KScH4(C2O5)2 crystallizes in the hexagonal P6_222 space group. K(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(3) atoms. All K(1)-O(1) bond lengths are 3.02 Å. All K(1)-O(3) bond lengths are 2.83 Å. Sc(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. All Sc(1)-O(1) bond lengths are 2.17 Å. All Sc(1)-O(2) bond lengths are 2.33 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to two equivalent O(1) atoms. Both C(1)-O(1) bond lengths are 1.26 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to two equivalent O(2) atoms. Both C(2)-O(2) bond lengths are 1.27 Å. H(1) is bonded in a single-bond geometry to one O(3) atom. The H(1)-O(3) bond length is 0.98 Å. There are three inequivalent O sites. In the first O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Sc(1) and one C(2) atom. In the second O site, O(3) is bonded in a distorted water-like geometry to two equivalent K(1) and two equivalent H(1) atoms. In the third O site, O(1) is bonded in a distorted bent 120 degrees geometry to one K(1), one Sc(1), and one C(1) atom. Linkers: 6 [O]C(=O)C([O])=O. Metal clusters: 3 [K] ,3 [Sc]. The MOF has largest included sphere 2.67 A, density 1.86 g/cm3, surface area 2182.73 m2/g, accessible volume 0.09 cm3/g