Materials Data on H4OF2 by Materials Project
(HF)2H2O crystallizes in the monoclinic P2_1/c space group. The structure is two-dimensional and consists of one (HF)2H2O sheet oriented in the (1, 0, 0) direction. there are four inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a linear geometry to one O2- and one F1- atom. The H–O bond length is 1.03 Å. The H–F bond length is 1.46 Å. In the second H1+ site, H1+ is bonded in a linear geometry to one O2- and one F1- atom. The H–O bond length is 1.03 Å. The H–F bond length is 1.46 Å. In the third H1+ site, H1+ is bonded in a linear geometry to one O2- and one F1- atom. The H–O bond length is 1.02 Å. The H–F bond length is 1.52 Å. In the fourth H1+ site, H1+ is bonded in a linear geometry to two F1- atoms. There is one shorter (1.04 Å) and one longer (1.32 Å) H–F bond length. O2- is bonded in a trigonal non-coplanar geometry to three H1+ atoms. There are two inequivalent F1- sites. In the first F1- site, F1- is bonded in a trigonal planar geometry to three H1+ atoms. In the second F1- site, F1- is bonded in a bent 120 degrees geometry to two H1+ atoms.