Cu2C5P2O6 crystallizes in the orthorhombic Pmmn space group. Cu(1) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Cu(1)-O(1) bond lengths are 1.94 Å. Both Cu(1)-O(2) bond lengths are 2.02 Å. There are three inequivalent C sites. In the first C site, C(1) is bonded in a distorted single-bond geometry to one C(2) and one P(1) atom. The C(1)-C(2) bond length is 1.59 Å. The C(1)-P(1) bond length is 1.82 Å. In the second C site, C(2) is bonded in a water-like geometry to one C(1) and one C(3) atom. The C(2)-C(3) bond length is 1.49 Å. In the third C site, C(3) is bonded in a bent 120 degrees geometry to two equivalent C(2) atoms. P(1) is bonded in a tetrahedral geometry to one C(1), one O(2), and two equivalent O(1) atoms. The P(1)-O(2) bond length is 1.57 Å. Both P(1)-O(1) bond lengths are 1.52 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Cu(1) and one P(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to two equivalent Cu(1) and one P(1) atom. Linkers: 2 [O]P([O])(=O)[C][C][C][C][C]P([O])([O])=O. Metal clusters: 4 [Cu]. The MOF has largest included sphere 4.49 A, density 1.74 g/cm3, surface area 2999.01 m2/g, accessible volume 0.30 cm3/g