Materials Data on KYP2H4O9 by Materials Project
KYP2(HO4)2H2O crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional and consists of four water molecules and one KYP2(HO4)2 framework. In the KYP2(HO4)2 framework, K1+ is bonded in a 4-coordinate geometry to four O2- atoms. There are a spread of K–O bond distances ranging from 2.69–2.88 Å. Y3+ is bonded to seven O2- atoms to form distorted YO7 pentagonal bipyramids that share corners with six PO4 tetrahedra. There are a spread of Y–O bond distances ranging from 2.26–2.43 Å. There are two inequivalent P5+ sites. In the first P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with three equivalent YO7 pentagonal bipyramids and a cornercorner with one PO4 tetrahedra. There is three shorter (1.53 Å) and one longer (1.65 Å) P–O bond length. In the second P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with three equivalent YO7 pentagonal bipyramids and a cornercorner with one PO4 tetrahedra. There is three shorter (1.53 Å) and one longer (1.65 Å) P–O bond length. There are two inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to one Y3+ and one P5+ atom. In the second O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one K1+ and two P5+ atoms. In the third O2- site, O2- is bonded in a 1-coordinate geometry to one K1+, one Y3+, and one P5+ atom. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to one K1+, one Y3+, and one P5+ atom. In the fifth O2- site, O2- is bonded in a 1-coordinate geometry to one K1+, one Y3+, and one P5+ atom. In the sixth O2- site, O2- is bonded in a 2-coordinate geometry to one Y3+ and one P5+ atom. In the seventh O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Y3+ and one P5+ atom. In the eighth O2- site, O2- is bonded in a distorted water-like geometry to one Y3+ and two H1+ atoms.