Figure 4

(a) Molecular crystal packing showing the head-to-tail dimers of compound 4 within the unit cell. (b) Illustration showing the complex series of short-range intermolecular interactions (cyan) within the crystal field. The molecule shown in magenta was used as the central point to illustrate all interactions present. (c) Schematic of the prominent non-classical C-H…N hydrogen-bonds (red) observed, as described in Table 2.