Materials Data on KC4(OF)2 by Materials Project
KC2O2FCCF crystallizes in the monoclinic P2/c space group. The structure is two-dimensional and consists of four fluoromethane molecules; four methane molecules; and one KC2O2F sheet oriented in the (0, 1, 0) direction. In the KC2O2F sheet, K1+ is bonded in a 7-coordinate geometry to six O2- and one F1- atom. There are a spread of K–O bond distances ranging from 2.69–2.94 Å. The K–F bond length is 2.86 Å. There are two inequivalent C+1.25+ sites. In the first C+1.25+ site, C+1.25+ is bonded in a single-bond geometry to one F1- atom. The C–F bond length is 1.35 Å. In the second C+1.25+ site, C+1.25+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.26 Å) and one longer (1.27 Å) C–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to three equivalent K1+ and one C+1.25+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to three equivalent K1+ and one C+1.25+ atom. F1- is bonded in a distorted single-bond geometry to one K1+ and one C+1.25+ atom.