Materials Data on KB5(H2O5)2 by Materials Project
KB5O6(OH)4 crystallizes in the monoclinic P2_1/c space group. The structure is two-dimensional and consists of one KB5O6(OH)4 sheet oriented in the (1, 0, 0) direction. K1+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of K–O bond distances ranging from 2.80–3.28 Å. There are five inequivalent B3+ sites. In the first B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. There is two shorter (1.37 Å) and one longer (1.41 Å) B–O bond length. In the second B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.36 Å) and two longer (1.39 Å) B–O bond length. In the third B3+ site, B3+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of B–O bond distances ranging from 1.47–1.49 Å. In the fourth B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.36 Å) and two longer (1.39 Å) B–O bond length. In the fifth B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. There is two shorter (1.37 Å) and one longer (1.40 Å) B–O bond length. There are four inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a distorted single-bond geometry to two O2- atoms. There is one shorter (1.00 Å) and one longer (1.67 Å) H–O bond length. 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. In the third H1+ site, H1+ is bonded in a linear geometry to two O2- atoms. There is one shorter (1.02 Å) and one longer (1.57 Å) H–O bond length. In the fourth 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 ten inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 120 degrees geometry to two B3+ atoms. In the second O2- site, O2- is bonded in a bent 120 degrees geometry to one K1+, one B3+, and one H1+ atom. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to two B3+ and one H1+ atom. In the fourth O2- site, O2- is bonded in a bent 120 degrees geometry to one K1+ and two B3+ atoms. In the fifth O2- site, O2- is bonded in a water-like geometry to one B3+ and one H1+ atom. In the sixth O2- site, O2- is bonded in a bent 120 degrees geometry to one K1+ and two B3+ atoms. In the seventh O2- site, O2- is bonded in a 2-coordinate geometry to one K1+ and three H1+ atoms. In the eighth O2- site, O2- is bonded in a bent 120 degrees geometry to one K1+ and two B3+ atoms. In the ninth O2- site, O2- is bonded in a bent 120 degrees geometry to two equivalent K1+ and two B3+ atoms. In the tenth O2- site, O2- is bonded in a bent 120 degrees geometry to two equivalent K1+ and two B3+ atoms.