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Molecules with Multiple Chiral Centers02:25

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Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
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Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
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    Area of Science:

    • Supramolecular chemistry
    • Materials science
    • Chirality studies

    Background:

    • Controlling supramolecular chirality is key for developing advanced functional chiral materials.
    • Multifunctional materials require precise control over molecular self-assembly and nanoscale structures.

    Purpose of the Study:

    • To investigate the modulation of supramolecular chirality in nanotwists using various external stimuli.
    • To explore the role of solvents, temperature, and ultrasound in controlling the self-assembly of chiral nanostructures.
    • To provide a simple and rational design strategy for multistimuli-responsive chiral materials.

    Main Methods:

    • Self-assembly of nanotwists based on 1,4-phenyldicarboxamide with helicogenic alanine motifs.
    • Modulation of supramolecular chirality using solvent polarity, temperature variations, and ultrasonic treatment.
    • Characterization of self-assembled nanostructures and their chiral properties.

    Main Results:

    • Supramolecular chirality of nanotwists was successfully modulated by solvent, temperature, and ultrasound.
    • Hydrogen bonding and solvent-gelator interactions were identified as key mechanisms driving structural changes.
    • The gel system in ethyl acetate exhibited thixotropic behavior due to solvent participation in self-assembly.

    Conclusions:

    • A straightforward method for controlling the handedness of chiral nanostructures was demonstrated.
    • The study offers a rational design approach for self-assembly systems exhibiting multistimuli-responsive supramolecular chirality.
    • The findings pave the way for creating novel functional chiral materials with tunable properties.