UCu2(PO5)2 crystallizes in the monoclinic C2/m space group. U(1) is bonded to two equivalent O(3) and four equivalent O(2) atoms to form UO6 octahedra that share corners with four equivalent P(1)O4 tetrahedra. Cu(1) is bonded in a distorted square co-planar geometry to two equivalent O(1) and two equivalent O(4) atoms. P(1) is bonded to one O(1), one O(4), and two equivalent O(2) atoms to form PO4 tetrahedra that share corners with two equivalent U(1)O6 octahedra. The corner-sharing octahedral tilt angles are 26°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Cu(1) and one P(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one U(1) and one P(1) atom. In the third O site, O(3) is bonded in a single-bond geometry to one U(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Cu(1) and one P(1) atom.
UCu2(PO5)2 crystallizes in the monoclinic C2/m space group. U(1) is bonded to two equivalent O(3) and four equivalent O(2) atoms to form UO6 octahedra that share corners with four equivalent P(1)O4 tetrahedra. Both U(1)-O(3) bond lengths are 1.83 Å. All U(1)-O(2) bond lengths are 2.27 Å. Cu(1) is bonded in a distorted square co-planar geometry to two equivalent O(1) and two equivalent O(4) atoms. Both Cu(1)-O(1) bond lengths are 1.98 Å. Both Cu(1)-O(4) bond lengths are 1.99 Å. P(1) is bonded to one O(1), one O(4), and two equivalent O(2) atoms to form PO4 tetrahedra that share corners with two equivalent U(1)O6 octahedra. The corner-sharing octahedral tilt angles are 26°. The P(1)-O(1) bond length is 1.58 Å. The P(1)-O(4) bond length is 1.57 Å. Both P(1)-O(2) bond lengths are 1.52 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Cu(1) and one P(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one U(1) and one P(1) atom. In the third O site, O(3) is bonded in a single-bond geometry to one U(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Cu(1) and one P(1) atom.