LiBa2Eu(CuO2)4 crystallizes in the triclinic P1 space group. Li(1) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(4), and two equivalent O(7) atoms. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 10-coordinate geometry to two equivalent O(3), two equivalent O(5), two equivalent O(8), and four equivalent O(2) atoms. In the second Ba site, Ba(2) is bonded in a 6-coordinate geometry to two equivalent O(6) and four equivalent O(1) atoms. Eu(1) is bonded in a distorted body-centered cubic geometry to two equivalent O(3), two equivalent O(4), two equivalent O(7), and two equivalent O(8) atoms. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a rectangular see-saw-like geometry to two equivalent O(4) and two equivalent O(7) atoms. In the second Cu site, Cu(2) is bonded to one O(2), two equivalent O(3), and two equivalent O(8) atoms to form corner-sharing CuO5 square pyramids. In the third Cu site, Cu(3) is bonded in a square co-planar geometry to one O(1), one O(5), and two equivalent O(6) atoms. In the fourth Cu site, Cu(4) is bonded in a square co-planar geometry to one O(2), one O(6), and two equivalent O(5) atoms. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Li(1), four equivalent Ba(2), and one Cu(3) atom to form distorted OBa4LiCu octahedra that share corners with two equivalent O(4)Li2Eu2Cu2 octahedra, corners with two equivalent O(7)Li2Eu2Cu2 octahedra, corners with four equivalent O(1)Ba4LiCu octahedra, corners with four equivalent O(6)Ba2Cu3 trigonal bipyramids, edges with four equivalent O(1)Ba4LiCu octahedra, and faces with two equivalent O(6)Ba2Cu3 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 4-64°. In the second O site, O(2) is bonded to four equivalent Ba(1), one Cu(2), and one Cu(4) atom to form distorted OBa4Cu2 octahedra that share corners with four equivalent O(2)Ba4Cu2 octahedra,  a cornercorner with one O(6)Ba2Cu3 trigonal bipyramid, and edges with four equivalent O(2)Ba4Cu2 octahedra. The corner-sharing octahedral tilt angles are 12°. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Ba(1), two equivalent Eu(1), and two equivalent Cu(2) atoms. In the fourth O site, O(4) is bonded to two equivalent Li(1), two equivalent Eu(1), and two equivalent Cu(1) atoms to form distorted OLi2Eu2Cu2 octahedra that share corners with two equivalent O(1)Ba4LiCu octahedra, corners with two equivalent O(4)Li2Eu2Cu2 octahedra, edges with two equivalent O(4)Li2Eu2Cu2 octahedra, and faces with four equivalent O(7)Li2Eu2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 6-64°. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to two equivalent Ba(1), one Cu(3), and two equivalent Cu(4) atoms. In the sixth O site, O(6) is bonded to two equivalent Ba(2), one Cu(4), and two equivalent Cu(3) atoms to form distorted OBa2Cu3 trigonal bipyramids that share  a cornercorner with one O(2)Ba4Cu2 octahedra, corners with four equivalent O(1)Ba4LiCu octahedra, corners with four equivalent O(6)Ba2Cu3 trigonal bipyramids, and faces with two equivalent O(1)Ba4LiCu octahedra. The corner-sharing octahedral tilt angles range from 0-59°. In the seventh O site, O(7) is bonded to two equivalent Li(1), two equivalent Eu(1), and two equivalent Cu(1) atoms to form distorted OLi2Eu2Cu2 octahedra that share corners with two equivalent O(1)Ba4LiCu octahedra, corners with two equivalent O(7)Li2Eu2Cu2 octahedra, edges with two equivalent O(7)Li2Eu2Cu2 octahedra, and faces with four equivalent O(4)Li2Eu2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 5-64°. In the eighth O site, O(8) is bonded in a 6-coordinate geometry to two equivalent Ba(1), two equivalent Eu(1), and two equivalent Cu(2) atoms.
