Materials Data on Na2SnGe2(HO4)2 by Materials Project
Na2SnGe2(HO4)2 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Na–O bond distances ranging from 2.29–2.50 Å. In the second Na1+ site, Na1+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Na–O bond distances ranging from 2.33–2.75 Å. There are two inequivalent Sn4+ sites. In the first Sn4+ site, Sn4+ is bonded to six O2- atoms to form SnO6 octahedra that share corners with six GeO4 tetrahedra. There are a spread of Sn–O bond distances ranging from 2.05–2.12 Å. In the second Sn4+ site, Sn4+ is bonded to six O2- atoms to form SnO6 octahedra that share corners with two equivalent GeO4 tetrahedra. There are a spread of Sn–O bond distances ranging from 2.07–2.11 Å. There are two inequivalent Ge4+ sites. In the first Ge4+ site, Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share corners with two SnO6 octahedra and corners with two equivalent GeO4 tetrahedra. The corner-sharing octahedra tilt angles range from 54–58°. There are a spread of Ge–O bond distances ranging from 1.74–1.82 Å. In the second Ge4+ site, Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share corners with two equivalent SnO6 octahedra and corners with two equivalent GeO4 tetrahedra. The corner-sharing octahedra tilt angles range from 44–54°. There are a spread of Ge–O bond distances ranging from 1.75–1.81 Å. 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 0.97 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded to two equivalent Na1+, one Sn4+, and one Ge4+ atom to form distorted ONa2SnGe tetrahedra that share a cornercorner with one ONa2SnGe tetrahedra, corners with three equivalent ONa2Ge2 trigonal pyramids, and an edgeedge with one ONa2SnGe tetrahedra. In the second O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to one Na1+, one Sn4+, and one Ge4+ atom. In the third O2- site, O2- is bonded in a 3-coordinate geometry to one Na1+ and two Ge4+ atoms. In the fourth O2- site, O2- is bonded to two Na1+ and two Ge4+ atoms to form distorted corner-sharing ONa2Ge2 trigonal pyramids. In the fifth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to one Na1+, one Sn4+, and one Ge4+ atom. In the sixth O2- site, O2- is bonded in a 3-coordinate geometry to one Na1+, one Sn4+, and one Ge4+ atom. In the seventh O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Na1+, one Sn4+, and one H1+ atom. In the eighth O2- site, O2- is bonded in a distorted single-bond geometry to two Na1+, one Sn4+, and one H1+ atom.