Materials Data on TaHg2F6 by Materials Project
TaHg2F6 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Ta3+ is bonded in an octahedral geometry to six F1- atoms. There are a spread of Ta–F bond distances ranging from 1.92–1.94 Å. There are two inequivalent Hg+1.50+ sites. In the first Hg+1.50+ site, Hg+1.50+ is bonded in a distorted rectangular see-saw-like geometry to four F1- atoms. There are two shorter (2.92 Å) and two longer (2.99 Å) Hg–F bond lengths. In the second Hg+1.50+ site, Hg+1.50+ is bonded in a 6-coordinate geometry to four F1- atoms. There are two shorter (2.88 Å) and two longer (2.97 Å) Hg–F bond lengths. There are five inequivalent F1- sites. In the first F1- site, F1- is bonded in a distorted single-bond geometry to one Ta3+ and two Hg+1.50+ atoms. In the second F1- site, F1- is bonded in a distorted single-bond geometry to one Ta3+ and two equivalent Hg+1.50+ atoms. In the third F1- site, F1- is bonded in a single-bond geometry to one Ta3+ atom. In the fourth F1- site, F1- is bonded in a distorted single-bond geometry to one Ta3+ and two equivalent Hg+1.50+ atoms. In the fifth F1- site, F1- is bonded in a distorted single-bond geometry to one Ta3+ and two equivalent Hg+1.50+ atoms. The F–Ta bond length is 1.92 Å.