LiBa2Eu(CuO2)4 crystallizes in the triclinic P1 space group. Li(1) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(4), and two equivalent O(7) atoms. The Li(1)-O(1) bond length is 1.96 Å. There is one shorter (2.12 Å) and one longer (2.25 Å) Li(1)-O(4) bond length. There is one shorter (2.11 Å) and one longer (2.31 Å) Li(1)-O(7) bond length. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 10-coordinate geometry to two equivalent O(3), two equivalent O(5), two equivalent O(8), and four equivalent O(2) atoms. Both Ba(1)-O(3) bond lengths are 2.97 Å. There is one shorter (2.98 Å) and one longer (2.99 Å) Ba(1)-O(5) bond length. There is one shorter (2.98 Å) and one longer (3.00 Å) Ba(1)-O(8) bond length. There is one shorter (2.78 Å) and three longer (2.79 Å) Ba(1)-O(2) bond lengths. In the second Ba site, Ba(2) is bonded in a 6-coordinate geometry to two equivalent O(6) and four equivalent O(1) atoms. Both Ba(2)-O(6) bond lengths are 2.75 Å. There are a spread of Ba(2)-O(1) bond distances ranging from 2.76-2.79 Å. Eu(1) is bonded in a distorted body-centered cubic geometry to two equivalent O(3), two equivalent O(4), two equivalent O(7), and two equivalent O(8) atoms. Both Eu(1)-O(3) bond lengths are 2.43 Å. There is one shorter (2.61 Å) and one longer (2.67 Å) Eu(1)-O(4) bond length. There is one shorter (2.62 Å) and one longer (2.67 Å) Eu(1)-O(7) bond length. Both Eu(1)-O(8) bond lengths are 2.44 Å. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a rectangular see-saw-like geometry to two equivalent O(4) and two equivalent O(7) atoms. There is one shorter (1.97 Å) and one longer (1.98 Å) Cu(1)-O(4) bond length. Both Cu(1)-O(7) bond lengths are 1.95 Å. In the second Cu site, Cu(2) is bonded to one O(2), two equivalent O(3), and two equivalent O(8) atoms to form corner-sharing CuO5 square pyramids. The Cu(2)-O(2) bond length is 2.35 Å. Both Cu(2)-O(3) bond lengths are 1.98 Å. Both Cu(2)-O(8) bond lengths are 1.96 Å. In the third Cu site, Cu(3) is bonded in a square co-planar geometry to one O(1), one O(5), and two equivalent O(6) atoms. The Cu(3)-O(1) bond length is 1.91 Å. The Cu(3)-O(5) bond length is 1.89 Å. Both Cu(3)-O(6) bond lengths are 1.98 Å. In the fourth Cu site, Cu(4) is bonded in a square co-planar geometry to one O(2), one O(6), and two equivalent O(5) atoms. The Cu(4)-O(2) bond length is 1.84 Å. The Cu(4)-O(6) bond length is 1.90 Å. Both Cu(4)-O(5) bond lengths are 1.98 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Li(1), four equivalent Ba(2), and one Cu(3) atom to form distorted OBa4LiCu octahedra that share corners with two equivalent O(4)Li2Eu2Cu2 octahedra, corners with two equivalent O(7)Li2Eu2Cu2 octahedra, corners with four equivalent O(1)Ba4LiCu octahedra, corners with four equivalent O(6)Ba2Cu3 trigonal bipyramids, edges with four equivalent O(1)Ba4LiCu octahedra, and faces with two equivalent O(6)Ba2Cu3 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 4-64°. In the second O site, O(2) is bonded to four equivalent Ba(1), one Cu(2), and one Cu(4) atom to form distorted OBa4Cu2 octahedra that share corners with four equivalent O(2)Ba4Cu2 octahedra,  a cornercorner with one O(6)Ba2Cu3 trigonal bipyramid, and edges with four equivalent O(2)Ba4Cu2 octahedra. The corner-sharing octahedral tilt angles are 12°. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Ba(1), two equivalent Eu(1), and two equivalent Cu(2) atoms. In the fourth O site, O(4) is bonded to two equivalent Li(1), two equivalent Eu(1), and two equivalent Cu(1) atoms to form distorted OLi2Eu2Cu2 octahedra that share corners with two equivalent O(1)Ba4LiCu octahedra, corners with two equivalent O(4)Li2Eu2Cu2 octahedra, edges with two equivalent O(4)Li2Eu2Cu2 octahedra, and faces with four equivalent O(7)Li2Eu2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 6-64°. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to two equivalent Ba(1), one Cu(3), and two equivalent Cu(4) atoms. In the sixth O site, O(6) is bonded to two equivalent Ba(2), one Cu(4), and two equivalent Cu(3) atoms to form distorted OBa2Cu3 trigonal bipyramids that share  a cornercorner with one O(2)Ba4Cu2 octahedra, corners with four equivalent O(1)Ba4LiCu octahedra, corners with four equivalent O(6)Ba2Cu3 trigonal bipyramids, and faces with two equivalent O(1)Ba4LiCu octahedra. The corner-sharing octahedral tilt angles range from 0-59°. In the seventh O site, O(7) is bonded to two equivalent Li(1), two equivalent Eu(1), and two equivalent Cu(1) atoms to form distorted OLi2Eu2Cu2 octahedra that share corners with two equivalent O(1)Ba4LiCu octahedra, corners with two equivalent O(7)Li2Eu2Cu2 octahedra, edges with two equivalent O(7)Li2Eu2Cu2 octahedra, and faces with four equivalent O(4)Li2Eu2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 5-64°. In the eighth O site, O(8) is bonded in a 6-coordinate geometry to two equivalent Ba(1), two equivalent Eu(1), and two equivalent Cu(2) atoms.