Fig. 2: Single-crystal structures and intermolecular packing modes of NaO1, NaO2, and NaO3.

a The single-molecule crystallographic structures of NaO1, NaO2, NaO3, and Y6; Intermolecular packing modes, intermolecular dimeric stacking, and calculated electronic coupling of b NaO1, c NaO2, d NaO3.