CaEu2(CuO3)2 crystallizes in the monoclinic C2/c space group. Ca(1) is bonded in a 8-coordinate geometry to four equivalent O(2) and four equivalent O(3) atoms. Eu(1) is bonded in a 7-coordinate geometry to one O(2), two equivalent O(3), and four equivalent O(1) atoms. Cu(1) is bonded in a rectangular see-saw-like geometry to one O(1), one O(3), and two equivalent O(2) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Eu(1) and one Cu(1) atom to form a mixture of distorted edge and corner-sharing OEu4Cu trigonal bipyramids. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Ca(1), one Eu(1), and two equivalent Cu(1) atoms. In the third O site, O(3) is bonded in a 5-coordinate geometry to two equivalent Ca(1), two equivalent Eu(1), and one Cu(1) atom.
CaEu2(CuO3)2 crystallizes in the monoclinic C2/c space group. Ca(1) is bonded in a 8-coordinate geometry to four equivalent O(2) and four equivalent O(3) atoms. There are two shorter (2.33 Å) and two longer (2.84 Å) Ca(1)-O(2) bond lengths. There are two shorter (2.38 Å) and two longer (2.63 Å) Ca(1)-O(3) bond lengths. Eu(1) is bonded in a 7-coordinate geometry to one O(2), two equivalent O(3), and four equivalent O(1) atoms. The Eu(1)-O(2) bond length is 2.53 Å. There is one shorter (2.38 Å) and one longer (2.57 Å) Eu(1)-O(3) bond length. There are a spread of Eu(1)-O(1) bond distances ranging from 2.40-2.59 Å. Cu(1) is bonded in a rectangular see-saw-like geometry to one O(1), one O(3), and two equivalent O(2) atoms. The Cu(1)-O(1) bond length is 1.94 Å. The Cu(1)-O(3) bond length is 1.90 Å. There is one shorter (1.91 Å) and one longer (1.93 Å) Cu(1)-O(2) bond length. There are three inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Eu(1) and one Cu(1) atom to form a mixture of distorted edge and corner-sharing OEu4Cu trigonal bipyramids. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Ca(1), one Eu(1), and two equivalent Cu(1) atoms. In the third O site, O(3) is bonded in a 5-coordinate geometry to two equivalent Ca(1), two equivalent Eu(1), and one Cu(1) atom.