Materials Data on Sn2BF7 by Materials Project
BF4Sn2F3 crystallizes in the monoclinic P2_1/c space group. The structure is one-dimensional and consists of four BF4 clusters and two Sn2F3 ribbons oriented in the (1, 0, 0) direction. In each BF4 cluster, B3+ is bonded in a tetrahedral geometry to four F1- atoms. There is three shorter (1.42 Å) and one longer (1.43 Å) B–F bond length. There are four inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one B3+ atom. In the second F1- site, F1- is bonded in a single-bond geometry to one B3+ atom. In the third F1- site, F1- is bonded in a single-bond geometry to one B3+ atom. In the fourth F1- site, F1- is bonded in a single-bond geometry to one B3+ atom. In each Sn2F3 ribbon, there are two inequivalent Sn2+ sites. In the first Sn2+ site, Sn2+ is bonded in a distorted T-shaped geometry to three F1- atoms. There are one shorter (2.13 Å) and two longer (2.15 Å) Sn–F bond lengths. In the second Sn2+ site, Sn2+ is bonded in a distorted T-shaped geometry to three F1- atoms. There are a spread of Sn–F bond distances ranging from 2.14–2.18 Å. There are three inequivalent F1- sites. In the first F1- site, F1- is bonded in a linear geometry to two Sn2+ atoms. In the second F1- site, F1- is bonded in a bent 150 degrees geometry to two Sn2+ atoms. In the third F1- site, F1- is bonded in a linear geometry to two Sn2+ atoms.