Materials Data on NaCu3F7 by Materials Project
NaCu3F7 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Na1+ is bonded in a 8-coordinate geometry to eight F1- atoms. There are a spread of Na–F bond distances ranging from 2.36–2.88 Å. There are three inequivalent Cu2+ sites. In the first Cu2+ site, Cu2+ is bonded to six F1- atoms to form corner-sharing CuF6 octahedra. The corner-sharing octahedra tilt angles range from 41–59°. There are a spread of Cu–F bond distances ranging from 1.92–2.38 Å. In the second Cu2+ site, Cu2+ is bonded to six F1- atoms to form distorted corner-sharing CuF6 octahedra. The corner-sharing octahedra tilt angles range from 41–59°. There are a spread of Cu–F bond distances ranging from 1.91–2.39 Å. In the third Cu2+ site, Cu2+ is bonded in a square co-planar geometry to four F1- atoms. There is two shorter (1.88 Å) and two longer (1.97 Å) Cu–F bond length. There are four inequivalent F1- sites. In the first F1- site, F1- is bonded in a bent 120 degrees geometry to two equivalent Cu2+ atoms. In the second F1- site, F1- is bonded in a 4-coordinate geometry to two equivalent Na1+ and two Cu2+ atoms. In the third F1- site, F1- is bonded in a 3-coordinate geometry to one Na1+ and three Cu2+ atoms. In the fourth F1- site, F1- is bonded in a distorted trigonal planar geometry to one Na1+ and two Cu2+ atoms.