Materials Data on KMg(CO5)2 by Materials Project
KMg(CO5)2 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. K is bonded to eight O atoms to form distorted KO8 hexagonal bipyramids that share edges with two equivalent MgO6 octahedra. There are a spread of K–O bond distances ranging from 2.66–3.19 Å. Mg is bonded to six O atoms to form distorted MgO6 octahedra that share edges with two equivalent KO8 hexagonal bipyramids. There are a spread of Mg–O bond distances ranging from 1.95–2.39 Å. C is bonded in a trigonal planar geometry to three O atoms. There are a spread of C–O bond distances ranging from 1.27–1.29 Å. There are five inequivalent O sites. In the first O site, O is bonded in a 3-coordinate geometry to one K, one Mg, and one O atom. The O–O bond length is 1.28 Å. In the second O site, O is bonded in a bent 120 degrees geometry to one Mg and one C atom. In the third O site, O is bonded in a 3-coordinate geometry to one K, one Mg, and one O atom. In the fourth O site, O is bonded in a distorted single-bond geometry to one K and one C atom. In the fifth O site, O is bonded in a distorted bent 150 degrees geometry to one K and one C atom.