Chemical Science, Год журнала: 2025, Номер unknown
Опубликована: Янв. 1, 2025
Full-color CPL composite films prepared using helical polymers, fluorescein and substrates have excellent mechanical processing properties. They exhibit matrix universality, low cost, multi-stimulus responsiveness to UV, heat, acid/base.
Язык: Английский
Advanced Optical Materials, Год журнала: 2024, Номер 12(19)
Опубликована: Апрель 9, 2024
Abstract Photochromic circularly polarized luminescence (CPL) demonstrates broad application prospects in the field of advanced functional materials. However, current photochromic CPL focuses predominantly on single‐band adjustment, and how to achieve dynamically tunable multi‐band is still highly challenging. This work reports success utilizing reversible photochromism for realizing full‐color emission. flexible films are created consisting triple components: spiropyran (SP) working as matter, polyurethane (PU) matrix, chiral helical polyacetylene component. Further introducing blue fluorophore 9‐anthracene carboxylic acid (ACA) film, red emitted respectively through selective absorption/transmission fluorescence energy transfer (CPF‐ET). Doping film with diverse fluorophores provides Adding Zn 2+ further intensifies via forming merocyanine (MC)‐Zn complex. Taking advantage emission, anti‐counterfeiting, secondary encryption resulting materials demonstrated.
Язык: Английский
Процитировано
9
Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(22)
Опубликована: Март 20, 2024
Abstract Optically active π‐conjugated polymers (OACPs) have garnered increasing research interest for their resemblance to biological helices and intriguing chirality‐related functions. Traditional methods synthesizing involve decorating achiral conjugated polymer architectures with enantiopure side substituents through complex organic synthesis. Here, we report a new approach: the templated synthesis of unsubstituted OACPs via supramolecularly confined polymerizations monomers within nanopores 2D or 3D chiral covalent frameworks (CCOFs). We show that π‐rich nanospaces facilitate in situ enantiospecific polymerization self‐propagation, akin nonenzymatic polymerase chain reaction (PCR) system, resulting imprinting. The stacked chains are kinetically inert enough memorize information after liberating from CCOFs, even treatment at temperature up 200 °C. isolated demonstrate robust enantiodiscrimination, achieving 85 % ee separating racemic amino acids. This underscores potential utilizing CCOFs as templates imprinting optical activity into CPs, paving way synthetic evolution advanced functional exploration OACPs.
Язык: Английский
Процитировано
7
ACS Applied Materials & Interfaces, Год журнала: 2024, Номер 16(20), С. 26604 - 26612
Опубликована: Май 9, 2024
One of the most important factors for future application circularly polarized luminescence (CPL) materials is their high dissymmetry (gem), and more studies are working tirelessly to focus on increasing gem value. Herein, we chose an achiral liquid crystal polymer (LC-P) two chiral binaphthyl-based inducers (R/S-3 R/S-6) with different substitution positions (3,3' R/S-3 6,6' construct co-assemblies explored induced amplification CPL behaviors. Interestingly, after thermal annealing treatment, this kind co-assembly (R/S-3)0.05-(LC-P)0.95 can emit a superior signal (|gem| = 0.31 λem 424 nm), which achieves about 13-fold in spin-coated film, compared (R/S-6)0.1-(LC-P)0.9 0.023 nm). This because could further co-assemble form ordered arrangement LC state generate regular helix nanofibers than that (R/S-6)0.1-(LC-P)0.9. work provides efficient method synthesizing high-quality CPL-active through strategic manipulation structure co-assembled LCP systems.
Язык: Английский
Процитировано
6
Macromolecules, Год журнала: 2024, Номер 57(12), С. 5915 - 5928
Опубликована: Июнь 4, 2024
Stimuli-responsive helical polymers form an intriguing class of materials that may find broad applications in chiroptical or switchable chiral devices. Here we report the synthesis a dendronized copolymers with poly(phenylacetylene) (PPA) backbones. These carry methoxy-terminated dendritic oligoethylene glycol (OEG) pendants and spiropyran moieties. Both block random were prepared to investigate effect structure on their stimuli-responsiveness helicities, as well supramolecular assemblies aqueous conditions. The exhibited typical thermoresponsive behavior through thermal dehydration OEGs tunable cloud point temperatures (Tcps). Polarity differences between hydrophilic OEG lipophilic PPA backbones afforded all radial amphiphilicity. In addition, for copolymers, polarity SP further provided axial Their unprecedented amphiphilic nature drove preferentially aggregate water even below Tcps. On heating across Tcps, thermally induced phase transitions resulted switches helicity. Photoisomerization moieties closed spirocyclic (SP) open merocyanine (MC) within copolymer matrices was dependent balance interactions OEGs, which did not exhibit obvious influence helicities. Supramolecular assembly tend extremely long fibers thicknesses about 25 nm, while anisotropic nanocubes dimensions around 400–600 nm observed from indicating topology plays important role modulating assemblies.
