KCrH4(C2O5)2 crystallizes in the monoclinic C2/m space group. K(1) is bonded to eight equivalent O(3) atoms to form distorted edge-sharing KO8 hexagonal bipyramids. Cr(1) is bonded in an octahedral geometry to two equivalent O(1) and four equivalent O(2) atoms. C(1) is bonded in a bent 120 degrees geometry to one O(2) and one O(3) atom. H(1) is bonded in a distorted single-bond geometry to one O(1) and one O(2) atom. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Cr(1) and two equivalent H(1) atoms. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Cr(1), one C(1), and one H(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent K(1) and one C(1) atom.
KCrH4(C2O5)2 crystallizes in the monoclinic C2/m space group. K(1) is bonded to eight equivalent O(3) atoms to form distorted edge-sharing KO8 hexagonal bipyramids. There are four shorter (2.95 Å) and four longer (3.00 Å) K(1)-O(3) bond lengths. Cr(1) is bonded in an octahedral geometry to two equivalent O(1) and four equivalent O(2) atoms. Both Cr(1)-O(1) bond lengths are 2.02 Å. All Cr(1)-O(2) bond lengths are 2.01 Å. C(1) is bonded in a bent 120 degrees geometry to one O(2) and one O(3) atom. The C(1)-O(2) bond length is 1.32 Å. The C(1)-O(3) bond length is 1.23 Å. H(1) is bonded in a distorted single-bond geometry to one O(1) and one O(2) atom. The H(1)-O(1) bond length is 1.00 Å. The H(1)-O(2) bond length is 1.65 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Cr(1) and two equivalent H(1) atoms. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Cr(1), one C(1), and one H(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent K(1) and one C(1) atom.