Materials Data on NaTh2F9 by Materials Project
NaTh2F9 crystallizes in the tetragonal I-42m space group. The structure is three-dimensional. Na1+ is bonded in a distorted octahedral geometry to six F1- atoms. There are two shorter (2.31 Å) and four longer (2.50 Å) Na–F bond lengths. Th4+ is bonded in a 9-coordinate geometry to nine F1- atoms. There are a spread of Th–F bond distances ranging from 2.26–2.52 Å. There are four inequivalent F1- sites. In the first F1- site, F1- is bonded in a distorted bent 150 degrees geometry to two equivalent Th4+ atoms. In the second F1- site, F1- is bonded in a 3-coordinate geometry to one Na1+ and two equivalent Th4+ atoms. In the third F1- site, F1- is bonded in a distorted T-shaped geometry to one Na1+ and two equivalent Th4+ atoms. In the fourth F1- site, F1- is bonded in a linear geometry to two equivalent Th4+ atoms.