Cu(HCOO)2 crystallizes in the orthorhombic Pbca space group. Cu(1) is bonded to one O(1), one O(2), one O(4), and two equivalent O(3) atoms to form distorted edge-sharing CuO5 square pyramids. The Cu(1)-O(1) bond length is 1.96 Å. The Cu(1)-O(2) bond length is 1.98 Å. The Cu(1)-O(4) bond length is 1.96 Å. There is one shorter (2.00 Å) and one longer (2.50 Å) Cu(1)-O(3) bond length. There are two inequivalent C sites. In the first C site, C(2) is bonded in a trigonal planar geometry to one H(2), one O(2), and one O(4) atom. The C(2)-H(2) bond length is 1.10 Å. The C(2)-O(2) bond length is 1.27 Å. The C(2)-O(4) bond length is 1.27 Å. In the second C site, C(1) is bonded in a trigonal planar geometry to one H(1), one O(1), and one O(3) atom. The C(1)-H(1) bond length is 1.10 Å. The C(1)-O(1) bond length is 1.27 Å. The C(1)-O(3) bond length is 1.28 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(2) atom. There are four inequivalent O sites. In the first O site, O(4) is bonded in a bent 120 degrees geometry to one Cu(1) and one C(2) atom. In the second O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Cu(1) and one C(1) atom. In the third O site, O(2) is bonded in a bent 120 degrees geometry to one Cu(1) and one C(2) atom. In the fourth O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Cu(1) and one C(1) atom. Linkers: 16 [O]C=O. Metal clusters: 8 [Cu]. RCSR code: sql. The MOF has largest included sphere 1.68 A, density 2.54 g/cm3, surface area 2904.71 m2/g, accessible volume 0.06 cm3/g