Construction of a carboxyl-functionalized clover-like covalent organic framework for selective adsorption of organic dyes

Separation and Purification Technology, Год журнала: 2024, Номер 340, С. 126765 - 126765

Опубликована: Фев. 12, 2024

Язык: Английский

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Defects and Disorder in Covalent Organic Frameworks for Advanced Applications

Advanced Functional Materials, Год журнала: 2023, Номер 34(18)

Опубликована: Дек. 24, 2023

Abstract Crystalline porous organic polymers (CPPs) or covalent frameworks (COFs), are composed by light elements linked bonds. Despite the remarkable progress attained, there still bottlenecks limiting further development, some of them related to presence defects during their synthesis as well in‐depth understanding structure active centers and/or details reaction mechanism. Indeed, very often proposed structures far from reality because and disorders have not been considered. The present review provides an illustrative overview “defects disorder in COFs”. These include those only generated manipulation COFs, but also lack crystallinity, stacking network vacancies. starts giving general remarks on COFs synthetic methods, followed different methods play manage defects, how minimize take advantage gain new properties applications. Selected characterization techniques quantify defective sites presented. Finally, challenges future opportunities field summarized last section.

Язык: Английский

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Integrated High Voltage, Large Capacity, and Long‐Time Cyclic Stability of Lithium Organic Battery Based on a Bipolar‐Type Cathode of Triphenylamine‐Hydrazone COF Material

Advanced Functional Materials, Год журнала: 2023, Номер 34(14)

Опубликована: Дек. 22, 2023

Abstract Covalent organic frameworks (COFs) are a promising class of electrode materials for lithium‐ion batteries. However, the reported cathodes COFs typically exhibit low potential and voltage plateaus, which limits their further applications. In this work, new hydrazone three‐dimensional (3D) COF material with bipolar characteristics, PTB‐DHZ‐COF, is constructed by Schiff base condensation monomeric PTB DHZ. The cell PTB‐DHZ‐COF as cathode exhibits wide range 1.2–4.2 V discharge plateau over 3.6 V. PTB‐DHZ‐COFX composites successfully prepared compounding carbon nanotubes. PTB‐DHZ‐COF40 cells show high specific capacity (114.24 mAh·g −1 at 1000 mA·g ), excellent cycling capability (86.3% retention after 5000 cycles), ultra‐high energy density (489 Wh·kg 50 ). This work provides strategy design development high‐performance storage electrodes.

Язык: Английский

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Self‐Standing Chiral Covalent Organic Framework Thin Films with Full‐Color Tunable Guest‐Induced Circularly Polarized Luminescence

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(50)

Опубликована: Авг. 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.

Язык: Английский

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2.5-dimensional covalent organic frameworks

Nature Communications, Год журнала: 2025, Номер 16(1)

Опубликована: Янв. 2, 2025

Abstract Covalently bonded crystalline substances with micropores have broad applications. Covalent organic frameworks (COFs) are representative of such substances. They so far been classified into two-dimensional (2D) and three-dimensional (3D) COFs. 2D-COFs planar shapes useful for purposes, but obtaining good crystals sizes larger than 10 μm is significantly challenging, whereas yielding 3D-COFs high crystallinity easier. Here, we show COFs 2.5-dimensional (2.5D) skeletons, which microscopically constructed 3D bonds macroscopically 2D shapes. The 2.5D-COFs shown herein achieve large single-crystal above 0.1 mm ultrahigh-density primary amines regularly allocated on pointing perpendicular to the covalently-bonded network plane. Owing latter nature, promising as CO 2 adsorbents that can simultaneously /N selectivity low heat adsorption, usually in a mutually exclusive relationship. expected broaden frontier application covalently microporous systems.

Язык: Английский

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Construction of dual-chiral covalent organic frameworks for enantioselective separation

Journal of Chromatography A, Год журнала: 2024, Номер 1728, С. 465014 - 465014

Опубликована: Май 21, 2024

Язык: Английский

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Construction of Chiral Covalent Organic Frameworks Through a Linker Decomposition Chiral Induction Strategy for Circularly Polarized Light Detection

Angewandte Chemie International Edition, Год журнала: 2024, Номер 64(1)

Опубликована: Сен. 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.

Язык: Английский

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Tuning the Topology of Two‐Dimensional Covalent Organic Frameworks through Site‐Selective Synthetic Strategy

Chemistry - A European Journal, Год журнала: 2024, Номер 30(14)

Опубликована: Янв. 10, 2024

Abstract Tuning the topology of two‐dimensional (2D) covalent organic frameworks (COFs) is paramount scientific interest but remains largely unexplored. Herein, we present a site‐selective synthetic strategy that enables tuning 2D COF by simply adjusting molar ratio an amine‐functionalized dihydrazide monomer (NH 2 −Ah) and 4,4′,4′′‐(1,3,5‐triazine‐2,4,6‐triyl)tribenzaldehyde (Tz). This approach resulted in formation two distinct COFs: clover‐like with free amine groups −Ah−Tz) honeycomb‐like without (Ah−Tz). Both COFs exhibited good crystallinity moderate porosity. Remarkably, clover‐shaped NH −Ah−Tz COF, abundant groups, displayed significantly enhanced adsorption capacities toward crystal violet (CV, 261 mg/g) congo red (CR, 1560 compared to non‐functionalized Ah−Tz (123 mg/g for CV 1340 CR), underscoring pivotal role functional enhancing dyes. work highlights paves new avenue manipulating feeding ratio, thereby modulating their performances

Язык: Английский

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Primary Amine-Functionalized Chiral Covalent Organic Framework Enables High-Efficiency Asymmetric Catalysis in Water

ACS Applied Materials & Interfaces, Год журнала: 2024, Номер 16(43), С. 59379 - 59387

Опубликована: Окт. 17, 2024

Aqueous asymmetric catalysis using chiral covalent organic frameworks (COFs) represents a significant advancement but remains to be explored. Herein, we present the first example of aqueous catalyzed by primary amine-tagged D-ADP-TAPB COF. The COF was synthesized postsynthetic deprotection D-ADP-TAPB-Boc bearing protective tert-butoxycarbonyl (Boc) group, which constructed Schiff-base reaction between an alanine-derived building block (D-ADP-Boc) and 1,3,5-tris(4-aminophenyl)benzene (TAPB). crystalline exhibits uniform, spherical morphology with abundant, well-distributed amines, rendering it highly active in aldol cyclohexanone 4-nitrobenzaldehyde. Notably, this is conducted entirely water, achieving impressive yields enantiomeric excess (ee) values up 90 85%, respectively. To best our knowledge, catalyst high reactivity enantioselectivity for solely eliminating need conventional solvents. Moreover, plausible mechanism COF-mediated reactions elucidated. This work not only expands toolbox designing rare amine-functionalized COFs also opens exciting avenues developing green water-based enantioselective catalysis.

Язык: Английский

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Proportionally Controlled Dual-Chiral Covalent Organic Frameworks via Thiol-Ene Click Reaction for Efficient Enantioseparation

Talanta, Год журнала: 2024, Номер 283, С. 127128 - 127128

Опубликована: Ноя. 1, 2024

Язык: Английский

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