Materials Data on Fe3P2(HO)8 by Materials Project
Fe3P2(HO2)4(H2)2 crystallizes in the monoclinic C2/m space group. The structure is two-dimensional and consists of four hydrogen molecules and two Fe3P2(HO2)4 sheets oriented in the (0, 1, 0) direction. In each Fe3P2(HO2)4 sheet, there are two inequivalent Fe2+ sites. In the first Fe2+ site, Fe2+ is bonded in a 4-coordinate geometry to two equivalent H1+ and four O2- atoms. Both Fe–H bond lengths are 2.09 Å. There are two shorter (1.99 Å) and two longer (2.22 Å) Fe–O bond lengths. In the second Fe2+ site, Fe2+ is bonded in a distorted linear geometry to two equivalent O2- atoms. Both Fe–O bond lengths are 1.87 Å. P1+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of P–O bond distances ranging from 1.55–1.57 Å. H1+ is bonded in a distorted single-bond geometry to one Fe2+ and one H1+ atom. The H–H bond length is 0.77 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Fe2+ and one P1+ atom. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Fe2+ and one P1+ atom. In the third O2- site, O2- is bonded in a bent 120 degrees geometry to one Fe2+ and one P1+ atom.