Fig. 4. (a) Development of the 1H NMR resonances of (R)-1 upon self-assembly into Agg I, induced by decreasing solvent polarity from 100% CDCl3 (monomer) to 20% CDCl3/80% MCH-d14 (c = 2 × 10–3 M). (b) Parallel molecular packing governed by amide-to-amide hydrogen bonding and unconventional C–H···Oalkoxy interactions, which are illustrated in the zoom. Right panel: partial FT-IR spectra of monomer (CHCl3, c = 0.5 mM), Agg I and Agg II (both thin films), showing regions of N–H (c) and carbonyl C O (d) stretching frequencies. (e) Excerpt of the molecular packing in Agg II illustrating the N–H···Cl interactions leading to a slipped molecular arrangement.
