Nano Research, Journal Year: 2024, Volume and Issue: 17(6), P. 5726 - 5734
Published: March 9, 2024
Language: Английский
Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: unknown
Published: April 12, 2024
Unraveling the mechanism of chirality transfer across length scales is crucial to rational development functional materials with hierarchical chirality. The key obstacle lack structural information, especially at mesoscopic level. We report herein identification helical covalent organic frameworks (heliCOFs) chirality, which integrate molecular channel and morphology into one crystalline entity. Specifically, benefiting from highly ordered structure heliCOFs, existence chiral channels level has been confirmed by electron crystallography, handedness these directly determined through stereopair imaging technique. Accordingly, in heliCOFs microscopic macroscopic levels could be rationalized a layer-rotating model that supported both crystal analysis theoretical calculations. Observation not only provides unprecedented data for understanding process but also sheds new light on construction polymeric
Language: Английский
Citations
8
Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 63(3)
Published: Nov. 28, 2023
Abstract The diversification of chirality in covalent organic frameworks (COFs) holds immense promise for expanding their properties and functionality. Herein, we introduce an innovative approach imparting helical to COFs fabricating a family chiral COF nanotubes with mesoscopic helicity from entirely achiral building blocks the first time. We present effective 2,3‐diaminopyridine‐mediated supramolecular templating method, which facilitates prefabrication imine‐linked polymer using unprecedented symmetric monomers. Through meticulous optimization crystallization conditions, these are adeptly converted into boasting impressive surface areas, while well preserving morphology chiroptical properties. Furthermore, polymers or could be subtly transformed corresponding more stable functional β‐ketoenamine‐linked hydrazone‐linked transferred circular dichroism via monomer exchange. Notably, despite involvement bonding breakage reorganization, exchange processes overcome thermodynamic disadvantages, allowing perfectly preserved. This research highlights potential conferring favourable properties, providing novel insights development multifunctional field materials chemistry.
Language: Английский
Citations
16
Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: unknown
Published: July 17, 2024
Abstract Herein we report on circularly polarized luminescence (CPL) emission originating from supramolecular chirality of organic microcrystals with a | g lum value up to 0.11. The were prepared highly emissive difluoroboron β‐diketonate (BF 2 dbk) dyes R ‐ 1 or S chiral binaphthol (BINOL) skeletons. and exhibit undetectable CPL signals in solution but manifest intense their microcrystals. superstructures induced by BINOL skeletons confirmed single‐crystal XRD analysis. Spectral analysis theoretical calculations indicate that intermolecular electronic coupling, mediated the asymmetric stacking superstructures, effectively alters excited‐state structures facilitates electron transitions perpendicular BF bdk planes. coupling increases cos θ μ , m 0.05 (monomer) 0.86 (tetramer) triggers optical activity bdk. results demonstrate chromophores within assemblies can be regulated both orientation extent couplings.
Language: Английский
Citations
6
Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(50)
Published: Aug. 28, 2024
Abstract Exploring self‐standing chiral covalent organic framework (COF) thin films with controllable circularly polarized luminescence (CPL) is of paramount significance but remains a challenging task. Herein, we demonstrate the first example COF employing polymerization‐dispersion‐filtration strategy. Pristine, low‐quality were produced by interfacial polymerization and then re‐dispersed into colloidal solutions. Via vacuum assisted assembly, these colloids densely stacked assembled self‐standing, pure ( L‐ / D‐ CCOF‐F) that transparent, smooth, crack‐free highly crystalline. These tunable in thicknesses, areas, roughness, along strong diffuse reflectance circular dichroism (DRCD) cyan CPL signals, showing an intrinsic asymmetric factor g lum ) ~4.3×10 −3 . Furthermore, served as host adsorbents to load various achiral dye guests through adsorption. The effective transfer energy between CCOF‐F fluorescent dyes endowed chirality DRCD, resulting intense, full‐color‐tunable solid‐state CPL. Notably, ordered arrangement guest molecules within preferentially oriented pores contributed amplified | up 7.2×10 −2 , which state‐of‐the‐art for COF‐based materials. This work provides new insights design fabrication films, demonstrating their great potential chiroptical applications.
