Na3CuO2 crystallizes in the trigonal R-3c space group. Na(1) is bonded in a 6-coordinate geometry to two equivalent Cu(1) and four equivalent O(1) atoms. Cu(1) is bonded in a linear geometry to six equivalent Na(1) and two equivalent O(1) atoms. O(1) is bonded in a 7-coordinate geometry to six equivalent Na(1) and one Cu(1) atom.
Na3CuO2 crystallizes in the trigonal R-3c space group. Na(1) is bonded in a 6-coordinate geometry to two equivalent Cu(1) and four equivalent O(1) atoms. Both Na(1)-Cu(1) bond lengths are 2.78 Å. There are two shorter (2.39 Å) and two longer (2.61 Å) Na(1)-O(1) bond lengths. Cu(1) is bonded in a linear geometry to six equivalent Na(1) and two equivalent O(1) atoms. Both Cu(1)-O(1) bond lengths are 1.81 Å. O(1) is bonded in a 7-coordinate geometry to six equivalent Na(1) and one Cu(1) atom.