DOE OSTI2020
ZrF4(NF)2 crystallizes in the orthorhombic Pca2_1 space group. The structure is one-dimensional and consists of sixteen monofluoroamine molecules and four ZrF4 ribbons oriented in the (1, 0, 0) direction. In each ZrF4 ribbon, there are two inequivalent Zr4+ sites. In the first Zr4+ site, Zr4+ is bonded to six F1- atoms to form a mixture of distorted corner and face-sharing ZrF6 octahedra. The corner-sharing octahedral tilt angles are 34°. There are a spread of Zr–F bond distances ranging from 1.92–2.20 Å. In the second Zr4+ site, Zr4+ is bonded to six F1- atoms to form a mixture of distorted corner and face-sharing ZrF6 octahedra. The corner-sharing octahedral tilt angles are 34°. There are a spread of Zr–F bond distances ranging from 1.92–2.24 Å. There are eight inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one Zr4+ atom. In the second F1- site, F1- is bonded in a single-bond geometry to one Zr4+ atom. In the third F1- site, F1- is bonded in a single-bond geometry to one Zr4+ atom. In the fourth F1- site, F1- is bonded in an L-shaped geometry to two Zr4+ atoms. In the fifth F1- site, F1- is bonded in an L-shaped geometry to two Zr4+ atoms. In the sixth F1- site, F1- is bonded in an L-shaped geometry to two Zr4+ atoms. In the seventh F1- site, F1- is bonded in a bent 150 degrees geometry to two Zr4+ atoms. In the eighth F1- site, F1- is bonded in a single-bond geometry to one Zr4+ atom.