Язык: Английский
Процитировано
6
ACS Applied Polymer Materials, Год журнала: 2024, Номер 6(5), С. 2504 - 2512
Опубликована: Фев. 27, 2024
A polymerization reaction in chiral liquid crystal produced electro-optically active polymers from achiral furan–thiophene-based monomers. The set of prepared this study had characteristics molecular order and organic semiconductors. optically aromatic copolymers were synthesized via an electrochemical method cholesteric crystals (Ch-LCs). Electrical properties chirality can be tuned to choose suitable monomer units. obtained evaluated by polarizing optical microscopy (POM), circular dichroism, UV–vis spectroscopy, cyclic voltammetry, reflectance scanning electron microscopy, transmission atomic force microscopy. POM observations the products showed a vortex-type fingerprint texture. Polymerization monomers containing only two sites resultant compounds with good transcription texture Ch-LC electrolyte solution. membrane-forming behavior improved introducing furans at edges absorption bands derived polarons bipolarons as charge carriers conducting electrical redox process hydrazine vaporization treatment. control for activity was achieved.
Язык: Английский
Процитировано
5
Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(32)
Опубликована: Май 14, 2024
Abstract Nanostructuration of dynamic helical polymers such as poly(phenylacetylene)s (PPAs) depends on the secondary structure adopted by polymer and functional group used to connect chiral pendant PPA backbone. Thus, while PPAs with flexible scaffolds ( para ‐ meta ‐substituted, ω 1 <165°) generate nanoprecipitation low polydisperse nanospheres controllable size at different acetone/water mixtures, those a quasi‐static behavior presence an extended, almost planar ortho‐ substituted, >165°), aggregate into mixture spherical oval nanostructures whose is not controlled. Photostability studies show that poly(phenylacetylene) particles are more stable light irradiation than when dissolved macromolecularly. Moreover, photostability particle its screw sense excess. This fact, in combination encapsulation ability these particles, allows creation stimuli‐responsive nanocarriers, cargo can be delivered irradiation.
Язык: Английский
Процитировано
5
ChemCatChem, Год журнала: 2024, Номер 16(16)
Опубликована: Март 7, 2024
Abstract As an excellent class of electrode materials, carbon‐based materials have garnered sustained attention. Constructing skeleton with unique structure has become a vital research area in the fields electrocatalysis. Recently, surface curvature been extensive discussed as compelling factor electronic modulation for electrocatalyst design. Benefitting from its distinctive regulation, intrinsic activity and service stability catalysts during electrocatalytic process can be significantly improved. Therefore, helical that adeptly integrates well‐regulated, highly ordered curvatures is considered to great value synthesis skeleton. In this Concept article, we systematically summarize up‐to‐date reports on synthetic methods skeletons structures present major challenges field. We also emphasize could combined transition metals cooperative coupling, potentially leading further development high‐efficiency electrocatalysts.
Язык: Английский
Процитировано
4
Chemistry - A European Journal, Год журнала: 2024, Номер 30(32)
Опубликована: Апрель 8, 2024
Abstract Nature owns the ability to construct structurally different polymers from same monomers. While can be classified as covalent ( CPs ) and supramolecular SPs ), it is still difficult synthesize using monomers like nature do. Herein, M1 with two diazo salts on both ends was designed. Additionally, hydroquinone chosen M2 for existence of hydroxyl groups. When mixing at room temperature, self‐assembled via N…H hydrogen bonds. In another way, upon exposure ultraviolet irradiation when blending , were fabricated in presence The excellent thermal stability determined by TGA DSC, while great corrosion resistance detected acid or alkali immersion. this constructing kinds successfully achieved. This shows tremendous potential fields polymer science, chemistry, which would boom development polymers.
Язык: Английский
Процитировано
4
ACS Macro Letters, Год журнала: 2024, Номер unknown, С. 227 - 233
Опубликована: Фев. 1, 2024
With the aim of broadening scope Janus-type polymers with new functionalities, miktoarm star copolymers comprising helical poly(phenyl isocyanide) (PPI) and a vinyl polymer were designed synthesized via combination Pd(II)-initiated isocyanide polymerization atom transfer radical (ATRP). A functional β-cyclodextrin bearing 7 Pd(II) complexes at one side 14 bromine groups other ((Pd(II))7-CD-(Br)14) was prepared used as an initiator for one-pot phenyl ATRP monomers in living controlled manner. variety different structures tunable compositions facilely obtained by using this method. Thus, composed PPIs tetraphenylethylene-modified exhibited significant circularly polarized luminescence performance both soluble aggregated states. Meanwhile, containing hydrophilic presented amphiphilicity self-assembled into diverse morphologies.
Язык: Английский
Процитировано
3
Angewandte Chemie, Год журнала: 2024, Номер 136(39)
Опубликована: Июнь 27, 2024
Abstract Porous frameworks with controlled pore structure and tunable aperture are greatly demanded. However, precise synthesis of this kind materials is a formidable challenge. Herein, we report the fabrication two‐dimensional (2D) supramolecular polymer using precisely synthesized rod‐like helical polyisocyanide as link. Four three‐arm star‐shaped polyisocyanides degree polymerization 10, 20, 30 40, having 2‐ureido‐4[1H]‐pyrimidinone (UPy) terminals were synthesized. 2D‐Crystalline apertures 5.3, 10.1, 13.9, 19.1 nm respectively obtained through intermolecular hydrogen bonding interaction between terminal Upy units. The dependent on length backbone. Thus, well‐defined uniform hexagonal pores obtained, proved by small‐angle X‐ray scattering (synchrotron radiation facility), atomic force microscopy, Brunauer–Emmett–Teller analyses. large used to purify nanomaterials immobilize biomacromolecules. For instance, membranes could size‐fractionation silver nanoparticles into very low dispersity. facilitated inclusion myoglobin enhanced stability catalytic activity.
Язык: Английский
Процитировано
3