Materials Data on Na2CuH6C2O9 by Materials Project
Na2CuC2H6O9 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded to six O2- atoms to form a mixture of distorted edge, face, and corner-sharing NaO6 octahedra. The corner-sharing octahedral tilt angles are 77°. There are a spread of Na–O bond distances ranging from 2.37–2.48 Å. In the second Na1+ site, Na1+ is bonded to six O2- atoms to form a mixture of edge and face-sharing NaO6 octahedra. There are a spread of Na–O bond distances ranging from 2.36–2.48 Å. Cu2+ is bonded in a 5-coordinate geometry to six O2- atoms. There are a spread of Cu–O bond distances ranging from 1.99–2.66 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 (1.26 Å) and two longer (1.32 Å) C–O bond length. In the second C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of C–O bond distances ranging from 1.27–1.32 Å. There are six inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to two O2- atoms. There is one shorter (0.99 Å) and one longer (1.76 Å) H–O bond length. In the second H1+ site, H1+ is bonded in a single-bond geometry to two O2- atoms. There is one shorter (1.00 Å) and one longer (1.74 Å) H–O bond length. 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 single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. In the fifth H1+ site, H1+ is bonded in a single-bond geometry to two O2- atoms. There is one shorter (1.00 Å) and one longer (1.74 Å) H–O bond length. In the sixth 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 nine inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to one Cu2+, one C4+, and one H1+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to two Na1+, one C4+, and one H1+ atom. In the third O2- site, O2- is bonded in a 3-coordinate geometry to one Cu2+, one C4+, and one H1+ atom. In the fourth O2- site, O2- is bonded in a distorted water-like geometry to two Na1+ and two H1+ atoms. In the fifth O2- site, O2- is bonded in a 4-coordinate geometry to two Na1+, one Cu2+, and one C4+ atom. In the sixth O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Cu2+ and one C4+ atom. In the seventh O2- site, O2- is bonded in a distorted water-like geometry to two equivalent Na1+ and two H1+ atoms. In the eighth O2- site, O2- is bonded in a distorted water-like geometry to one Na1+, one Cu2+, and two H1+ atoms. In the ninth O2- site, O2- is bonded in a 1-coordinate geometry to three Na1+ and one C4+ atom.