LiBa2Eu(CuO2)4 crystallizes in the monoclinic Cm space group. Li(1) is bonded in a 4-coordinate geometry to two equivalent Cu(1), two equivalent O(2), and two equivalent O(4) atoms. Ba(1) is bonded in a 10-coordinate geometry to two equivalent O(2), two equivalent O(3), two equivalent O(4), and four equivalent O(1) atoms. Eu(1) is bonded in a 4-coordinate geometry to two equivalent O(2) and four equivalent O(4) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 6-coordinate geometry to one Li(1), one O(1), two equivalent O(2), and two equivalent O(4) atoms. In the second Cu site, Cu(2) is bonded in a square co-planar geometry to one O(1) and three equivalent O(3) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Ba(1), one Cu(1), and one Cu(2) atom to form distorted OBa4Cu2 octahedra that share corners with four equivalent O(1)Ba4Cu2 octahedra, corners with five equivalent O(3)Ba2Cu3 trigonal bipyramids, edges with four equivalent O(1)Ba4Cu2 octahedra, and faces with two equivalent O(3)Ba2Cu3 trigonal bipyramids. The corner-sharing octahedral tilt angles are 10°. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Li(1), two equivalent Ba(1), one Eu(1), and two equivalent Cu(1) atoms. In the third O site, O(3) is bonded to two equivalent Ba(1) and three equivalent Cu(2) atoms to form distorted OBa2Cu3 trigonal bipyramids that share corners with five equivalent O(1)Ba4Cu2 octahedra, corners with four equivalent O(3)Ba2Cu3 trigonal bipyramids, edges with two equivalent O(3)Ba2Cu3 trigonal bipyramids, and faces with two equivalent O(1)Ba4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-66°. In the fourth O site, O(4) is bonded in a 7-coordinate geometry to one Li(1), two equivalent Ba(1), two equivalent Eu(1), and two equivalent Cu(1) atoms.
LiBa2Eu(CuO2)4 crystallizes in the monoclinic Cm space group. Li(1) is bonded in a 4-coordinate geometry to two equivalent Cu(1), two equivalent O(2), and two equivalent O(4) atoms. Both Li(1)-Cu(1) bond lengths are 2.22 Å. Both Li(1)-O(2) bond lengths are 2.07 Å. Both Li(1)-O(4) bond lengths are 2.08 Å. Ba(1) is bonded in a 10-coordinate geometry to two equivalent O(2), two equivalent O(3), two equivalent O(4), and four equivalent O(1) atoms. There is one shorter (2.96 Å) and one longer (3.10 Å) Ba(1)-O(2) bond length. There is one shorter (2.94 Å) and one longer (3.00 Å) Ba(1)-O(3) bond length. There is one shorter (2.95 Å) and one longer (3.06 Å) Ba(1)-O(4) bond length. There are a spread of Ba(1)-O(1) bond distances ranging from 2.81-2.95 Å. Eu(1) is bonded in a 4-coordinate geometry to two equivalent O(2) and four equivalent O(4) atoms. Both Eu(1)-O(2) bond lengths are 2.34 Å. There are two shorter (2.35 Å) and two longer (2.75 Å) Eu(1)-O(4) bond lengths. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 6-coordinate geometry to one Li(1), one O(1), two equivalent O(2), and two equivalent O(4) atoms. The Cu(1)-O(1) bond length is 2.07 Å. There is one shorter (2.04 Å) and one longer (2.06 Å) Cu(1)-O(2) bond length. There is one shorter (2.05 Å) and one longer (2.08 Å) Cu(1)-O(4) bond length. In the second Cu site, Cu(2) is bonded in a square co-planar geometry to one O(1) and three equivalent O(3) atoms. The Cu(2)-O(1) bond length is 1.84 Å. There are a spread of Cu(2)-O(3) bond distances ranging from 1.88-2.01 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Ba(1), one Cu(1), and one Cu(2) atom to form distorted OBa4Cu2 octahedra that share corners with four equivalent O(1)Ba4Cu2 octahedra, corners with five equivalent O(3)Ba2Cu3 trigonal bipyramids, edges with four equivalent O(1)Ba4Cu2 octahedra, and faces with two equivalent O(3)Ba2Cu3 trigonal bipyramids. The corner-sharing octahedral tilt angles are 10°. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Li(1), two equivalent Ba(1), one Eu(1), and two equivalent Cu(1) atoms. In the third O site, O(3) is bonded to two equivalent Ba(1) and three equivalent Cu(2) atoms to form distorted OBa2Cu3 trigonal bipyramids that share corners with five equivalent O(1)Ba4Cu2 octahedra, corners with four equivalent O(3)Ba2Cu3 trigonal bipyramids, edges with two equivalent O(3)Ba2Cu3 trigonal bipyramids, and faces with two equivalent O(1)Ba4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-66°. In the fourth O site, O(4) is bonded in a 7-coordinate geometry to one Li(1), two equivalent Ba(1), two equivalent Eu(1), and two equivalent Cu(1) atoms.