Na2CuC3 crystallizes in the tetragonal P4/mbm space group. Na(1) is bonded in a 4-coordinate geometry to two equivalent C(1) and two equivalent C(2) atoms. Cu(1) is bonded in a square co-planar geometry to four equivalent C(1) atoms. There are two inequivalent C sites. In the first C site, C(2) is bonded to four equivalent Na(1) and two equivalent C(1) atoms to form edge-sharing CNa4C2 octahedra. In the second C site, C(1) is bonded in a 5-coordinate geometry to two equivalent Na(1), two equivalent Cu(1), and one C(2) atom.
Na2CuC3 crystallizes in the tetragonal P4/mbm space group. Na(1) is bonded in a 4-coordinate geometry to two equivalent C(1) and two equivalent C(2) atoms. Both Na(1)-C(1) bond lengths are 2.52 Å. Both Na(1)-C(2) bond lengths are 2.58 Å. Cu(1) is bonded in a square co-planar geometry to four equivalent C(1) atoms. All Cu(1)-C(1) bond lengths are 2.24 Å. There are two inequivalent C sites. In the first C site, C(2) is bonded to four equivalent Na(1) and two equivalent C(1) atoms to form edge-sharing CNa4C2 octahedra. Both C(2)-C(1) bond lengths are 1.32 Å. In the second C site, C(1) is bonded in a 5-coordinate geometry to two equivalent Na(1), two equivalent Cu(1), and one C(2) atom.