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Na2Cl is trigonal omega-like structured and crystallizes in the trigonal R-3m space group. The structure is two-dimensional and consists of three Na2Cl sheets oriented in the (0, 0, 1) direction. Na is bonded in a distorted T-shaped geometry to three equivalent Cl atoms. All Na–Cl bond lengths are 2.84 Å. Cl is bonded to six equivalent Na atoms to form edge-sharing ClNa6 octahedra.
Na2Cl crystallizes in the orthorhombic Cmmm space group. The structure is two-dimensional and consists of two Na2Cl sheets oriented in the (1, 0, 0) direction. there are three inequivalent Na sites. In the first Na site, Na is bonded in a 8-coordinate geometry to four equivalent Na atoms. All Na–Na bond lengths are 3.29 Å. In the second Na site, Na is bonded in a square co-planar geometry to four equivalent Cl atoms. All Na–Cl bond lengths are 2.92 Å. In the third Na site, Na is bonded in an L-shaped geometry to two equivalent Na and two equivalent Cl atoms. Both Na–Cl bond lengths are 2.78 Å. Cl is bonded in a rectangular see-saw-like geometry to four Na atoms.
Na2Cl crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. there are three inequivalent Na sites. In the first Na site, Na is bonded in a 4-coordinate geometry to four equivalent Na and four equivalent Cl atoms. All Na–Na bond lengths are 3.81 Å. All Na–Cl bond lengths are 3.02 Å. In the second Na site, Na is bonded in a body-centered cubic geometry to eight equivalent Cl atoms. All Na–Cl bond lengths are 3.08 Å. In the third Na site, Na is bonded to twelve Na atoms to form a mixture of face and corner-sharing NaNa12 cuboctahedra. All Na–Na bond lengths are 3.56 Å. Cl is bonded in a body-centered cubic geometry to eight Na atoms.