KMgH(CO5)2 crystallizes in the triclinic P-1 space group. K(1) is bonded to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form KO8 hexagonal bipyramids that share edges with two equivalent Mg(1)O6 octahedra. Mg(1) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form MgO6 octahedra that share edges with two equivalent K(1)O8 hexagonal bipyramids. C(1) is bonded in a trigonal planar geometry to one O(1), one O(3), and one O(5) atom. H(1) is bonded in a linear geometry to two equivalent O(1) atoms. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one K(1), one C(1), and one H(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one K(1), one Mg(1), one O(3), and one O(4) atom. In the third O site, O(3) is bonded in a single-bond geometry to one K(1), one C(1), and one O(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one K(1), one Mg(1), and one O(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Mg(1) and one C(1) atom.
KMgH(CO5)2 crystallizes in the triclinic P-1 space group. K(1) is bonded to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form KO8 hexagonal bipyramids that share edges with two equivalent Mg(1)O6 octahedra. Both K(1)-O(1) bond lengths are 2.68 Å. Both K(1)-O(2) bond lengths are 2.63 Å. Both K(1)-O(3) bond lengths are 3.04 Å. Both K(1)-O(4) bond lengths are 2.71 Å. Mg(1) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form MgO6 octahedra that share edges with two equivalent K(1)O8 hexagonal bipyramids. Both Mg(1)-O(2) bond lengths are 2.22 Å. Both Mg(1)-O(4) bond lengths are 2.06 Å. Both Mg(1)-O(5) bond lengths are 2.04 Å. C(1) is bonded in a trigonal planar geometry to one O(1), one O(3), and one O(5) atom. The C(1)-O(1) bond length is 1.29 Å. The C(1)-O(3) bond length is 1.32 Å. The C(1)-O(5) bond length is 1.28 Å. H(1) is bonded in a linear geometry to two equivalent O(1) atoms. Both H(1)-O(1) bond lengths are 1.21 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one K(1), one C(1), and one H(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one K(1), one Mg(1), one O(3), and one O(4) atom. The O(2)-O(3) bond length is 1.83 Å. The O(2)-O(4) bond length is 1.34 Å. In the third O site, O(3) is bonded in a single-bond geometry to one K(1), one C(1), and one O(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one K(1), one Mg(1), and one O(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Mg(1) and one C(1) atom.