DOE OSTI2020
Sb2F7 crystallizes in the monoclinic P2_1/m space group. The structure is one-dimensional and consists of two SbF6 clusters and one Sb3F8 ribbon oriented in the (0, 1, 0) direction. In each SbF6 cluster, Sb is bonded in an octahedral geometry to six F atoms. There is four shorter (1.92 Å) and two longer (1.93 Å) Sb–F bond length. There are four inequivalent F sites. In the first F site, F is bonded in a single-bond geometry to one Sb atom. In the second F site, F is bonded in a single-bond geometry to one Sb atom. In the third F site, F is bonded in a single-bond geometry to one Sb atom. In the fourth F site, F is bonded in a single-bond geometry to one Sb atom. In the Sb3F8 ribbon, there are two inequivalent Sb sites. In the first Sb site, Sb is bonded in a distorted square pyramidal geometry to five F atoms. There are a spread of Sb–F bond distances ranging from 1.93–2.38 Å. In the second Sb site, Sb is bonded in a distorted rectangular see-saw-like geometry to four F atoms. There are a spread of Sb–F bond distances ranging from 1.94–2.26 Å. There are five inequivalent F sites. In the first F site, F is bonded in a single-bond geometry to one Sb atom. In the second F site, F is bonded in a distorted bent 150 degrees geometry to two Sb atoms. In the third F site, F is bonded in a bent 150 degrees geometry to two equivalent Sb atoms. In the fourth F site, F is bonded in a single-bond geometry to one Sb atom. In the fifth F site, F is bonded in a bent 150 degrees geometry to two Sb atoms.