Fig. 2: Solid-state superstructure of CNC-T.
From: Two-photon excited deep-red and near-infrared emissive organic co-crystals

a Plan view of a capped-sticks representation demonstrating the face-to-face packing between COR and NDI-Δ. b Side-on view of a capped-sticks representation indicating that two adjacent NDI-Δ molecules are linked by [C–H···O] hydrogen bonding. c 1D Columnar superstructure composed of inner NDI-Δ nanotube and outer COR molecules. d Solid-state superstructure of CNC-T illustrating the layer-by-layer stacking along the c axis.