Language: Английский
Citations
5
Advanced Materials, Journal Year: 2024, Volume and Issue: unknown
Published: Dec. 30, 2024
Asymmetric catalysis is essential for addressing the increasing demand enantiopure compounds. Recent advances in reticular chemistry have demonstrated that metal-organic frameworks (MOFs) and covalent organic (COFs) possess highly regular porous architectures, exceptional tunability, ability to incorporate chiral functionalities through their open channels or cavities. These characteristics make them effective enantioselective catalysts a wide range of asymmetric transformations. The microenvironments within these facilitate precise control over reactant orientation transition states, enhancing both catalytic activity enantioselectivity, thereby offering significant advantages traditional systems. This review overviews recent developments MOFs (CMOFs) COFs (CCOFs), focusing on design strategies, synthetic methods, highlights structure-property relationships connect key structural features performance. Additionally, current challenges future prospects this field are addressed, highlighting pivotal role creation materials. It anticipated will inspire further research into application crystalline materials promote rational novel heterogeneous industrial use.
Language: Английский
Citations
5
Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 64(1)
Published: Sept. 27, 2024
Abstract Exploring new strategies for construction of chiral covalent organic frameworks (COFs) is paramount importance yet remains a challenge. Herein, we report the rational design and COFs through linker decomposition induction (LDCI) strategy. Three pairs azine‐linked are successfully synthesized by condensation reactions C 3 ‐symmetric 4,4′,4′′‐(1,3,5‐triazine‐2,4,6‐triyl)tribenzaldehyde (Tz) with flexible dihydrazide linkers derived from malic acid, aspartic acid tartaric respectively. Remarkably, upon complete or partial dihydrazides to hydrazine during COF synthesis, homochirality these COFs, originating single‐handedness conformation propeller‐like Tz cores, well preserved. Such stereoselective memory realized via LDCI strategy confirmed time‐dependent powder X‐ray diffraction (PXRD), Fourier transform infrared (FT‐IR) diffuse reflectance circular dichroism (DRCD). Moreover, resultant used as active materials fabricate photodetectors directly distinguish circularly polarized light (CPL), showing impressive recognition performances on identification left‐handed (LHC) right‐handed (RHC) lights. Notably, residual undecomposed within found be conducive improving polarization discrimination ratio. This work highlights effective constructing homochiral promising future in optical application.
Language: Английский
Citations
4
Science China Chemistry, Journal Year: 2025, Volume and Issue: unknown
Published: Jan. 3, 2025
Language: Английский
Citations
0
Journal of Separation Science, Journal Year: 2025, Volume and Issue: 48(2)
Published: Feb. 1, 2025
ABSTRACT Chiral covalent organic frameworks (CCOFs) are emerging porous materials with tunable chiral structures, abundant pores, and high surface areas, gaining significant attentions in separation, sensing, asymmetric catalysis. This review summarizes the synthesis methods of CCOFs their applications recognition. It discusses advantages limitations three strategies, including post‐modification, direct synthesis, chiral‐induced synthesis. The also highlights potential catalysis for efficient purification, detection, molecules. Challenges future directions preparation application addressed, aiming to guide further research practical applications.
Language: Английский
Citations
0
Advanced Science, Journal Year: 2025, Volume and Issue: unknown
Published: April 27, 2025
Abstract Covalent organic frameworks (COFs), characterized by their unique ordered pore structures, chemical diversity, and high degree of designability, have demonstrated immense application potential across multiple fields. However, traditional synthesis methods often encounter challenges such as low crystallinity uneven morphology. The introduction surfactants has opened up new pathways for the COFs. Leveraging intermolecular interactions self‐assembly properties, can effectively regulate nucleation, growth processes, ultimate structure properties This paper systematically reviews latest research achievements future trends in surfactant‐assisted COF synthesis, emphasizing crucial role key additives preparation Surfactants not only facilitate uniform nucleation COFs, enhancing structural order products but also enable precise diverse regulation dimensionality, morphology, Furthermore, influencing dispersion processability enhance practicality workability. Finally, presents some prospects opportunities this emerging area.
Language: Английский
Citations
0
Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 163613 - 163613
Published: May 1, 2025
Language: Английский
Citations
0