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Inorganics 2018, 6(3), 80;

Dynamic Helicity Control of Oligo(salamo)-Based Metal Helicates

Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa 920-1192, Japan
Nano Life Science Institute, Kanazawa University, Kanazawa 920-1192, Japan
Received: 5 July 2018 / Revised: 10 August 2018 / Accepted: 10 August 2018 / Published: 17 August 2018
(This article belongs to the Special Issue Chiral Metal Complexes)
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Much attention has recently focused on helical structures that can change their helicity in response to external stimuli. The requirements for the invertible helical structures are a dynamic feature and well-defined structures. In this context, helical metal complexes with a labile coordination sphere have a great advantage. There are several types of dynamic helicity controls, including the responsive helicity inversion. In this review article, dynamic helical structures based on oligo(salamo) metal complexes are described as one of the possible designs. The introduction of chiral carboxylate ions into Zn3La tetranuclear structures as an additive is effective to control the P/M ratio of the helix. The dynamic helicity inversion can be achieved by chemical modification, such as protonation/deprotonation or desilylation with fluoride ion. When (S)-2-hydroxypropyl groups are introduced into the oligo(salamo) ligand, the helicity of the resultant complexes is sensitively influenced by the metal ions. The replacement of the metal ions based on the affinity trend resulted in a sequential multistep helicity inversion. Chiral salen derivatives are also effective to bias the helicity; by incorporating the gauche/anti transformation of a 1,2-disubstituted ethylene unit, a fully predictable helicity inversion system was achieved, in which the helicity can be controlled by the molecular lengths of the diammonium guests. View Full-Text
Keywords: helical structure; dynamic structure conversion; responsive molecule; metal complex; salen ligand; helicity control; helicity inversion; chirality switch helical structure; dynamic structure conversion; responsive molecule; metal complex; salen ligand; helicity control; helicity inversion; chirality switch

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Akine, S. Dynamic Helicity Control of Oligo(salamo)-Based Metal Helicates. Inorganics 2018, 6, 80.

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