K2MgH8(CO5)2 crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 5-coordinate geometry to one O(2), one O(3), one O(5), and two equivalent O(4) atoms. Mg(1) is bonded in an octahedral geometry to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms. C(1) is bonded in a trigonal planar geometry to one O(2), one O(4), and one O(5) atom. There are four inequivalent H sites. In the first H site, H(1) is bonded in a distorted single-bond geometry to one O(1) and one O(2) atom. In the second H site, H(2) is bonded in a distorted linear geometry to one O(2) and one O(3) atom. In the third H site, H(3) is bonded in a single-bond geometry to one O(1) atom. In the fourth H site, H(4) is bonded in a distorted single-bond geometry to one O(3) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted water-like geometry to one Mg(1), one H(1), and one H(3) atom. In the second O site, O(2) is bonded in a distorted tetrahedral geometry to one K(1), one C(1), one H(1), and one H(2) atom. In the third O site, O(3) is bonded in a distorted water-like geometry to one K(1), one Mg(1), one H(2), and one H(4) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to two equivalent K(1), one Mg(1), and one C(1) atom. In the fifth O site, O(5) is bonded in a 1-coordinate geometry to one K(1) and one C(1) atom.
K2MgH8(CO5)2 crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 5-coordinate geometry to one O(2), one O(3), one O(5), and two equivalent O(4) atoms. The K(1)-O(2) bond length is 2.81 Å. The K(1)-O(3) bond length is 2.86 Å. The K(1)-O(5) bond length is 2.74 Å. There is one shorter (2.84 Å) and one longer (2.88 Å) K(1)-O(4) bond length. Mg(1) is bonded in an octahedral geometry to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms. Both Mg(1)-O(1) bond lengths are 2.13 Å. Both Mg(1)-O(3) bond lengths are 2.12 Å. Both Mg(1)-O(4) bond lengths are 2.06 Å. C(1) is bonded in a trigonal planar geometry to one O(2), one O(4), and one O(5) atom. The C(1)-O(2) bond length is 1.31 Å. The C(1)-O(4) bond length is 1.30 Å. The C(1)-O(5) bond length is 1.30 Å. There are four inequivalent H sites. In the first H site, 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 1.01 Å. The H(1)-O(2) bond length is 1.63 Å. In the second H site, H(2) is bonded in a distorted linear geometry to one O(2) and one O(3) atom. The H(2)-O(2) bond length is 1.58 Å. The H(2)-O(3) bond length is 1.02 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(1) atom. The H(3)-O(1) bond length is 0.99 Å. In the fourth H site, H(4) is bonded in a distorted single-bond geometry to one O(3) atom. The H(4)-O(3) bond length is 1.01 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted water-like geometry to one Mg(1), one H(1), and one H(3) atom. In the second O site, O(2) is bonded in a distorted tetrahedral geometry to one K(1), one C(1), one H(1), and one H(2) atom. In the third O site, O(3) is bonded in a distorted water-like geometry to one K(1), one Mg(1), one H(2), and one H(4) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to two equivalent K(1), one Mg(1), and one C(1) atom. In the fifth O site, O(5) is bonded in a 1-coordinate geometry to one K(1) and one C(1) atom.