Construction of a Spherical Chiral Covalent Organic Framework for Efficient Asymmetric Aldol Catalysis

Journal of Solid State Chemistry, Journal Year: 2025, Volume and Issue: unknown, P. 125350 - 125350

Published: April 1, 2025

Language: Английский

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Recent Advance in the Synthesis and Applications of Chiral Covalent Organic Frameworks: A Mini‐Review

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

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Chiral Cross-Linked Covalent Organic Framework Films for Highly Sensitive Circularly Polarized Luminescence Probing

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: March 3, 2025

The development of covalent organic framework (COF) films featuring circular polarization luminescence (CPL) probing remains a formidable challenge. Herein, we developed chiral cross-linked COF film to obtain uniform and dense (chirCOFilm) possessing highly sensitive CPL for enantiomers. axial cross-linkers (R-/S-BBNA) are initially introduced into the channels (COFilm/R-BBNA or COFilm/S-BBNA) by vapor-assisted epitaxial method. Then, olefin groups in R-/S-BBNA layers undergo cross-linking reaction under UV irradiation, forming chirCOFilm. obtained chirCOFilms have strong chirality with mirror images, fluorescence discoloration, intense properties. A multitude rich photopatterns chirCOFilm/PDMS flexible prepared taking advantage photochromic properties during illumination, showing potential application advanced anticounterfeiting. More importantly, realize phenethylamine enantiomers at 5% concentration, which can hardly be achieved from their corresponding probing. This study not only provides new strategy preparing using but also opens avenue achieving though CPL.

Language: Английский

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Creating Sodium Ion Channels via De Novo Encapsulation of Ionophores for Enhanced Water Energy Harvesting

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 30, 2025

Abstract Biological ion channels achieve remarkable permselectivity and cation discrimination through the synergy of their intricate architectures specialized ionophores within confined nanospaces, enabling efficient energy conversion. Emulating such selectivity in synthetic nanochannels, however, remains a persistent challenge. To address this, novel host‐guest assembly membrane is developed by incorporating sodium‐selective into β‐ketoenamine‐linked covalent organic framework (COF). This design confers exceptional Na + selectivity, achieving /K /Li ratios 3.6 103, respectively, along with near‐perfect /Cl − under 0.5 M || 0.01 salinity gradient. Notably, dynamically switches its to favor anion transport presence high‐valent cations (e.g., Ca 2+ ), overcoming limitations as uphill diffusion back currents observed conventional cation‐selective membranes. adaptive behavior yields 4.6‐fold increase output power density ‐rich environments. These findings advance biomimetic nanochannels unparalleled enhanced conversion efficiency.

Language: Английский

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Dimensionality control of chiral covalent organic frameworks for enhanced asymmetric catalysis

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 163613 - 163613

Published: May 1, 2025

Language: Английский

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Homochiral versus Racemic 2D Covalent Organic Frameworks

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: May 15, 2025

The synthesis of homochiral two-dimensional covalent organic frameworks (2D COFs) from chiral π-conjugated building blocks is challenging, as units often lead to misaligned stacking interactions. In this work, we introduce helical chirality into 2D COFs using configurationally stable enantiopure and racemic [5]helicenes linkers in the backbone [5]HeliCOFs powders films. Through condensation with 1,3,5-triformylbenzene (TFB) or 1,3,5-triformylphloroglucinol (TFP), our approach enables efficient formation a set [5]HeliCOFs. resulting carbon-based crystalline porous exhibit distinct structural features different properties between counterparts. Propagation leads observation advanced chiroptical far-red visible spectrum, along less compact structure compared frameworks. Homogeneous thin films disclosed photoluminescent arising controlled growth highly ordered lattices. present study offers insight general framework extends Liebisch-Wallach rule COFs.

Language: Английский

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Preparation and Resolution Performances of Chiral Stationary Phases Based on Spherical Covalent Organic Frameworks with Various Zeta Potentials

Journal of Chromatography A, Journal Year: 2025, Volume and Issue: unknown, P. 466087 - 466087

Published: May 1, 2025

Language: Английский

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