Materials Data on SnAsF7 by Materials Project

Abstract

Sn3As2F15AsF6 is Molybdenum Carbide MAX Phase-like structured and crystallizes in the trigonal R32 space group. The structure is zero-dimensional and consists of three AsF6 clusters and three Sn3As2F15 clusters. In each AsF6 cluster, As5+ is bonded in an octahedral geometry to six equivalent F1- atoms. All As–F bond lengths are 1.78 Å. F1- is bonded in a single-bond geometry to one As5+ atom. In each Sn3As2F15 cluster, Sn2+ is bonded in a 2-coordinate geometry to four F1- atoms. There are two shorter (2.14 Å) and two longer (2.59 Å) Sn–F bond lengths. As5+ is bonded in an octahedral geometry to six F1- atoms. There is three shorter (1.76 Å) and three longer (1.79 Å) As–F bond length. There are three inequivalent F1- sites. In the first F1- site, F1- is bonded in a bent 150 degrees geometry to two equivalent Sn2+ atoms. In the second F1- site, F1- is bonded in a distorted single-bond geometry to one Sn2+ and one As5+ atom. In the third F1- site, F1- is bonded in a single-bond geometry to one As5+ atom.