Crystal Packing Diversity in Azo-Labeled Amino Acid Esters: Structural Origins of Z ′ Variability
Nine mechanochemically prepared 4′-(N,N-dimethylamino)azobenzene-n-carboxamides (n = 2–4) derived from α-amino acid esters were structurally characterized. X-ray diffraction on single crystals of chiral amides reveals a notably high incidence of structures with Z′ > 1 (five out of eight). Structural analysis indicate...