KRu2CdC4H2O13 crystallizes in the triclinic P-1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to two equivalent H(1), two equivalent H(2), two equivalent O(10), and two equivalent O(6) atoms. Both K(1)-H(1) bond lengths are 2.45 Å. Both K(1)-H(2) bond lengths are 2.64 Å. Both K(1)-O(10) bond lengths are 2.71 Å. Both K(1)-O(6) bond lengths are 3.06 Å. In the second K site, K(2) is bonded in a square co-planar geometry to two equivalent O(11) and two equivalent O(5) atoms. Both K(2)-O(11) bond lengths are 2.87 Å. Both K(2)-O(5) bond lengths are 2.85 Å. There are two inequivalent Ru sites. In the first Ru site, Ru(1) is bonded in a distorted square pyramidal geometry to one O(3), one O(4), one O(5), one O(6), and one O(7) atom. The Ru(1)-O(3) bond length is 2.02 Å. The Ru(1)-O(4) bond length is 2.03 Å. The Ru(1)-O(5) bond length is 2.01 Å. The Ru(1)-O(6) bond length is 2.03 Å. The Ru(1)-O(7) bond length is 2.27 Å. In the second Ru site, Ru(2) is bonded in a distorted square pyramidal geometry to one O(1), one O(10), one O(11), one O(8), and one O(9) atom. The Ru(2)-O(1) bond length is 2.26 Å. The Ru(2)-O(10) bond length is 2.01 Å. The Ru(2)-O(11) bond length is 2.04 Å. The Ru(2)-O(8) bond length is 2.02 Å. The Ru(2)-O(9) bond length is 2.03 Å. Cd(1) is bonded in a distorted rectangular see-saw-like geometry to one O(13), one O(2), and two equivalent O(12) atoms. The Cd(1)-O(13) bond length is 2.29 Å. The Cd(1)-O(2) bond length is 2.24 Å. There is one shorter (2.27 Å) and one longer (2.41 Å) Cd(1)-O(12) bond length. There are four inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one O(2), one O(3), and one O(4) atom. The C(1)-O(2) bond length is 1.27 Å. The C(1)-O(3) bond length is 1.28 Å. The C(1)-O(4) bond length is 1.31 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 1.26 Å. The C(2)-O(5) bond length is 1.29 Å. The C(2)-O(6) bond length is 1.30 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one O(12), one O(8), and one O(9) atom. The C(3)-O(12) bond length is 1.27 Å. The C(3)-O(8) bond length is 1.30 Å. The C(3)-O(9) bond length is 1.29 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one O(10), one O(11), and one O(7) atom. The C(4)-O(10) bond length is 1.29 Å. The C(4)-O(11) bond length is 1.30 Å. The C(4)-O(7) bond length is 1.27 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(13) atom. The H(1)-O(13) bond length is 0.85 Å. In the second H site, H(2) is bonded in a single-bond geometry to one K(1) and one O(13) atom. The H(2)-O(13) bond length is 0.85 Å. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Ru(2) and one C(2) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Cd(1) and one C(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Ru(1) and one C(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Ru(1) and one C(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one K(2), one Ru(1), and one C(2) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one K(1), one Ru(1), and one C(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Ru(1) and one C(4) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Ru(2) and one C(3) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Ru(2) and one C(3) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one K(1), one Ru(2), and one C(4) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one K(2), one Ru(2), and one C(4) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to two equivalent Cd(1) and one C(3) atom. In the thirteenth O site, O(13) is bonded in a distorted water-like geometry to one Cd(1), one H(1), and one H(2) atom. Linkers: 8 [O]C([O])=O ,2 O. Metal clusters: 2 [K] ,2 [Cd] ,4 [Ru]. The MOF has largest included sphere 4.19 A, density 2.42 g/cm3, surface area 1820.34 m2/g, accessible volume 0.14 cm3/g