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      Visualisation of helical structures of poly(diphenylacetylene)s bearing chiral amide pendants by atomic force microscopy

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          Abstract

          First direct structural characterization of single-handed helical poly(diphenylacetylene)s has been accomplished by high-resolution atomic force microscopy. The key structural details including helical pitch and handedness were revealed.

          Abstract

          The helical structures of poly(diphenylacetylene)s bearing optically active substituents linked through amide bonds and with a helicity memory have been visualised using atomic force microscopy. The polymers self-assembled into an ordered 2D monolayer on highly oriented pyrolytic graphite upon exposure to solvent vapour, whose helical pitch and handedness (right- and left-handed) were for the first time directly revealed at molecular resolution.

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          Helical polymers: synthesis, structures, and functions.

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            The Macromolecular Route to Chiral Amplification.

            Cooperative phenomena, described by one-dimensional statistical physical methods, are observed between the enantiomeric characteristics of monomeric materials and the polymers they produce. The effect of minute energies associated with this amplified chirality, although currently not interpretable, can be easily measured. Nonlinear relationships between enantiomeric excess or enantiomeric content and polymer properties may offer the possibility of developing chiral catalysts and chiral chromatographic materials in which the burden of large enantiomeric excess or content may be considerably alleviated. New approaches to information and sensor technology may become possible.
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              Supramolecular Helical Systems: Helical Assemblies of Small Molecules, Foldamers, and Polymers with Chiral Amplification and Their Functions.

              In this review, we describe the recent advances in supramolecular helical assemblies formed from chiral and achiral small molecules, oligomers (foldamers), and helical and nonhelical polymers from the viewpoints of their formations with unique chiral phenomena, such as amplification of chirality during the dynamic helically assembled processes, properties, and specific functionalities, some of which have not been observed in or achieved by biological systems. In addition, a brief historical overview of the helical assemblies of small molecules and remarkable progress in the synthesis of single-stranded and multistranded helical foldamers and polymers, their properties, structures, and functions, mainly since 2009, will also be described.
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                Author and article information

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                Journal
                CHCOFS
                Chemical Communications
                Chem. Commun.
                Royal Society of Chemistry (RSC)
                1359-7345
                1364-548X
                November 19 2021
                2021
                : 57
                : 92
                : 12266-12269
                Affiliations
                [1 ]WPI Nano Life Science Institute (WPI-NanoLSI), Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
                [2 ]Graduate School of Natural Science and Technology Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
                [3 ]Institute for Frontier Science Initiative, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
                Article
                10.1039/D1CC05341H
                b1a47864-9230-461a-817f-ae70993f19f3
                © 2021

                http://rsc.li/journals-terms-of-use

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                Self URI (article page): http://xlink.rsc.org/?DOI=D1CC05341H

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