in a distorted see-saw-like geometry to one Li(1), one Li(2), one Li(3), and one B(3) atom. In the second O site, O(1) is bonded in a 1-coordinate geometry to one Li(1), one Li(2), one Eu(2), and one B(1) atom. In the third O site, O(2) is bonded in a 3-coordinate geometry to one Li(2), one B(1), and one B(3) atom. In the fourth O site, O(3) is bonded in a 3-coordinate geometry to one Li(1), one Eu(1), and one B(1) atom. In the fifth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one B(2) and one B(3) atom. In the sixth O site, O(5) is bonded in a distorted tetrahedral geometry to one Li(2), one Li(3), one Eu(1), and one B(2) atom. In the seventh O site, O(6) is bonded in a 3-coordinate geometry to one Li(1), one Eu(2), and one B(2) atom. In the eighth O site, O(7) is bonded in a trigonal planar geometry to one Li(3), one Eu(1), and one Eu(2) atom. In the ninth O site, O(8) is bonded in a bent 150 degrees geometry to one Eu(1) and one Eu(2) atom.