Hierarchical chirality conversion switched by biaxial halogen bonding

Chemical Science, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Precise control over chirality across hierarchical levels of peptides enriches the toolbox peptide-based chiroptical materials. In this work, we report a controlled conversion from folded molecular to supramolecular chirality, which can be effectively switched by biaxial halogen bonds. Amino acid segments were conjugated bipyridine core as β-turn facilitate formation parallel β-sheet arrays, enables intramolecular transfer appended pyrenes. This allows for efficient excimer emission and boosted circularly polarized luminescence with dissymmetry factor up 10-2. The folding structures are self-assembled into nanohelices where is dominated emerged heterochirality in response solvent medium. introduction hypervalent iodine(iii) species binds peptide via strong I⋯N bonds that transform well-ordered helices amorphous nanoparticles. bonding complexation rearranges assembly extremely high efficacy, suppressing recovering when activities rationally manipulated. work unveils dynamic artificially peptides, will inspire design protocols peptide- or protein-based

Language: Английский

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Responsive Chirality: Tailoring Supramolecular Assemblies with External Stimuli as Future Platforms for Electronic/ Spintronic Materials

Chemistry - A European Journal, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 27, 2024

Abstract Supramolecular chirality is the major branch of supramolecular chemistry, which not only plays important roles in biological processes but also synthetically designed aggregated systems. To understand complex processing systems, way to design chiral ensembles that mimic natural biomolecules such as Deoxyribonucleic acid (DNA), Ribonucleic (RNA), amino acids, etc. In addition, systems and self‐assemblies molecular motifs with breaking spatial inversion symmetry have been regarded key substances electronics spintronics well fundamental chemistry physics. Here, this review, our concern understanding modulation arrangements packing modes under impact any external stimuli, results tailoring handedness resulted superstructures. We, highlighted role stimuli solvent, chemical additives, photo exposure, altering for their future utility “active switches” optoelectronic spintronic devices applications.

Language: Английский

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Supramolecular systems and their connection with metal–organic structures

Frontiers in Chemistry, Journal Year: 2024, Volume and Issue: 12

Published: Nov. 5, 2024

Supramolecular structures with specific applications are a pillar in several areas of science. Thus, from contemporary point view, there reasons to embrace systematic order the supramolecular concept itself. First, structuring material seems safer now than it did decades ago. Second, interactions metal–organic frameworks (MOFs) and chemistry and, conversely, supramolecularity assemble MOFs create efficient complex systems multiple cutting-edge an image be safeguarded. Third, perhaps we should simply limit ourselves considering how researchers these fields have attempted correlate notion by linking self-assembly considerations. In any case, topics present advantages optimize innovative geometries that useful highlight significant practical applications. This review covers general introduction supramolecularity, key unit study presented here, followed survey recent advances confined space chemistry, relationships structures, synthesis electrochemistry switchable obtain greater understanding structure–property relationships. To conclude, some future perspectives on this promising plausible field science will mentioned.

Language: Английский

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Oxidation Triggered Supramolecular Chirality

Nano Letters, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 9, 2024

Topochemical reactions normally occurring in the solid and crystalline state exhibit solvent-free catalyst-free properties, with high atom economy which have been widely applied materials science polymer synthesis. Herein, we explore potential of topochemical for controlling emergence supramolecular chirality precise fabrication chiroptical materials. Boronic acid pinacol esters (BPin) were conjugated to naphthalimides containing an inherent chiral cholesteryl group linked by alkyl or benzene spacers. The BPin segments oxidized H2O2 form hydroxyl groups, enhanced luminescence, reduced steric effects, increased amphiphilicity. liposomal aggregates underwent situ oxidation transformed into 1D nanoarchitectures, exhibiting macroscopic chirality, active Cotton circularly polarized luminescence. Oxidation could also initiate intimate interplay between building units guest molecule, evolution multiple component assembly system realized.

Language: Английский

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