Helical Inversion of Peptide‐based Supramolecular Co2+ Complexes
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Abstract
Herein, we report the helical inversion of supramolecular polymeric complexes of Co2+ containing a peptide‐based ligand comprising one alanine and three glycine moieties and an achiral terpyridine group. The helicity of the peptide‐based supramolecular polymer is controlled via strain‐induced chirality at different stoichiometric ligand/Co2+ ratios. The supramolecular polymer S‐1 adopts octahedral geometry with right‐handed helicity (P‐type) in the presence of <0.7 equiv of Co2+. In contrast, it adopts coexisting octahedral and square‐pyramidal geometries in the presence of 1.0 equiv of Co2+ and presents left‐handed helicity (M‐type). The helicities of the supramolecular polymer R‐1 with Co2+, prepared using the chirally opposite ligand, were completely opposite to those of S‐1. Furthermore, the circular dichroism intensities of supramolecular polymers S‐1 and R‐1 in the presence of Co2+ were 900–1500 times higher than those of free S‐1 and R‐1. In addition, the helical inversion was completely reversible and controllable by the addition of more Co2+ or ligand.
