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Reversibly Thermochromic Cyclic Dipeptide Nanotubes.

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    This summary is machine-generated.

    Cyclic dipeptides (CDPs) functionalized with diacetylene (DA) form stable nanotubes. These novel CDP-DA/polydiacetylene (PDA) nanotubes exhibit reversible thermochromism, paving the way for smart materials.

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    Area of Science:

    • Supramolecular Chemistry
    • Materials Science
    • Polymer Chemistry

    Background:

    • Cyclic dipeptides (CDPs) are versatile scaffolds for supramolecular structures due to hydrogen bonding and chirality.
    • Diacetylene (DA) moieties are photopolymerizable and known for colorimetric responses.

    Purpose of the Study:

    • To synthesize and characterize novel cyclic dipeptide-diacetylene (CDP-DA) conjugates.
    • To investigate the self-assembly behavior and structural properties of CDP-DA conjugates.
    • To explore the photopolymerization and thermochromic properties of the resulting supramolecular structures.

    Main Methods:

    • Synthesis of CDP-DA conjugates by coupling 10,12-pentacosadiynoic acid with CDPs (cyclo(-Gly-Ser) and cyclo(-Ser-Ser)).
    • Fabrication of nanotubular structures using a chloroform/methanol solvent mixture.
    • Morphological characterization via scanning electron microscopy (SEM) and transmission electron microscopy (TEM).
    • Structural analysis using X-ray diffraction (XRD).
    • Photopolymerization induced by UV irradiation.
    • Thermal cycling to assess thermochromic reversibility.

    Main Results:

    • CDP-DA conjugates self-assembled into single-wall and multiwall nanotubes.
    • XRD confirmed well-ordered lamellar structures consistent with bilayer formation and lamellar scrolling.
    • UV irradiation of CDP-DA nanotubes yielded blue CDP/polydiacetylene (PDA) nanotubes.
    • CDP/PDA nanotubes demonstrated reversible blue-to-red color changes over 10 thermal cycles.

    Conclusions:

    • CDP-DA conjugates can form stable, well-ordered nanotubular supramolecular architectures.
    • The resulting CDP/PDA nanotubes exhibit significant reversible thermochromism.
    • This CDP-DA/PDA system holds promise for developing advanced stimulus-responsive functional materials.