Materials Data on UC2O9 by Materials Project
UCO7CO2 crystallizes in the monoclinic P2_1/c space group. The structure is zero-dimensional and consists of four carbon dioxide molecules and two UCO7 clusters. In each UCO7 cluster, U is bonded in a 4-coordinate geometry to five O atoms. There are a spread of U–O bond distances ranging from 1.80–2.88 Å. C is bonded in a trigonal planar geometry to three O atoms. There is one shorter (1.23 Å) and two longer (1.33 Å) C–O bond length. There are seven inequivalent O sites. In the first O site, O is bonded in a water-like geometry to one U and one O atom. The O–O bond length is 1.24 Å. In the second O site, O is bonded in a single-bond geometry to one C atom. In the third O site, O is bonded in a single-bond geometry to one U atom. In the fourth O site, O is bonded in a single-bond geometry to one O atom. In the fifth O site, O is bonded in a single-bond geometry to one U atom. In the sixth O site, O is bonded in a distorted linear geometry to one U and one C atom. In the seventh O site, O is bonded in a distorted linear geometry to one U and one C atom.