Materials Data on YH2C4O9 by Materials Project
YC4H2O9 crystallizes in the tetragonal P4_2/n space group. The structure is two-dimensional and consists of two YC4H2O9 sheets oriented in the (0, 0, 1) direction. Y3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Y–O bond distances ranging from 2.36–2.45 Å. There are two inequivalent C+3.25+ sites. In the first C+3.25+ site, C+3.25+ is bonded in a bent 120 degrees geometry to two O2- atoms. Both C–O bond lengths are 1.25 Å. In the second C+3.25+ site, C+3.25+ is bonded in a bent 120 degrees geometry to two O2- atoms. Both C–O bond lengths are 1.25 Å. H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Y3+ and one C+3.25+ atom. In the second O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Y3+ and one C+3.25+ atom. In the third O2- site, O2- is bonded in a distorted water-like geometry to one Y3+ and two equivalent H1+ atoms. In the fourth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Y3+ and one C+3.25+ atom. In the fifth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Y3+ and one C+3.25+ atom.