Materials Data on SrAl2H6C2O11 by Materials Project
SrAl2H4(CO5)2H2O crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional and consists of four water molecules and one SrAl2H4(CO5)2 framework. In the SrAl2H4(CO5)2 framework, Sr2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sr–O bond distances ranging from 2.51–2.91 Å. Al3+ is bonded to six O2- atoms to form edge-sharing AlO6 octahedra. There are a spread of Al–O bond distances ranging from 1.85–1.96 Å. There are two inequivalent C4+ sites. In the first C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.29 Å) and two longer (1.30 Å) C–O bond length. In the second C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.27 Å) and two longer (1.31 Å) C–O bond length. There are four inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a distorted single-bond geometry to one O2- atom. The H–O bond length is 1.01 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. In the third 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 fourth H1+ site, H1+ is bonded in a distorted linear geometry to two O2- atoms. There is one shorter (1.01 Å) and one longer (1.61 Å) H–O bond length. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to one Sr2+, one Al3+, and one C4+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to one Sr2+, two equivalent Al3+, and one H1+ atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Al3+ and two H1+ atoms. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Al3+ and one H1+ atom. In the fifth O2- site, O2- is bonded in a distorted single-bond geometry to one Sr2+ and one C4+ atom. In the sixth O2- site, O2- is bonded in a distorted single-bond geometry to three equivalent Sr2+ and one C4+ atom. In the seventh O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Al3+ and one H1+ atom. In the eighth O2- site, O2- is bonded in a 3-coordinate geometry to one Sr2+, one Al3+, and one C4+ atom.