Materials Data on RbBe2F5 by Materials Project
RbBe2F5 crystallizes in the triclinic P1 space group. The structure is three-dimensional. Rb1+ is bonded in a 8-coordinate geometry to eight F1- atoms. There are a spread of Rb–F bond distances ranging from 2.84–3.32 Å. There are two inequivalent Be2+ sites. In the first Be2+ site, Be2+ is bonded to four F1- atoms to form corner-sharing BeF4 tetrahedra. There are a spread of Be–F bond distances ranging from 1.51–1.59 Å. In the second Be2+ site, Be2+ is bonded to four F1- atoms to form corner-sharing BeF4 tetrahedra. There are a spread of Be–F bond distances ranging from 1.51–1.59 Å. There are five inequivalent F1- sites. In the first F1- site, F1- is bonded in a distorted single-bond geometry to three equivalent Rb1+ and one Be2+ atom. In the second F1- site, F1- is bonded in a bent 150 degrees geometry to two Be2+ atoms. In the third F1- site, F1- is bonded in a distorted bent 120 degrees geometry to one Rb1+ and two Be2+ atoms. In the fourth F1- site, F1- is bonded in a distorted bent 150 degrees geometry to one Rb1+ and two Be2+ atoms. In the fifth F1- site, F1- is bonded in a distorted single-bond geometry to three equivalent Rb1+ and one Be2+ atom.