Helical Inversion of Peptide‐based Supramolecular Co2+ Complexes

Bulletin of the Korean Chemical Society

Ka Young Kim¹ 

[1] Department of Chemistry and Research Institute of Natural Sciences Gyeongsang National University Jinju 52828 Korea

关键词: Cobalt complex;    Helicity;    Supramolecular polymer;   

DOI  :  10.1002/bkcs.11540

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

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.

【 授权许可】

Unknown