K2Ru2CoH4(C2O7)2 crystallizes in the orthorhombic Pccn space group. K(1) is bonded in a 9-coordinate geometry to one K(1), one C(1), one H(1), one H(2), one O(4), two equivalent O(2), and two equivalent O(3) atoms. The K(1)-K(1) bond length is 2.76 Å. The K(1)-C(1) bond length is 3.20 Å. The K(1)-H(1) bond length is 2.85 Å. The K(1)-H(2) bond length is 2.46 Å. The K(1)-O(4) bond length is 2.97 Å. There is one shorter (2.69 Å) and one longer (3.14 Å) K(1)-O(2) bond length. There is one shorter (3.01 Å) and one longer (3.07 Å) K(1)-O(3) bond length. Ru(1) is bonded in a distorted square pyramidal geometry to one O(1), one O(2), one O(3), one O(4), and one O(6) atom. The Ru(1)-O(1) bond length is 2.03 Å. The Ru(1)-O(2) bond length is 2.02 Å. The Ru(1)-O(3) bond length is 2.27 Å. The Ru(1)-O(4) bond length is 2.04 Å. The Ru(1)-O(6) bond length is 2.02 Å. Co(1) is bonded in a square co-planar geometry to two equivalent O(5) and two equivalent O(7) atoms. Both Co(1)-O(5) bond lengths are 2.09 Å. Both Co(1)-O(7) bond lengths are 2.09 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one K(1), one O(2), one O(3), and one O(4) atom. The C(1)-O(2) bond length is 1.30 Å. The C(1)-O(3) bond length is 1.26 Å. The C(1)-O(4) bond length is 1.29 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(1), one O(5), and one O(6) atom. The C(2)-O(1) bond length is 1.31 Å. The C(2)-O(5) bond length is 1.26 Å. The C(2)-O(6) bond length is 1.29 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one K(1) and one O(7) atom. The H(1)-O(7) bond length is 0.85 Å. In the second H site, H(2) is bonded in a distorted single-bond geometry to one K(1) and one O(7) atom. The H(2)-O(7) bond length is 0.85 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Ru(1) and one C(2) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to two equivalent K(1), one Ru(1), and one C(1) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to two equivalent K(1), one Ru(1), and one C(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one K(1), one Ru(1), and one C(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Co(1) and one C(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Ru(1) and one C(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Co(1), one H(1), and one H(2) atom. Linkers: 16 [O]C([O])=O ,8 O. Metal clusters: 8 [K] ,4 [Co] ,8 [Ru]. The MOF has largest included sphere 4.25 A, density 2.35 g/cm3, surface area 1672.11 m2/g, accessible volume 0.10 cm3/g