Figure 1.

Amphiphilic α-hydrazido acid derivatives used in this work and tridimensional structures of their ammonium cations, for which the electrostatic potential surfaces are also reported. The α-hydrazido acid unit is in bold, while the N-terminal acyl, C-terminal amino and ammonium unit of glycine side chain are in red, blue, and green, respectively. Covalent + electrostatic hydrogen bonds (black dotted lines) and purely electrostatic hydrogen bonds (red dotted lines) are reported. The negatively charged chloride anions are on the rear side and their surfaces are only partly visible.