Chiral Nanostructures from Artificial Helical Polymers: Recent Advances in Synthesis, Regulation, and Functions

ACS Nano, Journal Year: 2025, Volume and Issue: 19(1), P. 229 - 280

Published: Jan. 4, 2025

Helical structures such as right-handed double helix for DNA and left-handed α-helix proteins in biological systems are inherently chiral. Importantly, chirality at the nanoscopic level plays a vital role their macroscopic chiral functionalities. In order to mimic functions of natural nanoarchitectures, variety nanostructures obtained from artificial helical polymers prepared, which can be directly observed by atomic force microscopy (AFM), scanning tunneling (STM), electron (SEM), transmission (TEM). This review mainly focuses on formation morphology regulation triggered polymer chain length, concentration, solvent, temperature, photoirradiation, chemical additives. addition, distinct including recognition, circularly polarized luminescence, drug release, cell imaging, antibiosis also discussed.

Language: Английский

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Postpolymerization Modification-Induced Chiral Self-Assembly of Substituted Poly(phenylacetylene)s Based on Cis–Transoid to Cis–Cisoid Helical Transition

Macromolecules, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 19, 2025

Herein, we developed a novel postpolymerization modification-induced self-assembly (PPMISA) by subtly combining conformational transition-induced with an activated ester-amine reaction. During the reaction, poly(phenylacetylene) (PPA) backbone can spontaneously transform from cis–transiod to cis–cisoid helix, which reduces solubility and thus triggers in situ self-assembly, accompanied naked-eye solution color change turn-on fluorescence. PPMISA, structures gradually evolve slender fibers twisted suprahelical strands, screw sense of is strictly correlated helicity polyene backbone. The morphology chemical structure substituted PPA during PPMISA be readily tuned varying solvent, reaction time, variety organic amines. Compared inefficient conventional dilute these assemblies efficiently prepared at high solid concentrations (10 wt %) maintain their morphologies using mild conditions. Moreover, obtained present strong circularly polarized luminescence dissymmetry factor up order 1 × 10–2. This strategy may open new avenue fabricate structurally diverse functional nanomaterials.

Language: Английский

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Optical and Chiroptical Stimuli-Responsive Chiral AgNPs@H-Leu-Poly(phenylacetylene) Nanocomposites in Water

ACS Nano, Journal Year: 2024, Volume and Issue: 18(42), P. 28822 - 28833

Published: Oct. 9, 2024

Dynamic macroscopically chiral nanocomposites are prepared by combining silver nanoparticles (AgNPs) and dynamic helical poly(phenylacetylene)s (PPAs) bearing pendants functionalized with amino groups. These groups provide the nanocomposite ability to disperse in water along high stability due interaction between ammonium group AgNP. Moreover, equilibrium NH

Language: Английский

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Magnetically Separable Chiral Poly(ionic Liquid) Microcapsules Prepared Using Oil-in-Oil Emulsions

Polymers, Journal Year: 2024, Volume and Issue: 16(19), P. 2728 - 2728

Published: Sept. 26, 2024

This article presents a method for producing chiral ionic liquid-based polyurea microcapsules that can be magnetically separated. The involves entrapping hydrophilic magnetic nanoparticles within microspheres. synthetic process creating these particles oil-in-oil (o/o) nano-emulsification of an liquid-modified magnetite nanoparticle (MNPs-IL) and diamine monomer, which comprises bis(mandelato)borate anion, in nonpolar organic solvent, toluene, contains suitable surfactant. is followed by interfacial polycondensation reaction between the isocyanate polymethylenepolyphenyl (PAPI 27), generates containing their cores. generated from are then utilized to selectively adsorb either R or S enantiomer tryptophan (Trp) racemic mixture dissolved water, order evaluate recognition capabilities. During experiments, separable poly(ionic liquid) microcapsules, incorporated isomer bis(mandelato)borate, exhibited exceptional enantioselective adsorption performance. Thus, polymeric embedded with R-isomer anion demonstrated significant selectivity adsorbing L-Trp, yielding 70% enantiomeric excess after 96 h. In contrast, S-isomer preferentially adsorbed D-Trp, achieving 73% 48

Language: Английский

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Consecutive Complex Aggregation Pathway in Covalent Helical Polymer‐Metal Complexes: Nanospheres with Controlled P/M Macroscopic Chirality

Small, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 29, 2024

Abstract Kinetically trapped and thermodynamic nanospheres with opposite macroscopic P / M chirality circularly polarized luminescence (CPL) can be obtained from a single helical polymer‐metal complex under the same environmental conditions. To prepare these nanospheres, chiral poly(diphenylacetylene) (PDPA) [poly‐( L )‐ 1 ] large energy barrier between senses is chosen as source of chirality, while Ba 2+ metal ions are selected crosslinking agents. As result, poly‐( /Ba generate both kinetically (Agg 1, nanospheres) 2, aggregates, which dispersed in solvent. Due to high helix inversion process for complete evolution aggregate one takes more than 75 days at room temperature, accelerated higher temperatures. These stable remain solution up 8 months without further aggregation.

Language: Английский

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