Materials Data on Na5Cu(HO2)2 by Materials Project
Na5Cu(HO2)2 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are four inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a distorted rectangular see-saw-like geometry to four O2- atoms. There are a spread of Na–O bond distances ranging from 2.26–2.45 Å. In the second Na1+ site, Na1+ is bonded in a distorted bent 150 degrees geometry to two equivalent O2- atoms. There are one shorter (2.29 Å) and one longer (2.30 Å) Na–O bond lengths. In the third Na1+ site, Na1+ is bonded to six O2- atoms to form distorted face-sharing NaO6 octahedra. There are a spread of Na–O bond distances ranging from 2.41–2.61 Å. In the fourth Na1+ site, Na1+ is bonded in a rectangular see-saw-like geometry to four O2- atoms. There are a spread of Na–O bond distances ranging from 2.27–2.40 Å. Cu1+ is bonded in a linear geometry to two O2- atoms. There is one shorter (1.80 Å) and one longer (1.83 Å) Cu–O bond length. H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to five Na1+ and one H1+ atom. In the second O2- site, O2- is bonded in a 6-coordinate geometry to five Na1+ and one Cu1+ atom. In the third O2- site, O2- is bonded to five Na1+ and one Cu1+ atom to form corner-sharing ONa5Cu octahedra. The corner-sharing octahedral tilt angles are 37°.